岩体初始地应力场对地下洞室围岩变形及应力的影响

基于施工力学的分析方法，建立了地下洞室开挖仿真计算的有限元列式、施工过程中岩体初始地应力场的释放上的卸荷是影响洞室稳定的主要因素，结合工程实例计算，分析了初始地应力场对地下洞室围碉变莆、应力的影响，结果表明，岩体的初始应力场侧向应力分量愈大，洞室侧墙内缩位移愈大而环向压力测有所减小，并使得顶拱沉降位移减小，环向压应力增大。

Influence of Initial Stress Field of Rock Masses on Deformations and Stresses of Surrounding Rock of Underground Openings

On the Basis of analysis of construction mechanics, FEM formulae of excavation emulation computation for underground chambers are developed in this paper that the unloading caused by the release of the initial stress of rock masses in construction is the major factor affecting the stability of the surrounding rock of underground openings. The computation of an engineering project is given, and the influence of the initial stress field of rock masses on the deformation and stress of the surrounding rock of underground chambers is analyzed. It is shown that the more side stress in the initial stress field, the larger displacement in the side wall of the underground chember, but the less ring stress. As a result, the settlement displacement of the top arch reduces, and ring stress increases.