建筑结构学报2024，Vol.45Issue(6)：213-223,11.DOI:10.14006/j.jzjgxb.2023.0004
承压水作用下岩质地层基坑抗突涌安全厚度研究
Research on safety thickness to resist basal inrush failure in rock ground excavations subjected to a confined aquifer
摘要
Abstract
The water inrush or instability failure at the deep excavation base is a common engineering disaster subjected to the action of lower confined water.In order to ensure the basal safety in deep excavations,setting enough safety thickness is the key to prevent such failure.Based on the plastic upper-bound analysis theory,the basal failure range was classified into upper passive zone and lower shear zone in this paper,and a basal inrush failure mechanism for excavations in rock ground was constructed.Then,based on the Hoek-Brown strength criterion,the analytical solutions for the basal failure surface equation,critical safety thickness and critical confined water pressure were derived.On this basis,the influence laws of passive-zone thickness,confined water pressure,rock-mass parameters and other factors on the basal safety thickness and failure range were obtained,and the validity of the proposed method was verified through a comparison with the existing research works and numerical simulation results.The research shows that the critical safety thickness is positively correlated with confined water pressures and rock empirical parameter,and negatively correlated with passive-zone thicknesses,rock empirical parameter,rock compressive strength,rock tensile strength and unit weight.关键词
基坑/突涌/承压水/Hoek-Brown强度准则/上限定理/安全厚度Key words
excavation/inrush failure/confined water/Hoek-Brown strength criterion/upper bound theorem/safety thickness分类
建筑与水利引用本文复制引用
王洪涛,李建华,殷允腾,张红军,宣兆腾,赵明珠..承压水作用下岩质地层基坑抗突涌安全厚度研究[J].建筑结构学报,2024,45(6):213-223,11.基金项目
国家自然科学基金项目(52374093),中国博士后科学基金项目(2022M711314),山东省自然科学基金项目(ZR2022ME088),济南市科研带头人工作室项目(202333054). （52374093）
