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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 ：
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 , 48 (6) : 2409-2426 . |
| 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 48 . 6 (2025) : 2409-2426 . |
| 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 , 48 (6) , 2409-2426 . |
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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 ：
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 ：
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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Abstract ：
This paper investigates the load-bearing properties and failure mechanisms of shield segments with a circular mid-span opening in shield subway tunnels. Two full-scale specimens with opening diameters of 100 and 200 mm were manufactured and tested, revealing that with an increasing opening diameter, the failure mode transferred from uniform tensile fracture of inner arc concrete to the peeling and crushing of the outer arc concrete. Moreover, the loading process can be divided into four stages, i.e. elastic, plastic expansion, failure, and ultimate stages, and each stage shares a critical load. Subsequently, numerical models were established using the elastoplastic damage constitutive of concrete, and its reliability is verified by the experimental results. Afterward, parametric analysis was performed considering the plain concrete loss and reinforced concrete loss. The analysis results show that the plain concrete loss significantly weakens the cracking load of the segment, while reinforced concrete loss has the greatest impact on the failure load. Finally, a comparative analysis is conducted between the bearing characteristics of the local failure segment, standard shield segment, and the segment joint. Overall, the research results can provide a theoretical basis for the field reinforcement and the safety assessment of local failed shield tunnels.
Keyword ：
local failure local failure subway tunnels subway tunnels shield segment shield segment full scale test full scale test parametric analysis parametric analysis Bearing capacity Bearing capacity failure mechanism failure mechanism
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| GB/T 7714 | Gao, Xiaojing , Li, Pengfei , Zhang, Mingju et al. Bearing capacity and failure behavior of segments with a mid-span opening of a shield subway tunnel [J]. | STRUCTURE AND INFRASTRUCTURE ENGINEERING , 2024 . |
| MLA | Gao, Xiaojing et al. "Bearing capacity and failure behavior of segments with a mid-span opening of a shield subway tunnel" . | STRUCTURE AND INFRASTRUCTURE ENGINEERING (2024) . |
| APA | Gao, Xiaojing , Li, Pengfei , Zhang, Mingju , Wang, Haifeng , Jia, Ziqi , Feng, Wu . Bearing capacity and failure behavior of segments with a mid-span opening of a shield subway tunnel . | STRUCTURE AND INFRASTRUCTURE ENGINEERING , 2024 . |
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Abstract ：
This paper presents a prefabricated internal support system for deep foundation pit engineering in subway open cut stations, which is developed based on the merits and demerits of concrete supports and steel supports. The system consists of Prefabricated Multi-limb Concrete-Filled Steel Tube (PM-CFST) support segments and Moldbag Concrete Clamped Joints (MCCJ). Among them, this paper delves into the MCCJ, which serves as a pivotal force for transmission and bearing within the system. The design scheme, structural characteristics, and working principle of the MCCJs are comprehensively elucidated, showcasing the potential of the MCCJ to enhance end node stiffness and strength while achieving secure end fixed connections. The bearing performance of the MCCJs was further investigated by designing and processing three specimens for uniaxial compression load tests. The resulting load-displacement curves, load-strain curves, and failure modes were subsequently analyzed. The test results demonstrate that MCCJ exhibits a favorable compressive load capacity exceeding 5000 kN and possesses excellent ductility. Subsequently, finite element models were established using ABAQUS software for numerical calculations, which were then compared with experimental results to verify their consistency. Moreover, parameter research was conducted to investigate the influence of factors such as the strength grade of concrete inside the steel tube and mold-bag on the yield load and initial compressive stiffness of MCCJs. By analyzing load-strain curves obtained from experimental measurements and conducting quantitative numerical simulation research, this study investigates the deformation characteristics and parameter influence laws of MCCJs.
Keyword ：
Uniaxial compression Uniaxial compression Bearing performance Bearing performance Prefabricated internal support system Prefabricated internal support system Subway station foundation pit engineering Subway station foundation pit engineering
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| GB/T 7714 | Zhang, Mingju , Shan, Yuhan , Li, Pengfei et al. Uniaxial compression bearing capacity of Mold-bag Concrete Clamped Joint (MCCJ) in a prefabricated internal support [J]. | STRUCTURES , 2024 , 66 . |
| MLA | Zhang, Mingju et al. "Uniaxial compression bearing capacity of Mold-bag Concrete Clamped Joint (MCCJ) in a prefabricated internal support" . | STRUCTURES 66 (2024) . |
| APA | Zhang, Mingju , Shan, Yuhan , Li, Pengfei , Huang, Zhengdong , Liu, Wenjie . Uniaxial compression bearing capacity of Mold-bag Concrete Clamped Joint (MCCJ) in a prefabricated internal support . | STRUCTURES , 2024 , 66 . |
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Abstract ：
In tunnel engineering, the rock mass contains a significant number of irregularly distributed joints, and typically exhibits high energy accumulation, thereby posing a risk of rockburst occurrence. Therefore, it is of paramount importance to investigate the fracture propagation behavior in jointed rock masses and assess the impact of borehole pressure relief on mitigating rockburst occurrences for effective prevention and control measures. This paper focuses on failure characteristics and pressure relief effectiveness of non-persistent jointed rock mass with holes through laboratory testing and numerical simulation. In laboratory experiments, rock samples are prepared to include a range of crack dip angles and circular holes. Then, the crack propagation law of crack inclination and circular hole is studied by AE and DIC technology. The experimental results show that with the increase of fracture dip angle, the peak strength and energy change of the sample decrease first and then increase. Due to the existence of holes, the crack propagation direction of the original crack is changed. After drilling, the strain energy of the sample is obviously reduced, which shows that the drilling pressure relief effect is obvious, which can effectively reduce the energy accumulated inside the rock mass and reduce the risk of rockburst. Finally, the PFC numerical simulation software is used to analyze the micro-failure process and energy change law of the sample from three aspects: the relative position of cracks and holes, the diameter of boreholes and the spacing of boreholes. Further understanding of the energy dissipation law and mechanical behavior characteristics of jointed rock mass provides a reference for exploring the pressure relief effect of rock mass and preventing rockburst.
Keyword ：
PFC simulation PFC simulation Energy accumulates Energy accumulates Borehole pressure relief Borehole pressure relief Crack evolution Crack evolution
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| GB/T 7714 | Chen, Yang , Li, Pengfei , Xu, Chongbang et al. Failure characteristics and pressure relief effectiveness of non-persistent jointed rock mass with holes [J]. | THEORETICAL AND APPLIED FRACTURE MECHANICS , 2024 , 134 . |
| MLA | Chen, Yang et al. "Failure characteristics and pressure relief effectiveness of non-persistent jointed rock mass with holes" . | THEORETICAL AND APPLIED FRACTURE MECHANICS 134 (2024) . |
| APA | Chen, Yang , Li, Pengfei , Xu, Chongbang , Chen, Miao , Yang, Jiayun . Failure characteristics and pressure relief effectiveness of non-persistent jointed rock mass with holes . | THEORETICAL AND APPLIED FRACTURE MECHANICS , 2024 , 134 . |
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Abstract ：
京张高铁清华园隧道位于北京市海淀区,自学院南路以南入地至清华东路以北五环路以南出地面,全长6020 m,隧道内径11.1 m,外径12.2 m,是全线的重点控制性工程.清华园隧道是北京地区最大直径的盾构隧道,位于北京城市核心区,采用直径为12.64 m的泥水平衡盾构掘进,依次穿越学院南路、北三环、知春路、北四环、成府路、清华东路、双清路共7条主要市政道路和106条重要市政管线,还穿越地铁10号、12号和15号线3条地铁线,全线近距离并行侧穿地铁13号线,是目前国内穿越重要建构筑物最多的国铁单洞双线大直径盾构高风险隧道之一.
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| GB/T 7714 | 吕刚 , 田四明 , 刘方 et al. 京张高铁大直径盾构复杂环境智能建造关键技术 [J]. | 中国科技成果 , 2024 , 25 (19) : 72-73 . |
| MLA | 吕刚 et al. "京张高铁大直径盾构复杂环境智能建造关键技术" . | 中国科技成果 25 . 19 (2024) : 72-73 . |
| APA | 吕刚 , 田四明 , 刘方 , 岳岭 , 刘建友 , 王久军 et al. 京张高铁大直径盾构复杂环境智能建造关键技术 . | 中国科技成果 , 2024 , 25 (19) , 72-73 . |
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