基于Mogi-Coulomb强度准则的竖井井壁空间被动土压力新解  

A New Solution of Spatial Passive Earth Pressure of Shaft Wall Based on Mogi-Coulomb Strength Criterion

作　　者：陈君君 关晓迪 魏欢欢 朱勇锋 马迪 CHEN Junjun;GUAN Xiaodi;WEI Huanhuan;ZHU Yongfeng;MA Di(Henan Architectural Design and Research Institute Co.Ltd.,Zhengzhou 450014,China;School of Civil Engineering and Architecture,Xi’an University of Technology,Xi’an 710048,China;School of Architectural Engineering,Yangling Vocational&Technical College,Xianyang 712100,Shaanxi China;School of Geoengineering and Surveying and Mapping,Chang’an University,Xi’an 710048,China;School of Civil Engineering,Xi’an Traffic Engineering Institute,Xi’an 710300,China)

机构地区：[1]河南省建筑设计研究院有限公司,郑州450014 [2]西安理工大学土木建筑工程学院,西安710048 [3]杨凌职业技术学院建筑工程学院,陕西咸阳712100 [4]长安大学地质工程与测绘学院,西安710048 [5]西安交通工程学院土木工程学院,西安710300

出　　处：《河南科学》2021年第11期1746-1752,共7页Henan Science

基　　金：国家自然科学基金资助项目(50578148,21171147);河南省重点研发与推广专项(202102310547)。

摘　　要：合理选择岩土强度准则对竖井井壁的土压力计算和支护设计具有重要意义,基于Mogi-Coulomb强度准则,针对竖井围岩被动极限平衡状态开展分析,推导了竖井井壁空间被动土压力新解,并将所得结果进行比较验证,得到了中主应力系数对井壁空间被动土压力分布规律的影响.分析表明:竖井井壁空间被动土压力随竖井深度呈幂函数曲线分布,当中主应力系数b小于0.5时井壁空间被动土压力随着b值的增大而增大,当b大于0.5时井壁空间被动土压力随着b值的增大而减小,且b为0.5时被动土压力值为最大值,结果关于中间主应力系数b为0.5对称,较好地反映了岩土强度的中主应力效应及其区间性.Reasonable selection of geotechnical strength criterion is of great significance to earth pressure calculation and support design of shaft wall.Based on the Mogi-Coulomb strength criterion,this paper analyzes the passive limit equilibrium state of shaft surrounding rock,derives a new solution of spatial passive earth pressure of shaft wall,and verifies the obtained results.The influence of medium principal stress coefficient on spatial passive earth pressure distribution law of shaft wall is obtained.The analysis shows that the spatial passive earth pressure of shaft wall presents a power function curve distribution with shaft depth.When medium principal stress coefficient b is less than 0.5,the spatial passive earth pressure of shaft wall increases with the increase of b value.When b is greater than0.5,the spatial passive earth pressure of shaft wall decreases with the increase of b value.When b is 0.5,the passive earth pressure is the maximum.The results are symmetrical abou the intermediate principal stress coefficient b of 0.5,which well reflects the effect of intermediate principal stress and interval of geotechnical strength.

关 键 词：竖井 Mogi-Coulomb强度准则 中主应力系数 空间被动土压力 

分 类 号：TU43[建筑科学—岩土工程]