Model test to investigate the failure mechanisms and lining stress characteristics of shallow buried tunnels under unsymmetrical loading

Lei, Mingfeng; Peng, Limin; Shi, Chenghua

doi:10.1016/j.tust.2014.11.003

Cited by 122 publications

(33 citation statements)

References 6 publications

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“…e displacement and stress evolution laws of surrounding rock supported by the pressure relief anchor box beam system were elucidated. Lei et al [13] designed an experimental programme and simulated the excavation of three asymmetrically loaded model tunnels with different bias angles to reveal the failure mechanism of both the lining and surrounding rock on shallow buried tunnels under asymmetrical load. Jiang et al [14] explored the relationships among advancing direction, strata behaviors, and rock burst induction by establishing two physical models.…”

Section: Introductionmentioning

confidence: 99%

Instability Process of Crack Propagation and Tunnel Failure Affected by Cross‐Sectional Geometry of an Underground Tunnel

Hao

Shao-hua

Jin

et al. 2019

Advances in Civil Engineering

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The process of crack propagation and tunnel failure is affected by the cross-sectional geometry of an underground tunnel. In order to quantify the effect of section shape on the process of crack propagation in deep tunnels under high ground stress conditions, a total of four physical models with two cross-sectional shapes and twelve stress levels were designed and several large-scale physical model tests were conducted. The results indicated that, when the vertical stress is 4.94 MPa, the length and depth of the cracks generated in the rock surrounding the horseshoe tunnel are about eight times that around a circular tunnel. The position where the circumferential displacement of the horseshoe tunnel begins to be stable is about two, to two and a half, times that around a circular tunnel. After the deep chamber was excavated, continuous spalling was found to occur at the foot of the horseshoe tunnel and microcracks in the surrounding rock were initially generated from the foot of the side wall and then developed upwards to form a conjugate sliding shape to the foot of the arch roof, where the cracks finally coalesced. Discontinuous spalling occurred at the midheight of the side wall of the circular tunnel after excavation, and microcracks in the surrounding rock were initially generated from the midheight of the side wall and then extended concentrically to greater depth in the rock mass surrounding the tunnel. Tensile failure mainly occurred on the surface of the side wall: shear failure mainly appeared in the surrounding rock.

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Section: Introductionmentioning

confidence: 99%

Instability Process of Crack Propagation and Tunnel Failure Affected by Cross‐Sectional Geometry of an Underground Tunnel

Hao

Shao-hua

Jin

et al. 2019

Advances in Civil Engineering

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“…Leung and Meguid have analyzed the variation of the earth pressure distribution after the occurrence of cavity for different locations around existing tunnels [5]. Lei has analyzed the stress distribution, the changing rule, and the lining failure process in tunnel structure and surrounding rocks for shallow-buried tunnels under the action of unsymmetrical load with different bias angle through model test [6]. Amedeo Manuello has carried out real-time research on the damage evolution of two arch units for precast concrete on certain highway tunnel and has analyzed the cracking and damage mode using multichannel acoustic emission acquisition system which is able to wirelessly transmit and process data on the spot [7].…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation on the Influence of Regional Concrete Spalling on Shield Tunnel Segments

Wang

Liu

et al. 2019

Advances in Civil Engineering

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Based on the field investigation and analysis, the mechanical characteristics of segment structure in shield tunnels are compared and analyzed under the circumstances of different concrete spalling region by the method of similarity model experiment. Through data analysis of acoustic emission, the results for displacement and internal force of shield tunnel segments are clarified on the segment lining, the influential rule of load bearing capacity is also determined, and the deformation and stress for the different concrete spalling region are described as well. The corresponding research results indicate that range for elastic bearing stage is enlarged while it is narrowed for plastic bearing stage, the convergence and deformation and the accumulated event numbers for acoustic emission on critical instability point are obviously increasing, and the process of damage and failure tends to be sudden for segment lining structure. The ultimate bearing capacity of the damaged segment lining obviously decreases due to regional concrete spalling; to be more specific, the reduction rate for ultimate bearing capacity becomes 6%, 6%, and 13%, respectively, when the range of concrete spalling reaches 45°, 60°, and 75°.

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“…It is a research topic involving the stability of tunnel vault which is of great interest. To solve the problem caused by unsymmetrical loading [1], many theoretical studies have been conducted concerning the mechanical features of surrounding rocks and tunnel structures [2][3][4][5][6]. Former studies rarely adopt the combination of traditional methods with mathematical statistics (i.e.…”

Section: Introductionmentioning

confidence: 99%

Multi-factorial Analysis on Vault Stability of an Unsymmetrically Loaded Tunnel Using Response Surface Method

Zhang

Cheng

et al. 2019

IJE

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This study investigated the vault settlement characteristics of an unsymmetrically loaded tunnel which was excavated by annular excavation via core rock support method. Response surface methodology (RSM) was employed to design the experiments, evaluate the results with the purpose of optimizing the value of design parameters for reducing the vault settlement. The parameters such as horizontal distance, step length, tunneling depth, width of core rock, strength of surrounding rocks and support strength were firstly examined, and a second-order polynomial regression equation was then derived to predict the responses of vault settlement. The percentage contribution, validity of model and effects of different parameters as well as their interactions were assessed by analysis of variance (ANOVA). In the order from high to low effect, these parameters are strength of surrounding rocks, support strength, horizontal distance, width of core rock, tunneling depth, and step length. The results indicated that the influence of uncontrollable factors (i.e. strength of surrounding rocks, tunneling depth, and horizontal distance) on the vault settlement can be reduced through the adjustment of controllable factors (i.e. Width of core rock, step length, and support strength). Moreover, the proposed method in this paper was validated with results of field test measurement and simulation calculation which verified its feasibility.

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Model test to investigate the failure mechanisms and lining stress characteristics of shallow buried tunnels under unsymmetrical loading

Cited by 122 publications

References 6 publications

Instability Process of Crack Propagation and Tunnel Failure Affected by Cross‐Sectional Geometry of an Underground Tunnel

Instability Process of Crack Propagation and Tunnel Failure Affected by Cross‐Sectional Geometry of an Underground Tunnel

Experimental Investigation on the Influence of Regional Concrete Spalling on Shield Tunnel Segments

Multi-factorial Analysis on Vault Stability of an Unsymmetrically Loaded Tunnel Using Response Surface Method

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