茜坑隧洞围岩稳定性地质因素分析

Analysis of Geological Factors of Xikeng Tunnel Wall Rock Stability

东深供水工程茜坑隧洞全长322 m,围岩为全风化、Ⅳ、Ⅴ类花岗岩。全段均为不良地质条件隧洞。在茜坑隧洞围岩的稳定性分析中,通过地质力学调查、地质测试和各种监测手段,将地质学对现象的研究与测试技术有机地结合起来,提出围岩地质体发展演变过程中的内部信息,实现地质参数定量的和可视的描述,即工程地质监测。根据围岩地质体演变全过程分析,对围岩变形演变过程及其所代表的稳定性状态,进行定性和半定量的分析评价。

Xikeng Tunnel in the Dongshen Water Supply Project has a total length of 322m. The wall rocks are granite of the completely weathered type and Ⅳ, Ⅴ types. The geological property of all the section has been improper for the tunnel construction. In the analysis of the stability of the wall rock in the Xikeng Tunnel, the geological research and the testing technology has been used synchronously, including the geo - mechanical survey, geological testing and various monitoring approaches. The internal information in the evolution of the geological substance has been figured out which has facilitated the quantitative and visual description of the geological parameters. This is also called the engineering geological monitoring. Based on the analysis of the whole process of the evolution of the geological substance in the wall rocks, the process of the transformation of the wall rocks and the stability situation it represents can be analyzed and assessed qualitatively and semi -quantitatively.