非均匀应力场下隧道围岩弹塑性分析统一解  

Unified Solution of Elastic-Plastic Analysis of Tunnel Surrounding Rock under Non-uniform Stress Field

作　　者：周鹏 刘永军 ZHOU Peng;LIU Yongjun(National Road 310 Southward-Moving Project construction and Management Co.Ltd.,Sanmenxia 472000,Henan China;Henan Institute of Transportation Science and Technology Co.Ltd.,Zhengzhou 450015,China)

机构地区：[1]三门峡市国道三一零南移项目建设管理有限公司,河南三门峡472000 [2]河南省交通科学技术研究院有限公司,郑州450015

出　　处：《河南科学》2021年第12期1963-1969,共7页Henan Science

基　　金：河南省交通厅科研项目(2021J10)。

摘　　要：为深入研究非均匀应力场下隧道围岩的弹塑性分析方法,基于统一强度准则,推导了非均匀应力场下隧道围岩应力及塑性区半径解析解.分析表明:隧道围岩弹塑性交界面上径向应力和切向应力均受中主应力系数b的影响,呈现出随着b值的增大,径向应力减小,切向应力增大的特点;同时隧道围岩塑性区半径随着b值的增大而减小,以b为0时隧道顶板围岩塑性区半径作为参照,b为0.25、0.5、0.75和1时塑性区半径分别减小19.2%、29.8%、36.3%和40.8%.表明在工程实践中若能不同程度地考虑中间主应力的影响具有重要意义.In order to further study the elastic-plastic analysis method of tunnel surrounding rock under nonuniform stress field,based on the unified strength criterion,the analytical solution of tunnel surrounding rock stress and plastic zone radius under non-uniform stress field is derived in this paper.The analysis shows that both the radial stress and the tangential stress on the elastoplastic interface of the tunnel surrounding rock are affected by medium principal stress coefficient b,and the radial stress decreases and the tangential stress increases with the increase of b.Meanwhile,the plastic zone radius of surrounding rock decreases with the increase of b.When b is 0,the plastic zone radius of tunnel roof surrounding rock is taken as reference.When b is 0.25,0.5,0.75 and 1,the plastic zone radius decreases 19.2%,29.8%,36.3%and 40.8%respectively.It is of great significance to consider the influence of intermediate principal stress more or less in engineering practice.

关 键 词：隧道 统一强度准则 非均匀应力场 中主应力系数 塑性区半径 

分 类 号：TU43[建筑科学—岩土工程]