3D stability analysis of tunnel face with influence of unsaturated transient flow

Hou, Chuantan; Yang, Xiaoli

doi:10.1016/j.tust.2022.104414

Cited by 17 publications

(5 citation statements)

References 45 publications

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“…The upper bound theorem of limit analysis has been widely used in studies of slope stability [17][18][19], tunnel face stability [20][21][22], and foundation-bearing capacity [23]. It can be described as follows: For a given velocity field permitted by the maneuver, the power of external work is equal to the power of the object's internal energy dissipation:…”

Section: Kinematic Methods Of Limit Analysismentioning

confidence: 99%

Seismic Bearing Capacity Solution for Strip Footings in Unsaturated Soils with Modified Pseudo-Dynamic Approach

Zhou

2023

Mathematics

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In engineering mathematics, the unsaturated nature of soil has a significant impact on the seismic bearing capacity solution. However, it has generally been neglected in the published literature to date. Based on the kinematic approach of limit analysis, the present study proposes a method for calculating the bearing capacity of shallow strip footings located in unsaturated soils, taking four common types of soils as examples. The modified pseudo-dynamic (MPD) approach is used to calculate the seismic forces varying with time and space, and the layerwise summation method is used to derive the power generated by the seismic forces. In the calculation of internal energy dissipation, this paper introduces the effective stress based on the suction stress to derive the cohesion expression at different depths. The analytical formula of bearing capacity is obtained by the principle of virtual work, and its value is optimized by the Sequential Quadratic Programming (SQP) algorithm. In order to verify the validity of the proposed method, the present results are compared with the solutions published so far and a good agreement is obtained. Finally, a parametric study is performed to investigate the influence of different types of parameters on the bearing capacity.

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Section: Kinematic Methods Of Limit Analysismentioning

confidence: 99%

Seismic Bearing Capacity Solution for Strip Footings in Unsaturated Soils with Modified Pseudo-Dynamic Approach

Zhou

2023

Mathematics

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“…(1) Theoretical Analysis. The notion of unsaturated transient flow was developed by Hou and Yang (2022) [13] in their investigation of tunnel face stability. They integrated this concept into a three-dimensional (3D) framework and employed a closed-form approach to characterize the variability of saturation, suction stress, and apparent cohesiveness in soils that are partially saturated.…”

Section: Introductionmentioning

confidence: 99%

“…These methods showed that an increase in instability is caused by a weak interlayer container, lower-layer features, and inadequate interlayer location and thickness. They also highlighted the crucial angle related to the rock strata' [13] in their investigation of tunnel face stability. They integrated this concept into a three-dimensional (3D) framework and employed a closed-form approach to characterize the variability of saturation, suction stress, and apparent cohesiveness in soils that are partially saturated.…”

Section: Introductionmentioning

confidence: 99%

Progressive Failure Mechanism of Shield Tunnel Face in Complex Urban Geological Environment

Huang,

Han

2024

Buildings

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The construction of multiple tunnels across inland rivers has had a significant influence on the improvement of the transportation infrastructure. The technology for constructing tunnels is progressing towards the development of larger cross-sections, longer distances, and the ability to withstand high hydraulic pressure in complex hydrogeological conditions, including high-permeability strata. In order to ensure the face stability of shield tunnels under high hydraulic pressure that crosses a fault fracture zone, it is necessary to study the progressive failure mechanism of shield tunnel faces induced by high hydraulic pressure seepage. This paper employs finite element numerical simulation software to methodically examine the variation in the characteristics of the water seepage field, limiting support force, and face stability failure mode of shield tunnels passing through fault fracture zones with high hydraulic pressure under varying fault fracture width zones. The results show that the formation hydraulic gradient will progressively widen when the tunnel face is located within the undisturbed rock mass and is advanced towards the area of fault fracture. This will raise the likelihood of instability in the shield tunnel and progressively raise the limiting support force on the tunnel face. Moreover, as the tunnel face nears the region of fault fracture within the undisturbed rock mass, the damage range increases gradually. In addition, due to the increase in seepage force, the angle between the failure area and the horizontal plane becomes more and more gentle. On the contrary, as the tunnel’s face moves closer to the undisturbed rock mass from the region of the fault fracture, the damage range gradually decreases, and the dip angle between the damage area and the horizontal plane becomes steeper and steeper due to the decreasing seepage force in the process. The study findings presented in this work are highly significant, both theoretically and practically, for the design and management of safety.

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“…Cheng et al [1] established a simple three-dimensional model of highway tunnels and analyzed the influence of boiling liquid expansion vapor explosions in tunnels. Hou et al [2] established a three-dimensional model of a tunnel face and analyzed its stability under unsaturated and unsteady seepage conditions. Liu et al [3] established a three-dimensional model of a newly built tunnel orthogonally passing under an existing tunnel and proposed a new calculation model of vertical deformation in multilayer strata.…”

Section: Introductionmentioning

confidence: 99%

Modularized and Parametric Modeling Technology for Finite Element Simulations of Underground Engineering under Complicated Geological Conditions

Wu,

Zhuo,

Pei

et al. 2024

CMES

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The surrounding geological conditions and supporting structures of underground engineering are often updated during construction, and these updates require repeated numerical modeling. To improve the numerical modeling efficiency of underground engineering, a modularized and parametric modeling cloud server is developed by using Python codes. The basic framework of the cloud server is as follows: input the modeling parameters into the web platform, implement Rhino software and FLAC 3D software to model and run simulations in the cloud server, and return the simulation results to the web platform. The modeling program can automatically generate instructions that can run the modeling process in Rhino based on the input modeling parameters. The main modules of the modeling program include modeling the 3D geological structures, the underground engineering structures, and the supporting structures as well as meshing the geometric models. In particular, various cross-sections of underground caverns are crafted as parametric modules in the modeling program. The modularized and parametric modeling program is used for a finite element simulation of the underground powerhouse of the Shuangjiangkou Hydropower Station. This complicated model is rapidly generated for the simulation, and the simulation results are reasonable. Thus, this modularized and parametric modeling program is applicable for three-dimensional finite element simulations and analyses.

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3D stability analysis of tunnel face with influence of unsaturated transient flow

Cited by 17 publications

References 45 publications

Seismic Bearing Capacity Solution for Strip Footings in Unsaturated Soils with Modified Pseudo-Dynamic Approach

Seismic Bearing Capacity Solution for Strip Footings in Unsaturated Soils with Modified Pseudo-Dynamic Approach

Progressive Failure Mechanism of Shield Tunnel Face in Complex Urban Geological Environment

Modularized and Parametric Modeling Technology for Finite Element Simulations of Underground Engineering under Complicated Geological Conditions

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