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学者姓名：陈福全
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Abstract ：
A series of model tests were conducted to simulate the active failure of narrow cohesionless backfills behind retaining walls rotating about the base (RB mode). The tests aimed to investigate the effect of wall displacement magnitude, backfill widths, and the inclinations of retaining walls and existing structures on the failure mechanism and earth pressure. The test results revealed that the rupture propagation follows a progressive top-down failure pattern and does not extend to the base of the wall under RB mode, contrasting with the assumptions of the existing theoretical solution. Notably, a narrower backfill exhibited multiple parallel shear bands in contrast to the semi-infinite backfill, highlighting the significant impact of backfill geometry on the orientation of these shear bands. Furthermore, the active earth pressure distribution under RB mode displayed an approximately linear trend, slightly reducing earth pressure near the base. The development of earth pressure suggested that the backfill reached the active limit state after the wall had experienced a displacement equal to 0.35% of its height (H). It was observed that the active earth pressure for a backfill width-to-height ratio (B/H) of 0.5 closely corresponded to values obtained through the Coulomb method. Moreover, the results indicated that the active earth pressure increased proportionally with an increase in the B/H ratio and a decrease in the inclinations of both the retaining structures and existing structures.
Keyword ：
Active earth pressure Active earth pressure Deformation Deformation Narrow backfill Narrow backfill Retaining structure Retaining structure
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| GB/T 7714 | Chen, Hao-Biao , Chen, Fu-Quan , Chen, Chang et al. Failure Mechanism and Active Earth Pressure of Narrow Backfills behind Retaining Structures Rotating about the Base [J]. | INTERNATIONAL JOURNAL OF GEOMECHANICS , 2024 , 24 (5) . |
| MLA | Chen, Hao-Biao et al. "Failure Mechanism and Active Earth Pressure of Narrow Backfills behind Retaining Structures Rotating about the Base" . | INTERNATIONAL JOURNAL OF GEOMECHANICS 24 . 5 (2024) . |
| APA | Chen, Hao-Biao , Chen, Fu-Quan , Chen, Chang , Lai, Dao-Liang . Failure Mechanism and Active Earth Pressure of Narrow Backfills behind Retaining Structures Rotating about the Base . | INTERNATIONAL JOURNAL OF GEOMECHANICS , 2024 , 24 (5) . |
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Through a series of model tests accomplished by Particle Image Velocimetry analyses, this study presents the visualization of the displacement field of the narrow soil behind retaining structures under translational mode. The progressive development of failure mechanisms and active earth pressure are measured in the process of tests. Finite element limit analyses are supplementally carried out to investigate and verify the ultimate failure mechanism and active earth pressure acting on retaining structures as the tests. Furthermore, this study carried out parameter studies on the development of failure mechanisms and active earth pressure with different aspect ratios, inclinations of the existing structure, and backfill surface surcharge. Experimental and numerical results show a reasonable verification of each other. With the increase in backfill spacing, the failure mechanism of backfill turns from reflective shear bands into a single shear band, and the earth pressure exerted on the retaining structure increases.
Keyword ：
Earth pressure Earth pressure Failure mechanism Failure mechanism Model test Model test Narrow backfill Narrow backfill Retaining walls Retaining walls
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| GB/T 7714 | Chen, Hao-Biao , Lin, Cheng , Lv, Yan-Ping et al. Active failure mechanism and earth pressure of narrow backfill behind retaining structures [J]. | INTERNATIONAL JOURNAL OF PHYSICAL MODELLING IN GEOTECHNICS , 2024 , 24 (5) : 250-267 . |
| MLA | Chen, Hao-Biao et al. "Active failure mechanism and earth pressure of narrow backfill behind retaining structures" . | INTERNATIONAL JOURNAL OF PHYSICAL MODELLING IN GEOTECHNICS 24 . 5 (2024) : 250-267 . |
| APA | Chen, Hao-Biao , Lin, Cheng , Lv, Yan-Ping , Chen, Fu-Quan . Active failure mechanism and earth pressure of narrow backfill behind retaining structures . | INTERNATIONAL JOURNAL OF PHYSICAL MODELLING IN GEOTECHNICS , 2024 , 24 (5) , 250-267 . |
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Considering the micro-arching effect between pipe umbrella, the paper investigates the mechanical response of pipe umbrellas during tunnel excavation by simulating pipe umbrellas as Timoshenko beams on a Pasternak foundation. The finite difference method is employed to solve the deflection, bending moment, and shear force of pipe umbrellas. By analyzing and contrasting with real-world engineering monitoring data, finite element computation results, and existing theories of other researchers, the reliability of the proposed method is verified, and good agreements are observed. A new parameter delta(p) is introduced in our method to represent the proportion of overlying load transmitted through the pipe umbrella, and influences of stiffness of the surrounding rock in front of the tunnel face, initial support stiffness, pipe umbrella design schemes, and excavation depth on the load transfer capacity of the pipe umbrella are subsequently investigated. The conclusions reveal that increases of surrounding rock stiffness, initial support stiffness, and diameter of pipe umbrellas would all enhance the stability of both the tunnel and pipe umbrellas. However, such enhancements have certain limitations. Particularly, when the excavation footage c <1 m, the pipe umbrella diameter should be specifically selected based on cases.
Keyword ：
Finite difference method Finite difference method Load transfer characteristics Load transfer characteristics Micro-arching effect Micro-arching effect Pipe umbrella Pipe umbrella Timoshenko beam Timoshenko beam Variable foundation coefficient Variable foundation coefficient
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| GB/T 7714 | Wu, Yun-Han , Xiao, Chang-Jin , Chen, Fu-Quan et al. Study on mechanical characteristics of pipe umbrella support in shallow buried tunnels [J]. | TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY , 2024 , 145 . |
| MLA | Wu, Yun-Han et al. "Study on mechanical characteristics of pipe umbrella support in shallow buried tunnels" . | TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY 145 (2024) . |
| APA | Wu, Yun-Han , Xiao, Chang-Jin , Chen, Fu-Quan , Cai, Gang . Study on mechanical characteristics of pipe umbrella support in shallow buried tunnels . | TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY , 2024 , 145 . |
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Estimations of the undrained shear strength (Su) and overconsolition ratio (OCR) of cohesive soil are essential for the evaluation of geology investigation. In comparison to time-consuming laboratory tests, the field piezocone penetration test (CPTu) can rapidly evaluate these parameters. However, existing studies have mainly relied on empirical correlations to estimate the undrained shear strength Su and OCR from CPTu measurements. These correlations are mainly empirical, involving fixed coefficients multiplied by CPTu measurement. Based on the coupled Eulerian-Lagrangian method, this study employed large deformation finite element modeling to summarize and extend the relationships between CPTu measurement and the estimation of undrained shear strength Su and OCR in cohesive soils. These relationships allow for predictions based on CPTu measurements without the requirement for laboratory calibration or referencing to field benchmarks. The accuracy and applicability of the proposed prediction formulas are validated through field case studies for comparative analysis.
Keyword ：
Field piezocone penetration test Field piezocone penetration test Large deformation finite element analysis Large deformation finite element analysis Overconsolidation ratio Overconsolidation ratio Undrained shear strength Undrained shear strength
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| GB/T 7714 | Wang, Zhan-Liang , Chen, Hao-Biao , Chen, Fu-Quan et al. Determination of the overconsolidation ratio and undrained shear strength of cohesive soils by CPTu measurement [J]. | APPLIED OCEAN RESEARCH , 2024 , 146 . |
| MLA | Wang, Zhan-Liang et al. "Determination of the overconsolidation ratio and undrained shear strength of cohesive soils by CPTu measurement" . | APPLIED OCEAN RESEARCH 146 (2024) . |
| APA | Wang, Zhan-Liang , Chen, Hao-Biao , Chen, Fu-Quan , Liu, Li -Yang . Determination of the overconsolidation ratio and undrained shear strength of cohesive soils by CPTu measurement . | APPLIED OCEAN RESEARCH , 2024 , 146 . |
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Over-/under-break excavation is a common phenomenon in shallow tunnelling, which is nonetheless not generally considered in existing complex variable solutions. In this paper, a new equilibrium mechanical model on over-/under-break shallow tunnelling in gravitational geomaterial is established by fixing far-field ground surface to form a corresponding mixed boundary problem. With integration of a newly proposed bidirectional composite conformal mapping using Charge Simulation Method, a complex variable solution of infinite complex potential series is subsequently derived using analytic continuation to transform the mixed boundaries into a homogenerous Riemann–Hilbert problem, which is iteratively solved to obtain the stress and displacement in geomaterial. The infinite complex potential series of the complex variable solution are truncated to obtain numerical results, which is rectified by Lanczos filtering to reduce the oscillation of Gibbs phenomena. The bidirectional conformal mapping is discussed and validated via several numerical cases, and the subsequent complex variable solution is verified by examining the Lanczos filtering and solution convergence, and comparing with corresponding finite element solution and existing analytical solutions. Parametric investigation is conducted to illustrate possible usage of the proposed analytical solution. Further discussions are made to disclose possible defects of the proposed solution for objectivity. © 2024 Elsevier Ltd
Keyword ：
Conformal mapping Conformal mapping Iterative methods Iterative methods Tunneling (excavation) Tunneling (excavation)
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| GB/T 7714 | Lin, Luo-bin , Chen, Fu-quan , Zhuang, Jin-ping . Complex variable solution on over-/under-break shallow tunnelling in gravitational geomaterial with reasonable far-field displacement [J]. | Computers and Geotechnics , 2024 , 174 . |
| MLA | Lin, Luo-bin et al. "Complex variable solution on over-/under-break shallow tunnelling in gravitational geomaterial with reasonable far-field displacement" . | Computers and Geotechnics 174 (2024) . |
| APA | Lin, Luo-bin , Chen, Fu-quan , Zhuang, Jin-ping . Complex variable solution on over-/under-break shallow tunnelling in gravitational geomaterial with reasonable far-field displacement . | Computers and Geotechnics , 2024 , 174 . |
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CPTu (piezocone penetration test) is widely used in engineering practice to determine various parameters of clays under partially drained conditions. However, most existing research is based on undrained or fully drained conditions for clays, leading to underestimation or overestimation of soil strength. By applying the Eulerian-Lagrangian large deformation finite element method to analyse the water-soil interaction, the CPTu driving mechanism in offshore saturated soft clays under different drainage conditions is revealed. An advanced hypoplastic constitutive model for clays is used to simulate the nonlinear behaviour of kaolin under different drainage conditions. The generation, accumulation, and dissipation of excess pore water pressure under different drainage conditions are analysed, as well as the influence of excess pore water pressure on cone tip resistance and the effective stress of the soil during the CPTu penetration process. © 2024 Informa UK Limited, trading as Taylor & Francis Group.
Keyword ：
Large deformation finite element analysis Large deformation finite element analysis normalised permeability normalised permeability partially drained partially drained piezocone penetration test piezocone penetration test water-soil interaction water-soil interaction
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| GB/T 7714 | Chen, C. , Liu, L.-Y. , Chen, F.-Q. et al. Influence of drainage conditions on piezocone penetration mechanism in offshore clays [J]. | Ships and Offshore Structures , 2024 . |
| MLA | Chen, C. et al. "Influence of drainage conditions on piezocone penetration mechanism in offshore clays" . | Ships and Offshore Structures (2024) . |
| APA | Chen, C. , Liu, L.-Y. , Chen, F.-Q. , Chen, H.-B. . Influence of drainage conditions on piezocone penetration mechanism in offshore clays . | Ships and Offshore Structures , 2024 . |
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The adaptive finite element limit analysis (AFELA) method was employed to simulate the active failure mechanisms and plastic region distribution properties under complex backfill conditions to study the active earth pressure of backfill near a firm slope on gravity walls rotating about the bottom. The simulation results revealed that the backfill progressively fails from top to bottom and the backfill in the area above the failure surface enters a plastic state. The slip -line method was combined with the pseudo -static technique to compute the seismic active earth pressure. Compared with the traditional limit analysis method and limit equilibrium method, the seismic slip line method does not need to pre -assume the failure mechanisms. The reliability and rationality of the method are confirmed by comparing the computation results of the seismic slip line method with the computation results of the finite element limit analysis method, the existing experimental data, and the existing theoretical solutions. Furthermore, the impacts of parameters such as backfill geometries, seismic acceleration, and interface strength on seismic active earth pressure are discussed in detail.
Keyword ：
Narrow soil Narrow soil Rotation about the bottom Rotation about the bottom Seismic active earth pressure Seismic active earth pressure Slip-line method Slip-line method
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| GB/T 7714 | Chen, Fu-quan , Chen, Chang , Kang, Wu-zhen et al. Slip-line solution to seismic active earth pressure of narrow c- φ soils on gravity walls rotating about the bottom [J]. | SOIL DYNAMICS AND EARTHQUAKE ENGINEERING , 2024 , 181 . |
| MLA | Chen, Fu-quan et al. "Slip-line solution to seismic active earth pressure of narrow c- φ soils on gravity walls rotating about the bottom" . | SOIL DYNAMICS AND EARTHQUAKE ENGINEERING 181 (2024) . |
| APA | Chen, Fu-quan , Chen, Chang , Kang, Wu-zhen , Xu, Li , Li, Xi-bin . Slip-line solution to seismic active earth pressure of narrow c- φ soils on gravity walls rotating about the bottom . | SOIL DYNAMICS AND EARTHQUAKE ENGINEERING , 2024 , 181 . |
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由于基坑开挖过程存在大量的不确定性，其支护结构在设计阶段无法根据现场环境的变化进行实时变形可靠度分析与预测.围护结构分布范围大，失效位置不可预测.工程监测数据由于监测点数量的限制难以直接反映围护结构连续变化的状态.采用穿越率法，提出一种适用于以地下连续墙为围护结构的深基坑工程的侧向变形预测与分析模型.利用MATLAB建立自适应指数平滑模型，自动计算和预测深基坑围护结构在不同深度的侧向变形.对比实测与预测的侧向变形数据，结果表明该自适应指数平滑模型在短期预测中具有精度较高、误差波动小的特点；同时采用预测数据的超越概率分析表明，深基坑侧向变形的分析模型同样适用于由自适应指数平滑法获得的预测数据，且随着位移限值远离最大监测位移值，分析精度将逐渐提高.通过利用椭圆搜索模式的反距离加权插值法，解决了样本点仅集中分布于深度方向的缺点，使插值结果更加平滑，结合基于深基坑侧向变形的分析模型，实现了围护结构空间曲面的变形预测，使评价反馈方式更加直观简洁.
Keyword ：
侧向变形 侧向变形 变形预测 变形预测 地下连续墙 地下连续墙 深基坑 深基坑 穿越率法 穿越率法 自适应指数平滑法 自适应指数平滑法
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| GB/T 7714 | 许莉 , 林鑫 , 徐杨 et al. 深基坑地下连续墙支护结构侧向变形的改进指数平滑法预测 [J]. | 应用基础与工程科学学报 , 2024 , 32 (04) : 1094-1107 . |
| MLA | 许莉 et al. "深基坑地下连续墙支护结构侧向变形的改进指数平滑法预测" . | 应用基础与工程科学学报 32 . 04 (2024) : 1094-1107 . |
| APA | 许莉 , 林鑫 , 徐杨 , 刘智 , 陈福全 , 王草 et al. 深基坑地下连续墙支护结构侧向变形的改进指数平滑法预测 . | 应用基础与工程科学学报 , 2024 , 32 (04) , 1094-1107 . |
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Mountainous regions are often characterized by the presence of V-shaped gullies, necessitating the construction of retaining structures to support the embankments spanning across these gullies. The gully topography renders conventional two-dimensional soil pressure calculation theory unable to meet the stability requirements for the design of retaining walls (RWs) in mountainous gullies. To address this issue, the sliding bodies of V-shaped gully retaining walls have been identified as high-wall type and low-wall type, and the spatial earth pressure of V-shaped RWs has been determined using the horizontal differential layer method. Combined with numerical simulation, a systematic parametric study is conducted to reveal the impact of the fill-soil internal friction angle, wall-soil contact surface roughness, wall height-to-width ratio, and valley side-slope angle on the active earth pressure acting on the wall. The magnitude of internal friction angle of the fill and the side-bank angle significantly influence the horizontal earth pressure. However, for RWs with finite length along their longitudinal direction, the active earth pressure value at the wall ends is significantly lower than values computed under two-dimensional plane-strain conditions. Moreover, the resultant active force point is located in the range of H/3-H/2 from the wall bottom, where H = wall height, which shows that considering three-dimensional effects is significant. © 2024 American Society of Civil Engineers.
Keyword ：
Spatial earth pressure Spatial earth pressure Translational mode Translational mode V-shaped retaining wall V-shaped retaining wall V-shaped valley V-shaped valley
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| GB/T 7714 | Que, Y. , Zhang, J. , Xie, Z. et al. Spatial Earth Pressure Analysis of V-Shaped Gully Shoulder Retaining Wall under Translational Mode [J]. | International Journal of Geomechanics , 2024 , 24 (10) . |
| MLA | Que, Y. et al. "Spatial Earth Pressure Analysis of V-Shaped Gully Shoulder Retaining Wall under Translational Mode" . | International Journal of Geomechanics 24 . 10 (2024) . |
| APA | Que, Y. , Zhang, J. , Xie, Z. , Chen, F. . Spatial Earth Pressure Analysis of V-Shaped Gully Shoulder Retaining Wall under Translational Mode . | International Journal of Geomechanics , 2024 , 24 (10) . |
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The failure mode of the soil behind the rigid support structure of excavations parallel to tunneling was simulated using the adaptive finite-element limit analysis method. This study showed the effects of tunnel diameter, tunnel construction clear spacing, excavation insertion ratio, and soil strength on the failure mode of the soil. Based on the simulated results obtained from finite-element software, a stress field was constructed for the portion above the horizontal plane at the bottom of the excavation support structure. Three types of boundary value problems were solved based on different regional divisions. Eventually, the stress state at any point within the plastic zone was calculated, providing the active earth pressure on the support structure adjacent to the tunnel during its construction. A comparison between the stress characteristic method calculation results and the finite-element simulation results showed consistency, confirming the efficiency and accuracy of the stress characteristic method in calculating the earth pressure on the support structure of excavations parallel to tunneling. © 2024 American Society of Civil Engineers.
Keyword ：
Earth pressure Earth pressure Excavation support structure Excavation support structure Plastic zone Plastic zone Stress characteristic method Stress characteristic method Tunnel construction Tunnel construction
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| GB/T 7714 | Chen, C. , Lv, Y.-P. , Li, X.-J. et al. Active Earth Pressure on the Rigid Support Structures of Excavations Parallel to Tunnel Construction [J]. | International Journal of Geomechanics , 2024 , 24 (8) . |
| MLA | Chen, C. et al. "Active Earth Pressure on the Rigid Support Structures of Excavations Parallel to Tunnel Construction" . | International Journal of Geomechanics 24 . 8 (2024) . |
| APA | Chen, C. , Lv, Y.-P. , Li, X.-J. , Chen, F.-Q. . Active Earth Pressure on the Rigid Support Structures of Excavations Parallel to Tunnel Construction . | International Journal of Geomechanics , 2024 , 24 (8) . |
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