Collapse mechanism of stratum induced by subsurface excavation for a shallow buried tunnel in water-rich region

IF 6.2 1区工程技术 Q1 COMPUTER SCIENCE, INTERDISCIPLINARY APPLICATIONS

Computers and Geotechnics Pub Date : 2025-10-01 DOI:10.1016/j.compgeo.2025.107672

Fu Huang, Yongtao Wang, Min Zhang, Lu Chen

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引用次数: 0

Abstract

The collapse of stratum induced by subsurface excavation for a shallow tunnel in water-rich region is common in urban tunnel engineering. Although scholars have conducted numerous research on the stability of the soil mass above shallow-buried tunnel roof, the collapse characteristics of the soil mass induced by shallow-buried tunnel construction in water-rich strata have not been well investigated. In this work, a new three-dimensional collapse mechanism of the stratum above shallow-buried tunnel roof is generated “point by point” based on the spatial discretization technique for the first time. A scaled model test is designed to verify the validity of the constructed collapse mechanism. By introducing the pore water pressure which is obtained from numerical simulation as an external force into the virtual work equation, the safety factor of the stratum is derived from the upper bound theorem of limit analysis. Finally, a comparison between the theoretical solutions and numerical solutions have been conducted to prove the effectiveness of the proposed method

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富水区某浅埋隧道地下开挖致地层坍塌机理

富水区浅埋隧道地下开挖引起的地层坍塌是城市隧道工程中常见的问题。虽然学者们对浅埋隧道顶板上土体的稳定性进行了大量的研究，但对富水地层中浅埋隧道施工引起的土体坍塌特性研究较少。本文首次基于空间离散化技术，“逐点”生成了浅埋巷道顶板上岩层的三维坍塌机制。设计了一个比例模型试验来验证所构建的坍塌机制的有效性。通过将数值模拟得到的孔隙水压力作为外力引入虚功方程，利用极限分析的上界定理推导出地层的安全系数。最后，将理论解与数值解进行了比较，验证了所提方法的有效性

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来源期刊

Computers and Geotechnics 地学-地球科学综合

CiteScore

9.10

自引率

15.10%

发文量

438

审稿时长

45 days

期刊介绍： The use of computers is firmly established in geotechnical engineering and continues to grow rapidly in both engineering practice and academe. The development of advanced numerical techniques and constitutive modeling, in conjunction with rapid developments in computer hardware, enables problems to be tackled that were unthinkable even a few years ago. Computers and Geotechnics provides an up-to-date reference for engineers and researchers engaged in computer aided analysis and research in geotechnical engineering. The journal is intended for an expeditious dissemination of advanced computer applications across a broad range of geotechnical topics. Contributions on advances in numerical algorithms, computer implementation of new constitutive models and probabilistic methods are especially encouraged.