Three‐Dimensional Upper Bound Limit Analysis on the Collapse of Shallow Soil Tunnels considering Roof Stratification and Pore Water Pressure

Wang, Hong-Tao; Liu, Ping; Liu, Chi; Zhang, Xin; Yang, Yue; Liu, Luyao

doi:10.1155/2019/8164702

Cited by 8 publications

(5 citation statements)

References 31 publications

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“…In addition, it is different from the existing analytical method [51], where the boundary of each stratum in the collapsing block is connected. When the collapse of the tunnel roof is analyzed by the proposed numerical approach from the lower stratum to the upper stratum sequentially, the boundary of collapsing block 1 and collapsing block 2 could be discrete, that is, x p ≤ x q .…”

Section: Application In Layered Stratamentioning

confidence: 93%

Limit Analysis of Collapse Mechanisms for Tunnel Roofs Subjected to Pore Water Pressure: A Numerical Approach

Liu

Chen

Xie³

et al. 2021

Advances in Civil Engineering

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The collapse mechanism of a circular unlined tunnel roof subjected to the pore water pressure under plane strain conditions is investigated in this article. First, the model of calculating the function expression of the detaching surface for the collapsing block is formed in the framework of the upper bound theorem of limit analysis and the extremum principle. The analytical solution of the pore water pressure around the tunnel in a two-dimensional steady seepage field is employed in the equations of the model. Then, the numerical approach based on the Runge–Kutta algorithm and traversal search method is proposed to solve the complex equations. The obtained expression of the detaching surface for the collapsing block provides the shape of the collapsing block and a theoretical basis for designing the support force for tunnels. The proposed limit analysis method and numerical approach are verified by comparing with existing theoretical solutions and the numerical simulation result, and they are suitable for deep, shallow tunnels and layered strata. Moreover, the effects of different parameters on the collapse mechanism are investigated, and qualitative results are provided.

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Section: Application In Layered Stratamentioning

confidence: 93%

Limit Analysis of Collapse Mechanisms for Tunnel Roofs Subjected to Pore Water Pressure: A Numerical Approach

Liu

Chen

Xie³

et al. 2021

Advances in Civil Engineering

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“…Such flaws can be solved by combining a numerical analysis and an upper bound limit analysis. With its lower cost, shorter period, and better repeatability, a numerical simulation is helpful for predicting the failure position [26,27]. Wang et al [28,29] verified the rationality of the analytical solution for the collapse curve via a vertical displacement cloud picture obtained from a simulation.…”

Section: Introductionmentioning

confidence: 99%

Calculation Method of Loose Pressure in Surrounding Rock Mass

Gao

Zou

et al. 2023

Applied Sciences

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With the implementation of the regional coordinated development strategy, traffic flow has grown explosively. The construction of a larger tunnel section becomes an effective way to solve the highway network’s insufficient transport capability problem. Currently, there is little research on the factors influencing and methods of calculating the loose pressure in the surrounding rock mass for highway tunnels with super-large cross-sections. Based on the Bifurcation Tunnel, which is one of the sign projects in the past five years, this paper discusses the influencing factors for the range of loose zone in deeply buried tunnels using a combination of a numerical analysis and an orthogonal test. The weight of influencing factors is calculated via an efficiency evaluation method. This paper establishes a limit analysis model of the loose pressure in the surrounding rock mass under a non-linear failure criterion based on the fitted boundary function and upper bound limit analysis method and deduces the correlations of the loose pressure. The distribution law of the loose pressure, obtained via the limit analysis method, is consistent with the pressure-monitoring results, verifying the correctness of the proposed calculation method. This study can provide a calculation basis for the design of a supporting structure and the selection of similar super-section tunnel projects.

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“…There is a significant difference in physical and mechanical properties between the fault and the rock mass around the fault, and various geological hazards are often encountered when tunnelling approaches the fault. Among them, water inrush and mud outburst that possess extremely high risks are the most frequently encountered, which not only affects the regular construction of tunnels, resulting in delays, but also seriously 2 of 18 threatens the safety of personnel and construction machinery in the field [2][3][4][5]. During the construction of the Anshi tunnel on the Yunfeng Expressway, a hidden aquifer fracture zone was confirmed in the right-upper part of the right hole at mileage of K42 + 955.…”

Section: Introductionmentioning

confidence: 99%

Evolution Law and Grouting Treatment of Water Inrush in Hydraulic Tunnel Approaching Water-Rich Fault: A Case Study

Gu,

Guo,

Chen

et al. 2024

Applied Sciences

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Tunnel construction adjacent to the fault fracture zone is prone to water inrush disasters, which pose a serious threat to the safety of tunnel construction. To provide theoretical support for the early warning and prevention of water inrush disasters of the tunnel adjacent to the water-rich faults, a numerical analysis based on the three-dimensional discrete element method (DEM) was performed to study the evolution of the displacement and seepage fields of the water-resistant rock mass of a tunnel adjacent to a water-rich fault during the water inrush process by taking the Xianglushan tunnel as the research project. With reference to the obtained results, a grouting reinforcement scheme was developed, and its effectiveness was evaluated. The results indicated that as the tunnel face approached the water-rich fault fracture zone, the effect of water pressure gradually became obvious, and the displacement at the face continuously increased. When the tunnel face was excavated to the position 5 m from the fault, the displacement at the center of the face changed suddenly with a sudden increase in water pressure. The water-resistant rock mass ahead of the center of the face was damaged, and a water inrush disaster occurred in the tunnel. Numerical simulation results demonstrated the feasibility of the grouting reinforcement scheme. The assessment based on the borehole acoustic waves, borehole TV, geological radar detection, and convergence monitoring as well as the excavation results confirmed that the water inrush disasters in the 2# adit of Xianglushan tunnel adjacent to the water-rich fault were effectively prevented and controlled, which can provide a reference for the prevention and treatment of the frequent water inrush disasters in underground projects constructed in the water-rich fault area.

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Three‐Dimensional Upper Bound Limit Analysis on the Collapse of Shallow Soil Tunnels considering Roof Stratification and Pore Water Pressure

Cited by 8 publications

References 31 publications

Limit Analysis of Collapse Mechanisms for Tunnel Roofs Subjected to Pore Water Pressure: A Numerical Approach

Limit Analysis of Collapse Mechanisms for Tunnel Roofs Subjected to Pore Water Pressure: A Numerical Approach

Calculation Method of Loose Pressure in Surrounding Rock Mass

Evolution Law and Grouting Treatment of Water Inrush in Hydraulic Tunnel Approaching Water-Rich Fault: A Case Study

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