Influence of continuous rainfall on surrounding rock-initial support system of shallow decomposed-rock tunnel

Xu, Jiancong; Li, Ning

doi:10.1007/s12665-010-0638-8

Cited by 12 publications

(5 citation statements)

References 13 publications

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“…The model captures the salient features of shallow tunnels in partially saturated ground, for example, the effect of suction on the deformation and stability of the tunnel. Tunnel failures are often caused by inundation as a result of heavy rainfall (Grasso et al, 2003;Xu & Ning, 2010;Alija et al, 2014) or outfall of pumps. This wetting-induced face failure can be fairly well described by the numerical model.…”

Section: Discussionmentioning

confidence: 99%

Face stability of shallow tunnels in partially saturated soil: centrifuge testing and numerical analysis

Soranzo

Tamagnini

2015

Géotechnique

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In this paper the face stability of shallow tunnels in partially saturated soil is investigated by means of centrifuge testing and numerical analysis. A loess soil is chosen for this study and its properties are characterised by laboratory testing. Centrifuge model tests are carried out at different soil densities and with different depths of water table. The numerical analyses are performed with an advanced constitutive model for partially saturated soil. The constitutive model is implemented in a finite-element code using the Bishop's effective stress. The model parameters are calibrated based on drained triaxial compression tests on partially saturated soil. The wetting collapse of the tunnel face is simulated by imposing a zero pore pressure condition at the ground surface. The numerical results are compared with the centrifuge tests.

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Section: Discussionmentioning

confidence: 99%

Face stability of shallow tunnels in partially saturated soil: centrifuge testing and numerical analysis

Soranzo

Tamagnini

2015

Géotechnique

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“…Firstly, the calculation model is degenerated into the axisymmetric circular tunnel which is homogeneous and isotropic. And then its analytic solution of equivalent Young's modulus and equivalent lateral confinement pressure coefficient of surrounding rock is expressed as follows [8]:…”

Section: Principle Of Pnbmmentioning

confidence: 99%

Parabolic-Apex Numerical Back-Analysis of Mechanics Parameters of Surrounding Rock

Jian

2012

AMM

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The parabolic-apex numerical back-analysis method (PNBM) was proposed to obtain such physical-mechanics parameters as Young's modulus and lateral pressure coefficient of surrounding rock by 3D FEM numerical analysis based on in-situ monitoring data. Taking Xiang-an Subsea Tunnel (located in Xiamen, Fujian Province, China) for example, adopting the PNBM using ABAQUS software, three dimensional elastic-plastic FEM-PNBM of tunnel surrounding rock was validated using in-situ monitoring data. The results show as follows: Using the PNBM, not only may high calculation precision be obtained, better meeting the demand of actual projects, but also more reasonable and reliable physical mechanics indices of surrounding rock such as Young's modulus and lateral confinement pressure coefficient, may be obtained. The applicability and the simplicity of this proposed method also support its usefulness.

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“…Shin et al [4] studied the effect of groundwater flow on a deep circular tunnel with an elastic-plastic homogeneous foundation, and the results showed that groundwater flow at the tunnel wall affects radial and axial deformations. Xu and Li [5] studied the effect of continuous rainfall on the stability of shallow weathered rock tunnels. The results show that the infiltration of rainwater makes the surrounding rock of shallow weathered rock tunnels soften continuously due to continuous rainfall, resulting in the stiffness and confining pressure of surrounding rock coefficient decreases.…”

Section: Introductionmentioning

confidence: 99%

Research on the Influence of Groundwater in Coastal Areas on the Stress and Deformation Characteristics of Integrated Pipe Gallery

Tian

Wang

et al. 2022

Geofluids

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With the high demand for basic resources such as electricity, communication, water supply, and gas in cities, most cities in my country are vigorously developing underground integrated pipe gallery. When constructing pipe gallery in coastal areas, it is necessary to consider the impact of groundwater level on structural calculations. There is still a lack of systematic research in domestic and foreign literature. Relying on the Qingdao West Coast New Area Project, this paper uses a combination of laboratory tests and MIDAS GTS/NX numerical simulation to study the influence of groundwater in the coastal area on the stress and deformation characteristics of the integrated pipe gallery. The results show that (1) the Mises stress on the roof and bottom of the integrated pipe gallery increases continuously with the rise of the groundwater level. Due to the effect of the effective stress, the Mises stress on the side wall shows a decreasing trend. (2) Due to the influence of the construction form of the cross-section interface, the maximum principal stress of each part of the M side is always smaller than that of the N side; with the continuous increase of groundwater level, the maximum principal stress at each part of the N and M sides of the pipe gallery structure joint gradually increases. (3) The overall structure of the pipe gallery floats up. Under the action of the buoyancy force, the bottom plate moves upward, and the surface displacement rises continuously with the rise of the groundwater level. (4) When the groundwater depth is the same, the analysis of the test results and the numerical simulation calculation results are basically consistent, which further verifies the validity of the numerical simulation calculation and has reference value. (5) The engineering example shows that in order to reduce the service life of the integrated pipe gallery, the impact of groundwater on the integrated pipe gallery cannot be ignored.

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Influence of continuous rainfall on surrounding rock-initial support system of shallow decomposed-rock tunnel

Cited by 12 publications

References 13 publications

Face stability of shallow tunnels in partially saturated soil: centrifuge testing and numerical analysis

Face stability of shallow tunnels in partially saturated soil: centrifuge testing and numerical analysis

Parabolic-Apex Numerical Back-Analysis of Mechanics Parameters of Surrounding Rock

Research on the Influence of Groundwater in Coastal Areas on the Stress and Deformation Characteristics of Integrated Pipe Gallery

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