【摘要】 以某隧道进出口处含顺向软弱结构面岩质边坡为例,基于施加虚拟支撑力逐步释放法利用ANSYS有限元软件对开挖边坡进行分析,研究层状岩质边坡在成洞过程中围岩变形及力学特征。以实际地应力释放率条件为前提进行计算,对比隧道成洞支护前后边坡围岩的变形特征。结果表明:层状岩质边坡成洞后,围岩应力进行了重新分布,应力集中现象主要出现在拱脚附近及第二条软弱结构面附,控制性结构面附近集中了主要的剪应变;接近真实地应力释放率时支护前后的位移、应力、应变分布基本相同,但是,剪应力和剪应变有一定程度的减小;顺向结构面对开挖后边坡变形具有控制作用,最外层结构面成为了潜在滑带。更多还原

【Abstract】 In this paper,by taking a rock slope with bedding weak structural surface at the entrance and exit of the tunnel,the ANSYS finite element software was used to analyze the excavation slope,and study the deformation and mechanical characteristics of the rock slope,based on the gradual release of virtual support. The results show that the surrounding rocks stress redistributes,and the stress concentration occurs near the arch,after excavation of the layered rock slope. The shear stress concentration band appears near the second weak structure surface,and the shear strain is spread along the control structure. Besides,the displacement,stress and strain distribution of the support are basically the same before and after support,when it is close to the real stress release rate. However,the shear stress and shear strain has a decrease in a certain degree. The bedding weak structural surface controls the deformation of the slope after excavation,and the outer structural surface is the potential slide surface.更多还原