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学者姓名：李立云
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Featured Application The purpose of this article is to explore the mechanical response characteristics and influencing factors of the structure inside the pit and the surrounding environment during the construction process.Abstract Relying on a foundation pit project leveraging the covered semi-top-down method with synchronous construction of the superstructure and substructure in Beijing, the whole process of construction was simulated by using ABAQUS finite-element software. The impact of the whole construction on the surrounding ground, the adjacent building, and the retaining structure were studied, and the influence of the existing building, the strength of diaphragm wall, and the construction process were carried out. As shown from the results, the foundation pit and the existing building are in a safe state during the whole construction process. The ground settlement shows an obvious groove shape. The deformation of the diaphragm wall has obvious spatial effects, which changes from "single peak" to "double peaks". The maximum horizontal displacement of strata behind the diaphragm wall occurs at a depth of 22.5 m, which is 1.4-2.0 times the top horizontal displacement. The presence of existing buildings reduced the ground settlement between the buildings and the excavation surface. The construction process has little impact on the settlement of adjacent existing buildings, which can be adjusted appropriately.
Keyword ：
covered semi-top-down method covered semi-top-down method numerical simulation numerical simulation deformation characteristics deformation characteristics synchronous construction of superstructure and substructure synchronous construction of superstructure and substructure
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| GB/T 7714 | Li, Liyun , Li, Zixuan , Lei, Ling et al. Case Study on Response Characteristic of Surroundings Induced by a Covered Semi-Top-Down Excavation with Synchronous Construction of the Superstructure and Substructure [J]. | APPLIED SCIENCES-BASEL , 2025 , 15 (5) . |
| MLA | Li, Liyun et al. "Case Study on Response Characteristic of Surroundings Induced by a Covered Semi-Top-Down Excavation with Synchronous Construction of the Superstructure and Substructure" . | APPLIED SCIENCES-BASEL 15 . 5 (2025) . |
| APA | Li, Liyun , Li, Zixuan , Lei, Ling , Li, Zhuyan , Jiang, Haonan , Gao, Yunhao . Case Study on Response Characteristic of Surroundings Induced by a Covered Semi-Top-Down Excavation with Synchronous Construction of the Superstructure and Substructure . | APPLIED SCIENCES-BASEL , 2025 , 15 (5) . |
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Abstract ：
Exploiting the linear Mohr-Coulomb strength criterion, the stability computation for earth retaining structures (ERSs) by estimating the active earth pressure has been mainly conducted by setting the plane strain 2D. In this research, the modified MC strength criterion with reduced tensile strength is put into use for the stability analysis of ERSs employing a 3D multi-cone collapse analysis mechanism. After computing the coefficient of active earth pressure, the optimal results are captured from a combination of the genetic algorithm and particle swarm optimization. Research findings are validated through comparison, while the influences of soil tensile strength threshold and 3D geometrical features over the stability measures and critical failure modes of ERSs are explored by parametric assessment. It is revealed in this work that the linear MC strength criterion derives conservative estimates of the active earth pressure. The tensile strength threshold of soil has a pronounced effect on both the objective solutions and failure shapes, especially for the ERSs under a greater dimensionless cohesion c/gamma H. This work provides a straightforward approach to perform a 3D stability analysis of ERSs considering a tensile strength cutoff, without a pre-assumed distribution of the rupture angle.
Keyword ：
Three-dimensional characteristics Three-dimensional characteristics Active earth pressure Active earth pressure Earth retaining structure Earth retaining structure Reduced tensile strength Reduced tensile strength
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| GB/T 7714 | Xu, Jingshu , Wang, Xinrui , Li, Liyun et al. Required Active Earth Pressure for 3D ERSs Following a Modified Mohr-Coulomb Strength Criterion [J]. | KSCE JOURNAL OF CIVIL ENGINEERING , 2024 , 28 (7) : 2639-2646 . |
| MLA | Xu, Jingshu et al. "Required Active Earth Pressure for 3D ERSs Following a Modified Mohr-Coulomb Strength Criterion" . | KSCE JOURNAL OF CIVIL ENGINEERING 28 . 7 (2024) : 2639-2646 . |
| APA | Xu, Jingshu , Wang, Xinrui , Li, Liyun , Du, Xiuli . Required Active Earth Pressure for 3D ERSs Following a Modified Mohr-Coulomb Strength Criterion . | KSCE JOURNAL OF CIVIL ENGINEERING , 2024 , 28 (7) , 2639-2646 . |
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Abstract ：
A data-driven indirect approach for predicting the response of existing structures induced by excavation is hereby proposed based on making full use of monitoring data during excavation, which can predict the deformation history of the research object during excavation. In this article, a machine-learning-based model framework for implementing the proposed approach is constructed and the treatment of key issues in the design and implementation of the proposed method is described in detail including the theoretical framework, the implementation mode of the method, the dimensionality reduction of the model parameters, and the normalization of data for model. On this basis, three models are provided to predict the settlement of buildings induced by adjacent excavation, namely the SVM model, BP model, and BP-SVM model. Relying on an excavation project for a subway in Xuzhou, Jiangsu Province, China, the proposed method is verified, and some conclusions are obtained.
Keyword ：
data-driven indirect approach data-driven indirect approach prediction model of response prediction model of response excavation excavation construction safety construction safety machine learning machine learning
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| GB/T 7714 | Li, Liyun , Sun, Qingxi , Wang, Yichen et al. A Data-Driven Indirect Approach for Predicting the Response of Existing Structures Induced by Adjacent Excavation [J]. | APPLIED SCIENCES-BASEL , 2023 , 13 (6) . |
| MLA | Li, Liyun et al. "A Data-Driven Indirect Approach for Predicting the Response of Existing Structures Induced by Adjacent Excavation" . | APPLIED SCIENCES-BASEL 13 . 6 (2023) . |
| APA | Li, Liyun , Sun, Qingxi , Wang, Yichen , Gao, Yunhao . A Data-Driven Indirect Approach for Predicting the Response of Existing Structures Induced by Adjacent Excavation . | APPLIED SCIENCES-BASEL , 2023 , 13 (6) . |
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Rainfall infiltration can alter the pore-water pressure and decrease matric suction, which can lead to slope instability and landslides. Most of the previous numerical studies conducted on rain infiltration have assumed a two-dimensional (2D) failure mechanism, which neglects the three-dimensional (3D) characteristics of slopes. An analytical assessment framework was developed using the upper-bound theorem of limit analysis to determine the factor of safety and failure pattern in the case of a 3D vertical cut slope under diverse rainfall situations combined with the unsaturated soil mechanics. The Green-Ampt model was adopted to depict the infiltration process and the progression of the wetting front into the soil. The slope factor of safety was determined using the energy balance equation by adopting the strength reduction approach. The validity of the framework was verified using the numerical simulation method. The effects of duration, intensity, and patterns of rainfall and the 3D traits of slope on the slope failure pattern and stability were determined. A set of design charts was included for the preliminary design. The present study quantitatively determines the stability of slopes susceptible to rainfall infiltration.
Keyword ：
Rainfall infiltration Rainfall infiltration Three-dimensional slope stability Three-dimensional slope stability Failure pattern Failure pattern Stability charts Stability charts Unsaturated soil Unsaturated soil
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| GB/T 7714 | Xu, Jingshu , Du, Xiuli , Zhao, Xu et al. Analytical Stability Analysis of Rainfall-Infiltrated Slopes Based on the Green-Ampt Model [J]. | INTERNATIONAL JOURNAL OF GEOMECHANICS , 2023 , 23 (2) . |
| MLA | Xu, Jingshu et al. "Analytical Stability Analysis of Rainfall-Infiltrated Slopes Based on the Green-Ampt Model" . | INTERNATIONAL JOURNAL OF GEOMECHANICS 23 . 2 (2023) . |
| APA | Xu, Jingshu , Du, Xiuli , Zhao, Xu , Li, Liyun . Analytical Stability Analysis of Rainfall-Infiltrated Slopes Based on the Green-Ampt Model . | INTERNATIONAL JOURNAL OF GEOMECHANICS , 2023 , 23 (2) . |
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Abstract ：
Buried pipelines are an essential underground infrastructure of modern societies, which is susceptible to damage during earthquake events. The characteristics of seismic excitation that impact pipelines are affected by the spatial distribution of seismic waves and the large extent of long pipelines. A shaking table testing program was conducted on scaled buried pipeline model to investigate its seismic response under non-uniform ground motion. The pipelines-sand model was enclosed in a suspension continuum soil box excited using three shaking tables that can induce uniform and non-uniform seismic excitations. The soil bed was uniform dry sand and the model pipeline was 6.0 m in length and 150 mm in diameter. The soil was instrumented with accelerometers along the soil profile, while the pipeline was instrumented with strain gauges and accelerometers around the pipeline. The soil-pipeline model was subjected to twenty-four different ground motions. The recorded data from all instrumentation were analyzed to evaluate the influence of non-uniform seismic excitation on the pipeline response. The results demonstrated that the pipeline response to longitudinal acceleration was larger than the response of surrounding soil under non-uniform excitation. In addition, the peak pipeline tensile and compressive strains to non-uniform ground motion was about twice that under uniform ground motion.
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| GB/T 7714 | Han, J. Y. , El Naggar, M. H. , Guo, Z. K. et al. Seismic Response of Pipelines from Multi-Point Shaking Table Tests [J]. | LIFELINES 2022: 1971 SAN FERNANDO EARTHQUAKE AND LIFELINE INFRASTRUCTURE , 2022 : 727-738 . |
| MLA | Han, J. Y. et al. "Seismic Response of Pipelines from Multi-Point Shaking Table Tests" . | LIFELINES 2022: 1971 SAN FERNANDO EARTHQUAKE AND LIFELINE INFRASTRUCTURE (2022) : 727-738 . |
| APA | Han, J. Y. , El Naggar, M. H. , Guo, Z. K. , Li, L. Y. , Hou, B. W. , Du, X. L. . Seismic Response of Pipelines from Multi-Point Shaking Table Tests . | LIFELINES 2022: 1971 SAN FERNANDO EARTHQUAKE AND LIFELINE INFRASTRUCTURE , 2022 , 727-738 . |
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Abstract ：
The failure of one pipeline may compromise the integrity of adjacent pipelines, especially for closely spaced parallel pipelines. This paper presents a series of multipoint shaking table tests of parallel double pipelines, which were installed in sand beds with three different spacing values to assess the effect of spacing on the seismic response of parallel pipelines. The acceleration and strain data were collected during the shaking tests. The results demonstrated that the acceleration response of soil between the two pipelines under uniform and nonuniform excitation was relatively lower than that of the pipelines due to the influence of the adjacent double pipelines, especially for the nonuniform excitation case. The maximum peak strain values of both pipelines gradually increased as the spacing between them increased under uniform excitation at lower loading intensity. However, for nonuniform excitations and uniform excitation of higher loading intensity, the maximum peak strain of pipelines with spacing of 150 mm was smaller than that with spacing of 100 and 200 mm. These results indicate that the combination of different pipeline spacings and nonuniform excitation could make the pipeline dynamic response more complicated, which should be properly considered in the seismic design of parallel double pipelines.
Keyword ：
Nonuniform seismic excitation Nonuniform seismic excitation Parallel pipelines Parallel pipelines Shaking table Shaking table
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| GB/T 7714 | Han, Junyan , Guo, Zhike , El Naggar, M. Hesham et al. Seismic Response of Parallel Double Pipelines to Longitudinal Ground Motions [J]. | JOURNAL OF PIPELINE SYSTEMS ENGINEERING AND PRACTICE , 2022 , 13 (1) . |
| MLA | Han, Junyan et al. "Seismic Response of Parallel Double Pipelines to Longitudinal Ground Motions" . | JOURNAL OF PIPELINE SYSTEMS ENGINEERING AND PRACTICE 13 . 1 (2022) . |
| APA | Han, Junyan , Guo, Zhike , El Naggar, M. Hesham , Li, Liyun , Shuai, Yi , Du, Xiuli . Seismic Response of Parallel Double Pipelines to Longitudinal Ground Motions . | JOURNAL OF PIPELINE SYSTEMS ENGINEERING AND PRACTICE , 2022 , 13 (1) . |
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Seismic performance analysis of water distribution system (WDS) is an essential step in the seismic design and resilience evaluation of WDS. Network connectivity reliability analysis and the flow-based hydraulic simulation methods are widely used in the seismic performance analysis of WDS. Many researchers choose one of these methods for seismic performance evaluation of WDS, but the comparison between the application results of these two methods is insufficient. This work compares the analysis results of the two methods through the application of benchmark WDS cases in which the connectivity reliability and the water demand performance of user nodes are used as quantitative measures; the two methods were conducted based on the Monte Carlo Simulation to consider the uncertainty of seismic damages of pipelines. Three widely-used benchmark WDSs (Modena, C-Town, Exnet) with different characteristics were used for case study. Through the application results of the benchmark WDSs under different seismic damage scenarios, the correlation, consistency, and statistical characteristics between the results of the two methods were compared. The results show that the correlation and consistency between the connectivity reliability and the water demand performance measure is low; the seismic connectivity reliability usually has a larger value than that of the water demand performance; user nodes with lower connectivity reliability may not necessarily have lower levels of water demand performance. The hydraulic simulation method is considered to be a more reliable analysis method because it includes both the geometry topology of pipelines and the hydraulic characteristics of WDS.
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| GB/T 7714 | Hou, Benwei , Ma, Xitao , Li, Liyun et al. Comparative Study on Seismic Performance Analysis Methods of Water Distribution Systems [J]. | LIFELINES 2022: 1971 SAN FERNANDO EARTHQUAKE AND LIFELINE INFRASTRUCTURE , 2022 : 416-427 . |
| MLA | Hou, Benwei et al. "Comparative Study on Seismic Performance Analysis Methods of Water Distribution Systems" . | LIFELINES 2022: 1971 SAN FERNANDO EARTHQUAKE AND LIFELINE INFRASTRUCTURE (2022) : 416-427 . |
| APA | Hou, Benwei , Ma, Xitao , Li, Liyun , Ren, Can . Comparative Study on Seismic Performance Analysis Methods of Water Distribution Systems . | LIFELINES 2022: 1971 SAN FERNANDO EARTHQUAKE AND LIFELINE INFRASTRUCTURE , 2022 , 416-427 . |
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Abstract ：
The seismic soil response and soil-buried infrastructure interaction are of immense importance for the resilience of urban centres. Shake table testing offers an efficient tool for modeling the seismic soil-structure interaction. This paper presents the design and commissioning of a suspended continuum soil box supported on an array of shake tables to enable simulating homogeneity and inhomogeneity of soil and non-uniform seismic excitation of extended buried structures such as pipelines and tunnels. The large-scale shaking table model involves a steel box 7.3 m x 1.4 m x 1.2 m supported by 3 shake tables. It comprises 3 active rigid boxes (2 end boxes and one middle box) supported on 3 shaking tables and 2 passive (suspended) soft joint boxes to provide continuous soil medium. The continuous box design is modular and allows its expansion to be supported by the available 9 shaking tables for even much longer soil continuum model. The developed test setup was used to investigate the seismic response of free-field soil to verify the performance of the soil continuum box. The sand test model was instrumented with arrays of accelerometers embedded along its height within both rigid and suspended boxes to evaluate the effect of the test setup on the ground motion characteristics in both segments. Dynamic performance of the continuum box is examined by comparing the results of shaking table tests on the box empty and box containing a sand model. The results demonstrat that the soil box did not experience resonance with the sand model, hence it did not affect its response to the shaking. A quantitative analysis is conducted to evaluate the box boundary effects on the soil seismic response in terms of the L2-norm, mu, the acceleration time history waveform and Fourier spectrum characteristics at soil surface and 0.7m below surface. The consistency of surface peak acceleration under different seismic excitations and intensity levels are compared in terms of standard deviation, beta. The results demonstrat that the developed suspended continuum model box performed well and can simulate the continuity and boundary conditions of free-field.
Keyword ：
Suspended continuum modeling box Suspended continuum modeling box Non-uniform seismic excitation Non-uniform seismic excitation Shaking table test Shaking table test Underground structure Underground structure
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| GB/T 7714 | Han, Junyan , El Naggar, M. Hesham , Li, Liyun et al. Design and Commissioning of Continuous Soil Box Supported on Shake Tables Array for Testing Long Geostructures [J]. | SOIL DYNAMICS AND EARTHQUAKE ENGINEERING , 2020 , 132 . |
| MLA | Han, Junyan et al. "Design and Commissioning of Continuous Soil Box Supported on Shake Tables Array for Testing Long Geostructures" . | SOIL DYNAMICS AND EARTHQUAKE ENGINEERING 132 (2020) . |
| APA | Han, Junyan , El Naggar, M. Hesham , Li, Liyun , Hou, Benwei , Xu, Jingshu , Du, Xiuli . Design and Commissioning of Continuous Soil Box Supported on Shake Tables Array for Testing Long Geostructures . | SOIL DYNAMICS AND EARTHQUAKE ENGINEERING , 2020 , 132 . |
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In China, with the rapid development of subway construction, the site deformation induced by subway construction is an interesting and hot issue in civil engineering. Focusing on the mechanism and characteristics of site deformation induced by parallel shield tunnel construction in typical soil-rock composite strata of Changchun region, and relying on the subway tunnel between Northeast Normal University Station and Gongnong Square Station, which belongs to the Changchun Metro Line 1, the tunnel construction process is simulated using FLAC(3D)software. In this paper, the numerical modeling and parameters for shield tunneling are described in detail, and the mechanism and characteristics of site deformation induced by shield tunneling are discussed systematically. Furthermore, the influence of construction parameters on site deformation, including construction sequence, tunnel spacing and earth chamber pressure, are studied. The results can provide reference for similar projects in the future.
Keyword ：
Soil-rock composite strata Soil-rock composite strata Numerical simulation Numerical simulation Influencing factors Influencing factors Shield tunneling Shield tunneling Site deformation characteristics Site deformation characteristics
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| GB/T 7714 | Li, Liyun , Du, Xiuli , Zhou, Jing . Numerical Simulation of Site Deformation Induced by Shield Tunneling in Typical Upper-Soft-Lower-Hard Soil-Rock Composite Stratum Site of Changchun [J]. | KSCE JOURNAL OF CIVIL ENGINEERING , 2020 , 24 (10) : 3156-3168 . |
| MLA | Li, Liyun et al. "Numerical Simulation of Site Deformation Induced by Shield Tunneling in Typical Upper-Soft-Lower-Hard Soil-Rock Composite Stratum Site of Changchun" . | KSCE JOURNAL OF CIVIL ENGINEERING 24 . 10 (2020) : 3156-3168 . |
| APA | Li, Liyun , Du, Xiuli , Zhou, Jing . Numerical Simulation of Site Deformation Induced by Shield Tunneling in Typical Upper-Soft-Lower-Hard Soil-Rock Composite Stratum Site of Changchun . | KSCE JOURNAL OF CIVIL ENGINEERING , 2020 , 24 (10) , 3156-3168 . |
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Abstract ：
The shaking table test of buried pipelines under multi-point non-uniform excitation is carried out to investigate the nonlinear seismic response of site soil with the use of a nine sub-table array shaking table system in Beijing University of Technology. Through experiments, the macroscopic phenomena, the dynamic characteristics, and the acceleration response of site soil during vibration were observed. Also, the seismic response characteristics and variation of the soil under different earthquake motions and different seismic intensities were studied. The acceleration amplification factor of the free-field and non-free-field soils and the acceleration time history and Fourier spectrum of the same measuring point were compared. The results show that the seismic response of the soil is not only related to the ground motion record and the loading level, but also has a relationship with the buried structures. The damping ratio and the basic frequency of the non-free field are larger than the parameters of the free field. The seismic response of the pipeline is basically subordinate to the response of the soil under lower loading level, but with the increase of loading level, the restraint effect of soil decreases, and the acceleration of the pipeline is slightly larger than that of the soil. The existence of the buried pipeline has a certain influence on the dynamic characteristics of the soil within a certain range, but if the location is beyond that range, the impact will be rapidly weakened. The conclusions obtained are consistent with the macroscopic phenomena of seismic response obtained by the test, which corroborated each other's rationality. Furthermore, the conclusions support the analysis of seismic damage mechanisms of subsequent buried pipelines. © 2020, Science Press. All right reserved.
Keyword ：
Seismic response Seismic response Earthquakes Earthquakes Soils Soils Pipelines Pipelines
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| GB/T 7714 | Han, Jun-Yan , Li, Man-Jun , Zhong, Zi-Lan et al. Seismic response of soil under non-uniform excitation based on shaking table test of buried pipelines [J]. | Rock and Soil Mechanics , 2020 , 41 (5) : 1653-1662 . |
| MLA | Han, Jun-Yan et al. "Seismic response of soil under non-uniform excitation based on shaking table test of buried pipelines" . | Rock and Soil Mechanics 41 . 5 (2020) : 1653-1662 . |
| APA | Han, Jun-Yan , Li, Man-Jun , Zhong, Zi-Lan , Xu, Jing-Shu , Li, Li-Yun , Lan, Jing-Yan et al. Seismic response of soil under non-uniform excitation based on shaking table test of buried pipelines . | Rock and Soil Mechanics , 2020 , 41 (5) , 1653-1662 . |
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