Non-orthogonal Failure Behavior of Roadway Surrounding Rock Subjected to Deep Complicated Stress

Ma, Zongyu; Zuo, Jianping; Zhu, Fan; Liu, Haiyan; Xu, Chengyi

doi:10.1007/s00603-023-03397-x

Cited by 8 publications

(3 citation statements)

References 39 publications

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“…After the stress redistribution following roadway excavation, when the deformation of the surrounding rock exceeds its limit, the rock will enter a failure stage. At this point, elastic, plastic, and failure zones will exist in the surrounding rock. − …”

Section: Model Abstraction and Establishmentmentioning

confidence: 99%

Characteristics of Penetration Strength and Fracture Features under Nonuniform Stress Field around Borehole Surrounding Rock

Zhang,

Feng

et al. 2024

ACS Omega

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In the process of mining coal energy, the excavation of roadways and drilling causes the formation of a nonuniform stress field around the penetration holes, which will lead to a significant concentration of stress around the penetration hole. It even leads to the destruction of the surrounding rock of the penetration hole, affecting the integrity of the surrounding rock of the penetration hole. It has an effect on the strength of the rock obtained by the borehole penetration methods. Based on Abaqus software, the numerical model of borehole penetration was constructed by embedding cohesion elements between solid elements. After analyzing the simulation results obtained under different stress boundaries and penetration directions, the following findings are obtained. (1) Using the occurrence of cracks in the borehole surrounding rock as the criterion, the rock is categorized into either an elastic stress state or a plastic stress state after applying different stress boundary conditions. (2) When the borehole surrounding rock is in the elastic (plastic) stress state, the penetration strength increases (decreases) with the increase of lateral pressure coefficient. (3) In the elastic stress state, borehole surrounding rock's fracture area and crack penetration depth increase (decrease) with the increase of lateral pressure coefficient when the penetration direction is parallel (perpendicular) to the maximum principal stress. In the plastic stress state, the fracture area increases, while crack penetration depth decreases with higher lateral pressure coefficient.

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Section: Model Abstraction and Establishmentmentioning

confidence: 99%

Characteristics of Penetration Strength and Fracture Features under Nonuniform Stress Field around Borehole Surrounding Rock

Zhang,

Feng

et al. 2024

ACS Omega

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show abstract

“…In order to ensure the safety of the tunnel structure and operation in the section of the existing subway Line 5, the following suggestions are proposed. (1) In the construction process of the project, the structural displacement monitoring data should be closely combined with the monitoring data related to shield construction, and the inversion calculation of the stratum calculation parameters should be carried out, when necessary.…”

Section: Safety Measures and Suggestionsmentioning

confidence: 99%

“…Urban rail transit construction in China has entered a period of rapid and concentrated development. A shield tunnel is safe, efficient, and can be applied to a variety of strata, and has been widely used in urban rail transit construction [1][2][3][4][5][6]. Nowadays, more and more new rail transit lines pass through existing buildings, and managing the construction of this section of the underpass structure is often the key to determining the duration of the entire line.…”

Section: Introductionmentioning

confidence: 99%

Study on the Influence of an Under-Crossing Parallel Double-Line Shield Tunnel on the Existing Tunnel Structure

et al. 2023

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Extra care should be taken when new tunnels pass through an existing tunnel. If it is not handled properly, this will affect the operation safety of the existing line, and bring security risks to the train’s operation. In order to study the impact of an under-crossing parallel double-line shield tunnel on the existing shield tunnel structure, the influence of tunnel construction on the deformation of overlying strata was analyzed, and the formula for estimating the formation settlement at depth Z below the surface, caused by the excavation of a double-tunnel parallel tunnel, was deduced. Then, a series of three-dimensional finite element numerical simulations were carried out. We analyzed and systematically studied the adverse effects of the tunnel structure of Guangzhou subway Line 5, caused by the tunneling of subway Line 18, evaluated its structure and operational safety, and provided suggestions for site construction. This research demonstrates the following conclusions. (1) The tunnel structures of subway Line 5 and Line 18 are mainly in the strongly weathered argillaceous siltstone stratum, and lightly weathered argillaceous siltstone stratum, respectively, and the stratum where the Line 18 tunnel is located is relatively safe. (2) According to three-dimensional finite element numerical simulation analysis, during the shield-tunneling process of subway Line 18, the maximum X horizontal displacement, the maximum Y horizontal displacement, and the maximum Z vertical displacement of the tunnel structure in subway Line 5 are 1.09, 3.50, and 4.55 mm, respectively. It is considered that the impact of the shield-tunnel penetration of subway Line 18 on the tunnel structure of subway Line 5 is relatively controllable, and does not affect the structure and operational safety. (3) It is suggested that settlement monitoring should be strengthened within the range of 12 m (about 1.5 tunnel diameter D). before and after the excavation axis of the underpass tunnel, and it is necessary to carry out local reinforcement treatment, to prevent adverse effects on the operation of the existing tunnel.

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Experimental Study on an Innovative Method for Pre-split Blasting to Protect Withdrawal Roadways

Yang,

Wu,

et al. 2024

Rock Mech Rock Eng

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Non-orthogonal Failure Behavior of Roadway Surrounding Rock Subjected to Deep Complicated Stress

Cited by 8 publications

References 39 publications

Characteristics of Penetration Strength and Fracture Features under Nonuniform Stress Field around Borehole Surrounding Rock

Characteristics of Penetration Strength and Fracture Features under Nonuniform Stress Field around Borehole Surrounding Rock

Study on the Influence of an Under-Crossing Parallel Double-Line Shield Tunnel on the Existing Tunnel Structure

Experimental Study on an Innovative Method for Pre-split Blasting to Protect Withdrawal Roadways

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