论文部分内容阅读
针对地下厂房洞室群开挖导致围岩卸荷回弹、岩体质量发生劣化问题,以金沙江某地下厂房洞室群为工程背景,基于卸荷岩体力学理论,采用有限差分法研究了洞室群各期开挖对洞周围岩卸荷力学特性的影响,并根据岩体开挖卸荷后的力学参数,采用岩体分类指数法对洞室群开挖后的岩体质量进行评价。结果表明,随洞室群的施工开挖,洞周围岩卸荷区不断发生演化,其卸荷区深度、范围逐渐增大;洞室群开挖完成后,三大洞室间均有程度不同的卸荷贯通区出现;洞周围岩部分卸荷区岩体质量由开挖前的Ⅱ类变为Ⅲ类。
Aiming at the problems of unloading rebound of surrounding rock and deterioration of rock quality in caverns excavation of underground powerhouse, taking the underground cavern group of Jinsha River as the engineering background, based on unloading rock mechanics theory, the finite difference method According to the mechanical parameters after rock excavation and unloading, the quality of rock mass after tunnel excavation is evaluated by the method of rock mass classification index . The results show that with the excavation of the cavern group, the unloading zone of rocks around the cavern continuously evolves, and the depth and range of the unloading zone gradually increase. After excavation of the caverns group, the levels of the three caverns are different Unloading through the area appears; part of the rock around the rock unload area rock mass quality from before the excavation of Ⅱ into Ⅲ.