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学者姓名：李鹏飞
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Abstract ：
The stability of the excavation face plays a pivotal role in ensuring the safety control of shield tunneling. However, there is a dearth of existing literature on the investigation of excavation face stability in inclined composite strata under the influence of seepage. This paper conducts model tests to investigate the instability of excavation faces in inclined strata under varying seepage conditions (three cases). It examines the variations in effective support pressure, surface settlement, and earth pressure throughout the process of instability. The experimental results were validated through numerical simulation. The instability zone and deformation modes are subjected to a comprehensive analysis. The results indicate that the presence of seepage enhances the limit support pressure, consequently reducing the required backward displacement to attain such pressure. The presence of seepage (k = 1.0 and k = 0.5) exerts a more pronounced influence on surface settlement, leading to amplified surface collapse when compared to the no-seepage case (k = 0). The influence extent in front of the excavation face gradually increases as the value of k increases. The soil arching effect is significantly weakened due to the influence of seepage, leading to substantial surface collapse. The findings of this study offer valuable insights into the operational strategies for shielding in water-rich silty clay layers overlying sandy cobble strata.
Keyword ：
Seepage flow Seepage flow Face stability Face stability Shield tunnel Shield tunnel Model test Model test Inclined composite strata Inclined composite strata
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| GB/T 7714 | Cui, Xiaopu , Li, Pengfei , Wang, Chuang et al. Effect of seepage flow on face stability for a tunnel in water-rich silty clay overlying sandy cobble strata [J]. | TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY , 2025 , 161 . |
| MLA | Cui, Xiaopu et al. "Effect of seepage flow on face stability for a tunnel in water-rich silty clay overlying sandy cobble strata" . | TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY 161 (2025) . |
| APA | Cui, Xiaopu , Li, Pengfei , Wang, Chuang , Ge, Zhaoguo , Li, Shaohua , Di, Qiguang . Effect of seepage flow on face stability for a tunnel in water-rich silty clay overlying sandy cobble strata . | TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY , 2025 , 161 . |
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Abstract ：
This paper presents a novel high bolt screw (HBS) active joint engineered to enhance eccentric tensile and compressive support within subway deep foundation pits, thereby bolstering underground structural stability and safety. This comprehensive investigation of the HBS active joint design included an overview, operational principles, stiffness analysis, parameters, and strength verification. To assess the load-bearing and bending capacities of HBS joints accurately under eccentric loading conditions, a series of indoor loading tests were conducted on two joints. The resulting data included load-displacement, moment-rotation, and load-strain curves and failure modes. The results of the numerical simulations closely matched the laboratory results, verifying their reliability. Parametric studies were then performed to examine how different design parameters affect eccentric compression and bending. The findings revealed that the yield load and moment resistance depend on the eccentric distance but not the angle. The load-bearing and bending performance of a joint is positively correlated with parameters such as the screw diameter, extension length, barrel nut height and thickness, and steel tube thickness, although the impact of each parameter varies. Accurate formulae for calculating the moment resistance and initial rotational stiffness were derived, yielding a reliable moment-rotation model. These results highlight the exceptional load-bearing and bending capacities of HBS joints, offering key insights into the design of advanced support systems for subway foundation pits.
Keyword ：
High bolt-screw (HBS) active joint High bolt-screw (HBS) active joint Moment resistance Moment resistance Numerical simulation Numerical simulation Initial rotational stiffness Initial rotational stiffness Moment-rotation model Moment-rotation model
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| GB/T 7714 | Ge, Chenhe , Li, Pengfei , Zhang, Mingju et al. Mechanical analysis of the high bolt screw (HBS) active joint under eccentric loading for prestressed internal support in subway excavation [J]. | ENGINEERING STRUCTURES , 2025 , 329 . |
| MLA | Ge, Chenhe et al. "Mechanical analysis of the high bolt screw (HBS) active joint under eccentric loading for prestressed internal support in subway excavation" . | ENGINEERING STRUCTURES 329 (2025) . |
| APA | Ge, Chenhe , Li, Pengfei , Zhang, Mingju , Li, Ze . Mechanical analysis of the high bolt screw (HBS) active joint under eccentric loading for prestressed internal support in subway excavation . | ENGINEERING STRUCTURES , 2025 , 329 . |
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Abstract ：
In engineering construction, the presence of internal fissures in rock masses and the accumulation of internal energy are the main factors affecting rock failure. To study the effects of fissures and borehole pressure relief on rock masses separately, this paper has prepared various drilling samples with different fissures in the laboratory. On the basis of maintaining the original number of fissures, new fissures and holes are added to explore their effects on the rock mass. Combined with discrete element numerical simulation, the microscopic characteristics of multi-fissure samples and borehole samples are analyzed. The research results indicate that as the fissure dip angle increases, failure occurs gradually along the existing fissures, while the crack development in the borehole samples is mainly concentrated around the holes, and the boreholes have a greater impact than fissures. The study of the change rule and damage characteristics of the fissures before and after drilling of multi-fissure specimens can provide a reference for controlling the deformation of the rock mass in engineering applications.
Keyword ：
drilling specimen drilling specimen rock-like material rock-like material crack propagation law crack propagation law discrete element simulation discrete element simulation
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| GB/T 7714 | Chen, Yang , Li, Pengfei , Xu, Chongbang et al. Study on Borehole Pressure Relief Failure Behavior and Crack Evolution Characteristics of Rock Mass With Multiple Prefabricated Joints [J]. | FATIGUE & FRACTURE OF ENGINEERING MATERIALS & STRUCTURES , 2025 . |
| MLA | Chen, Yang et al. "Study on Borehole Pressure Relief Failure Behavior and Crack Evolution Characteristics of Rock Mass With Multiple Prefabricated Joints" . | FATIGUE & FRACTURE OF ENGINEERING MATERIALS & STRUCTURES (2025) . |
| APA | Chen, Yang , Li, Pengfei , Xu, Chongbang , Huang, Jun . Study on Borehole Pressure Relief Failure Behavior and Crack Evolution Characteristics of Rock Mass With Multiple Prefabricated Joints . | FATIGUE & FRACTURE OF ENGINEERING MATERIALS & STRUCTURES , 2025 . |
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Abstract ：
To investigate the pipeline deformation pattern caused by the excavation of deep foundation pits in composite soil-rock strata, a comprehensive study integrating on-site monitoring and numerical simulation was conducted. This study centered on a deep foundation excavation project in the soft soil in Nanjing's floodplain region. The analyses of pipeline settlement and deformation were performed based on field-measured data. This study investigated the impact of excavation on the mechanical properties of the surrounding soil that resulted in the progressive deformation of adjacent pipelines. Furthermore, numerical simulations were conducted using Plaxis 3D CONNECT Edition v22 finite element analysis software. This study elucidated the influence of factors such as pipeline-pit distance and burial depth on pipeline deformation, conducting a quantitative analysis of their effects. The results indicated that deformation primarily occurs unevenly near pit corners and is less pronounced in soil-rock strata than in single-type soil layers. This study established correlations between pipeline displacements and various factors, offering valuable insights for future excavation projects conducted under similar conditions.
Keyword ：
composite soil-rock strata composite soil-rock strata sensitivity analysis sensitivity analysis pipeline deformation pipeline deformation numerical simulation numerical simulation
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| GB/T 7714 | Wu, Bin , Ge, Chenhe , Li, Pengfei et al. Influence of Deep Foundation Pit Excavation on Adjacent Pipelines: A Case Study in Nanjing, China [J]. | APPLIED SCIENCES-BASEL , 2024 , 14 (2) . |
| MLA | Wu, Bin et al. "Influence of Deep Foundation Pit Excavation on Adjacent Pipelines: A Case Study in Nanjing, China" . | APPLIED SCIENCES-BASEL 14 . 2 (2024) . |
| APA | Wu, Bin , Ge, Chenhe , Li, Pengfei , Yang, Meng , Li, Liulian . Influence of Deep Foundation Pit Excavation on Adjacent Pipelines: A Case Study in Nanjing, China . | APPLIED SCIENCES-BASEL , 2024 , 14 (2) . |
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Abstract ：
When a tunnel crosses a landslide orthogonally, this interaction can easily lead to instability in both the landslide and tunnel structures. Based on the relative positional relationship between a landslide and a tunnel, we studied the stress mode and deformation characteristics of the tunnel in three positional relationships: within the landslide mass, the sliding surface, and the sliding bed. The tunnel is a typical type located on a sliding surface at an engineering site, so we established a numerical model showing the intersection of the tunnel and the sliding surface. The plastic zone distribution, stress characteristics, and displacement distribution characteristics of the surrounding rock before and after tunnel excavation were studied. Based on the simulation results, we analyzed the control effect of anti-slide piles in controlling the tunnel's deformation in the surrounding rock from four perspectives: the arrangement of anti-slide piles, the spacing between piles and tunnels, the diameter of anti-slide piles, and the depth of piles embedded in the bedrock. By analyzing the deformation law of the landslide mass and the force characteristics of the tunnel structure under the orthogonal conditions of a tunnel landslide, we provide theoretical guidance for the adoption of anti-slide piles to control instability in tunnel structures.
Keyword ：
deformation mechanism deformation mechanism control technology control technology anti-slide pile anti-slide pile tunnel-landslide interaction tunnel-landslide interaction
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| GB/T 7714 | Chen, Yang , Li, Pengfei , Lu, Shuai et al. Landslide-Tunnel Interactions and Control Countermeasures under an Orthogonal System [J]. | APPLIED SCIENCES-BASEL , 2024 , 14 (13) . |
| MLA | Chen, Yang et al. "Landslide-Tunnel Interactions and Control Countermeasures under an Orthogonal System" . | APPLIED SCIENCES-BASEL 14 . 13 (2024) . |
| APA | Chen, Yang , Li, Pengfei , Lu, Shuai , Sun, Zhijie , Zhu, Shizhao . Landslide-Tunnel Interactions and Control Countermeasures under an Orthogonal System . | APPLIED SCIENCES-BASEL , 2024 , 14 (13) . |
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Abstract ：
Considering the shortcomings of traditional tunnel support methods like shotcrete, including large rebound, poor water retention, and dust pollution, this paper proposes an innovative method to use mold-bag concrete (MBC) for initial tunnel support. Through macroscopic mechanical tests and microscopic structural characterization, a high-fluidity mix ratio of MBC suitable for actual construction conditions has been developed. To clarify the mechanical properties of MBC, compressive tests were conducted, leading to important conclusions: 1) Moldbags can significantly enhance the compressive strength and ductility of MBC. The specimens of mold-bag concrete of PP (MBC-PP) fail first but have good ductility, while specimens of mold-bag concrete of SNG-PET (MBC-SPET) have the best compressive performance but poor ductility; 2) Without pressurized drainage, mold-bags can increase the compressive strength of MBC due to the water permeability characteristics, with MBC-SPET having the largest increase in compressive strength, 69.1 %; 3) MBC-SPET tests show that increasing pressure has a better effect than increasing drainage time, with 90 s and 20 kg pressurized drainage being the best increase effect. These findings highlight the potential of MBC in addressing the limitations of traditional methods, providing strength enhancement, environmental benefits, and practical feasibility for tunnel support.
Keyword ：
Curing age Curing age Pressurised drainage Pressurised drainage Mold-bag Mold-bag Compressive strength Compressive strength Damage pattern Damage pattern Mold-bag concrete (MBC) Mold-bag concrete (MBC)
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| GB/T 7714 | Huang, Zhengdong , Li, Pengfei , Zhang, Mingju et al. Experimental investigation of the mechanical properties of mold-bag concrete (MBC) for primary support in tunnels [J]. | CONSTRUCTION AND BUILDING MATERIALS , 2024 , 445 . |
| MLA | Huang, Zhengdong et al. "Experimental investigation of the mechanical properties of mold-bag concrete (MBC) for primary support in tunnels" . | CONSTRUCTION AND BUILDING MATERIALS 445 (2024) . |
| APA | Huang, Zhengdong , Li, Pengfei , Zhang, Mingju , Zheng, Hong , Teng, Zhuo , Wang, Shuo . Experimental investigation of the mechanical properties of mold-bag concrete (MBC) for primary support in tunnels . | CONSTRUCTION AND BUILDING MATERIALS , 2024 , 445 . |
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Abstract ：
This paper focuses on the performance of a braced deep excavation in soft soil based on field monitoring and numerical modeling. Laboratory tests were conducted to determine the soil parameters used in the modified Cam-Clay (MCC) model. Intelligent field monitoring means were adopted and a three-dimensional model was established. Spatial and temporal effects induced by the excavation are investigated for the deep -large foundation pit in soft soil. Deformation characteristics of the enclosure structure and the surrounding environment throughout the excavation process are presented. The behaviors of diaphragm walls, columns, the maximum wall deflection rate, ground surface settlement, and utility pipelines were focused on and investigated during the whole excavation process. Besides, the axial forces of the internal supports are analyzed. Based on the measured and simulated data, the following main conclusions were obtained: the numerical simulation results are in good agreement with the measured values, which proves the accuracy of the model parameters; the wall and the ground surface showed the maximum displacement increment at stage 9, which was a coupled product of the "creep effect " of the soft soil in Nanjing, China and the "depth effect " of the excavation; as the excavation progressed, the ground settlement changed from a "rising " to a "spoon -shaped " trend, 6 vm was measured between 6 vm = 0.0686% H and 6 vm = 0.1488% H ; the rebound deformation curve of the pit bottom was corrugated, and the depth of disturbance of the pit bottom after the completion of soil unloading was 2-3 times the excavation depth; the closer the pipeline is to the corner of the pit, the less the excavation process will affect the settlement of the pipeline and the less the obvious pit corner effect will occur; the support strength of the buttress and the longest corner brace should be strengthened during the actual construction process to ensure the stability of the foundation deformation.
Keyword ：
Deformation characteristics Deformation characteristics Creep effect Creep effect Deep excavation Deep excavation Modified Cam-Clay Modified Cam-Clay Corner effect Corner effect
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| GB/T 7714 | Ge, Chenhe , Yang, Meng , Li, Pengfei et al. Performance and environmental impacts of deep foundation excavation in soft soils: A field and modeling-based case study in Nanjing, China [J]. | UNDERGROUND SPACE , 2024 , 18 : 218-238 . |
| MLA | Ge, Chenhe et al. "Performance and environmental impacts of deep foundation excavation in soft soils: A field and modeling-based case study in Nanjing, China" . | UNDERGROUND SPACE 18 (2024) : 218-238 . |
| APA | Ge, Chenhe , Yang, Meng , Li, Pengfei , Zhang, Mingju , Zhang, Zhonghao . Performance and environmental impacts of deep foundation excavation in soft soils: A field and modeling-based case study in Nanjing, China . | UNDERGROUND SPACE , 2024 , 18 , 218-238 . |
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Abstract ：
The terminal joints of the steel support system play a critical role in controlling the deformation and stability of the foundation pit. However, accidents caused by issues with these terminal joints have been frequently observed. This paper introduces the Mold-bag Concrete Clamped Joint (MCCJ) as an innovative joint for enhancing the performance of terminal joints in the steel support system of subway station foundation pit projects. Design principles of MCCJ in the steel support system of the subway station foundation pit project are presented. It provides a detailed explanation of its structural characteristics and working principle, as well as elucidates its stress situation and force transmission mechanism. Three MCCJ specimens were designed and processed for indoor compression load tests, further their load-displacement curves, load-strain curves, and failure modes were obtained and analyzed to explore the load-bearing performance and mechanical characteristics in a more professional and academic manner. The test results demonstrate a designed bearing capacity of over 4000kN, exceeding the axial design bearing capacity of Phi 609/630 steel support and meeting strong joint design requirements. Meanwhile, a refined numerical model of MCCJ was established using Abaqus, validated by comparing numerical and experimental results. Parameter analysis reveals the significant influence of steel tube wall thickness and connecting flange thickness on load-bearing performance, while the mold-bag concrete strength grade enhances MCCJ load-bearing capacity within a certain range. Furthermore, to fulfill the compatibility between MCCJ and existing steel supports, and achieve joint strength and high performance, the parameter optimization directions for MCCJ were proposed.
Keyword ：
Bearing capacity Bearing capacity MCCJ for steel support MCCJ for steel support Mold -bag concrete Mold -bag concrete Pit construction Pit construction Steel support Steel support
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| GB/T 7714 | Zhang, Mingju , Shan, Yuhan , Li, Pengfei et al. Experimental and numerical investigation on behaviors of Mold-bag Concrete Clamped Joints (MCCJ) [J]. | JOURNAL OF CONSTRUCTIONAL STEEL RESEARCH , 2024 , 220 . |
| MLA | Zhang, Mingju et al. "Experimental and numerical investigation on behaviors of Mold-bag Concrete Clamped Joints (MCCJ)" . | JOURNAL OF CONSTRUCTIONAL STEEL RESEARCH 220 (2024) . |
| APA | Zhang, Mingju , Shan, Yuhan , Li, Pengfei , Liu, Wenjie , Huang, Zhengdong . Experimental and numerical investigation on behaviors of Mold-bag Concrete Clamped Joints (MCCJ) . | JOURNAL OF CONSTRUCTIONAL STEEL RESEARCH , 2024 , 220 . |
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Abstract ：
深基坑开挖引起的周边变形是一个复杂的三维空间问题，而进行三维数值分析需要花费大量的时间和人力成本，且通常不在项目的早期阶段进行。为便捷地预测深基坑开挖引起的地层变形，本文提出了一种考虑空间效应的简化方法，可以计算任意位置的地层变形。该方法通过引入平面应变系数，可在二维平面应变计算结果的基础上得出基坑长边中心截面的三维计算结果；进一步通过地层竖向变形传递系数、水平变形传递系数和补余误差函数，计算出地层中任意位置变形。并给出了案例验证。该方法避免了三维数值计算效率低、周期长、费用高等缺陷，简单易用。计算结果能直观地反映基坑地层变形的整体状态及量值大小，能在工程建设早期阶段进行变形预测，更好地指导设计与施工。
Keyword ：
地铁车站 地铁车站 三维变形 三维变形 简化算法 简化算法 深基坑 深基坑
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| GB/T 7714 | 李淑 , 张亚芬 , 王笑然 et al. 北京地铁车站深基坑任意位置变形预测研究 [J]. | 建筑科学 , 2024 , 40 (05) : 47-55,88 . |
| MLA | 李淑 et al. "北京地铁车站深基坑任意位置变形预测研究" . | 建筑科学 40 . 05 (2024) : 47-55,88 . |
| APA | 李淑 , 张亚芬 , 王笑然 , 李鹏飞 . 北京地铁车站深基坑任意位置变形预测研究 . | 建筑科学 , 2024 , 40 (05) , 47-55,88 . |
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Abstract ：
The utilization of spatial curve shield tunnelling has now emerged as the prevailing approach in shield engineering, giving rise to a more intricate ground influence. This paper establishes a three-dimensional computational model based on the elastic pass solution and integrates existing research to derive a comprehensive analytical solution for the additional stresses induced in the ground during shield tunnel construction under complex spatial curve conditions formed by connecting two simple line segments. The theoretical approach proposed in this study is subsequently validated through the utilization of a sophisticated numerical model and the approximate solution derived from previous research. Based on the yaw tunneling phenomenon of a shield in spatial curves, this paper independently analyzes the additional stress field of the soil by incorporating relevant yaw parameters and ultimately derives a series of fundamental principles for shield tunneling in space curves. The findings presented in this paper have significant implications for a wide range of shield tunneling projects.
Keyword ：
Yaw boring Yaw boring Space line Space line Additional stress Additional stress Shield tunnel Shield tunnel Ground loss Ground loss Construction load Construction load
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| GB/T 7714 | Xie, Jiannan , Li, Pengfei , Jia, Fei et al. Analytical investigation of additional stresses induced by yaw tunneling of shield in spatial curves [J]. | TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY , 2024 , 153 . |
| MLA | Xie, Jiannan et al. "Analytical investigation of additional stresses induced by yaw tunneling of shield in spatial curves" . | TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY 153 (2024) . |
| APA | Xie, Jiannan , Li, Pengfei , Jia, Fei , Ge, Zhaoguo , Li, Shaohua . Analytical investigation of additional stresses induced by yaw tunneling of shield in spatial curves . | TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY , 2024 , 153 . |
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