Study on Roof Safe Thickness of Rock Foundation with Karst Cave and Karst Cave-surrounding Rock Stability

Chen, Dongqin; Cao, Yi

doi:10.1088/1757-899x/224/1/012058

Cited by 3 publications

(1 citation statement)

References 5 publications

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“…Despite relatively comprehensive researches on karst tunnels, there are currently no unified research methods of critical construction techniques for tunnels across large karst caves. Actually, current major methods include computer numerical simulation analysis [12][13][14], theoretical analysis [15][16][17], and model experiments [18,19], with its own unique advantages and disadvantages separately. For instance, Pan et al used model experiments and numerical analysis to reveal the displacement, stress, and seepage pressure changes in pressurized water caves during water sudden-inflows [20].…”

Section: Introductionmentioning

confidence: 99%

Force analysis and treatments for Lidong tunnel of Renxin expressway crossing karst caves

Zhu,

Zhang,

et al. 2024

Archives of Civil Engineering

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There are several large karst caves at haunch part of the Lidong Tunnel during construction, together with inrush water due to high pressure within these caves. In light of it, this paper takes YK342+113 section as an example and adopts finite difference software FLAC 3D, so as to analyze tunnel deformation when crossing karst caves under six different working conditions, including with or without karst cave, before and after karst treatment, along with support locations. According to analysis results: First, the wall rock mainly had deformation at tunnel vault when evacuating at the third bench, which is a critical monitoring focus for tunnel construction; Second, karst cave treatment contributed to better conduct forces on both sides of wall rock, thus reducing vault settlement, while not affecting horizontal convergence and upturn of vaults; Third, treatment measures were proved to be effective in minimizing wall rock deformation by comparing deformation curves under different conditions; Fourth, after treatment measures, the angular points within the cave’s chamber had stress concentration, which might cause secondary collapse. Field monitoring data revealed that the final settlement of the tunnel vault was relatively consistent with the numerical analysis results, with a distinct change in daily settlement after initial support construction. By integrating numerical analysis and field monitoring, the rationality of the karst treatment plan was fully verified, providing a valuable reference for similar projects.

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Section: Introductionmentioning

confidence: 99%

Force analysis and treatments for Lidong tunnel of Renxin expressway crossing karst caves

Zhu,

Zhang,

et al. 2024

Archives of Civil Engineering

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Numerical analysis of the influence of dissolution pore structure on mechanical behavior of rock mass

Leng,

Shi,

Liang

et al. 2023

Comp. Part. Mech.

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Influence of Karst Caves on the Pile’s Bearing Characteristics-A Numerical Study

2022

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Compared with the amount of research undertaken on vertical-bearing piles in karst areas, there are fewer studies on the stability of horizontal-bearing piles (e.g., anti-slide piles and supporting piles), and little in the way of theoretical developments. In order to study the influence of karst cave in front of and under the pile on the stability of anti slide pile, this study designs orthogonal test, carries out numerical simulation by using ABAQUS finite element analysis software, deduces the displacement load curve of each group of piles, and then determines the lateral ultimate bearing capacity of anti slide pile when karst cave exists, and Through multiple linear regression analysis and test on the parameters such as the distance between the karst cave under the pile and the pile tip, the span height ratio of the cave in front of the pile and the span height ratio of the cave under the pile, it is concluded that there is a significant correlation between the above participation and the lateral ultimate bearing capacity. The research results have certain guiding significance for the application of anti slide pile in karst area.

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Study on Roof Safe Thickness of Rock Foundation with Karst Cave and Karst Cave-surrounding Rock Stability

Cited by 3 publications

References 5 publications

Force analysis and treatments for Lidong tunnel of Renxin expressway crossing karst caves

Force analysis and treatments for Lidong tunnel of Renxin expressway crossing karst caves

Numerical analysis of the influence of dissolution pore structure on mechanical behavior of rock mass

Influence of Karst Caves on the Pile’s Bearing Characteristics-A Numerical Study

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