摘要
针对隧道开挖围岩产生塑性屈服的应力条件变化及稳定性问题,根据隧道围岩的平衡条件和统一强度理论塑性条件,求解得到了圆形隧道的径向应力和环向应力。分析了平面应变条件下统一强度理论的强度参数及围岩支护压力与隧洞半径之间的关系。探讨了平面应变下中主应力参数和统一强度理论次主剪应力系数变化条件下圆形隧道围岩径向应力和切线应力随径向半径的变化规律分布。考虑了支护压力和平面应变统一强度理论中主应力参数和次主剪应力系数对塑性域半径的影响,分析结果表明引入中主应力参数的塑性计算结果更加符合实际。
In this paper, the change of stress condition and stability of plastic yield caused by surrounding rock in tunnel excavation, and the radial stress and circumferential stress of circular tunnels are obtained according to the equilibrium condition of tunnel surrounding rock and the plastic condition of unified strength theory. The strength parameters of the unified strength theory and the relationship between the surrounding rock support pressure and the tunnel radius under plane strain condition are analyzed. The variation of radial stress and circumferential stress along the radius of the surrounding rock of the circular tunnel under the condition of the medium principal stress parameter in the plane strain and the primary shear stress coefficient in the uniform strength theory is discussed. The influence of support pressure, the medium principal stress parameter and the secondary principal shear stress coefficient of the unified strength theory under plane strain condition on the plastic domain radius is considered. It is indicated that the plastic calculation results of the medium principal stress parameters are more practical.
作者
常帅斌
刘小康
邵生俊
李军琪
陈明
CHANG Shuaibin;LIU Xiaokang;SHAO Shengjun;LI Junqi;CHEN Ming(China Railway 12th Bureau Group No.4 Engineering Co.,Ltd.,Xi’an,Shaanxi 710021,China;Xi’an University of Technology,Xi’an,Shaanxi 710048,China;Shaanxi Key Laboratory of Loess Mechanics and Engineering,Xi’an,Shaanxi 710048,China)
出处
《水利与建筑工程学报》
2020年第2期205-209,共5页
Journal of Water Resources and Architectural Engineering
关键词
围岩应力
统一强度理论
平面应变
中主应力
塑性域
surrounding rock stress
uniform strength theory
plane strain
medium principal stress
lastic region
