岩土力学2023，Vol.44Issue(11)：3071-3081,11.DOI:10.16285/j.rsm.2022.1728
承压水地层基坑抗突涌稳定性的计算方法
Calculation method of stability against inrush of excavation overlying a confined aquifer
摘要
Abstract
The pressure balance method is adopted in calculating the stability against the inrush of excavation in the current criterion.The effects of soil strength and excavation size are not considered in this method.Therefore,the method gives a conservative evaluation of the situation approaching the critical artesian pressure.Aiming at these problems,firstly,the safety factor is defined according to the principle of shear strength reduction in this paper.The existing method considering soil shear strength along slip surfaces is improved by adopting effective stress analysis and considering the passive zone of excavation.Then,a new calculation method for inrush resistance is proposed based on the elastic plate theory.Subsequently,the results of the finite-element method with reduced shear strength are compared with those of above calculation methods under the plane strain condition.And the effects of the excavation length-width ratio for the improved and proposed methods are further analyzed.Finally,the analysis of an engineering practice is carried out.The analysis shows that compared with the existing methods,the improved and proposed methods in this paper can better reveal the trends of excavation stability against inrush with the change of the artesian pressure and improve the economy on the premise of ensuring the safety of engineering practice.关键词
抗突涌稳定性/承压水/强度折减/有效应力/压力平衡法Key words
stability against inrush/artesian water/shear strength reduction/effective stress/pressure balance method分类
水利科学引用本文复制引用
黄茂松,刘奕晖,俞剑,李弈杉..承压水地层基坑抗突涌稳定性的计算方法[J].岩土力学,2023,44(11):3071-3081,11.基金项目
国家自然科学基金重点项目(No.51738010) （No.51738010）
国家重点研发计划课题(No.2016YFC0800202).This work was supported by the Key Program of National Natural Science Foundation of China(51738010)and the National Key Research and Development Program(2016YFC0800202). （No.2016YFC0800202）
