基于滑动测微计的地下洞室围岩变形分析

以呼和浩特抽水蓄能电站为例,应用滑动测微计对施工期地下洞室围岩表面和深度变形进行监测。近20个月监测资料表明,监测期间地下洞室处于稳定状态,围岩表面变形较大值发生于地下洞室第五、六层开挖过程中。由于围岩深度变形主要由岩体结构面张开引起,配合多点位移计进行校核验证,则可判断围岩结构面张开位置。可见开挖过程的变形监测,可实时指导施工、优化设计、保证地下洞室开挖安全。

Surrounding Rock Deformation Analysis of Underground Chamber Based on Sliding Micrometer

Taking Hohhot pumped storage power station for an example, the sliding micrometer is used to monitor the surface and deep surrounding rock deformation of underground chamber during construction period. The last 20 months monitoring data indicates that the underground chamber is safe during the monitoring period and the surrounding rock surface deformation is greater in the fifth and sixth layers of underground chamber during excavation. Because the deep deformation of surrounding rock is caused mainly by the expanded structural plane, the position of expanded structural plane can be determined based on the comprehensive analysis of the data of sliding micrometer. The deformation monitoring can guide the construction work, optimize design and provide the safety for excavation of underground chamber.