彭水地下电站高边墙围岩施工控制技术

Construction control technology for surrounding rock of underground house high side wall of Pengshui Hydropower Station

针对岩体加载和卸荷过程中力学性质的本质区别,以彭水地下电站工程的施工开挖为例,分析了岩体卸荷变形对"大型地下洞室纵轴线顺岩层走向呈0°夹角方案布置在薄层、陡倾角层状灰岩、夹软弱页岩层中的高边墙"的影响,从岩体卸载的角度对围岩施工变形进行了研究。通过超前导洞勘探开挖,埋设先进的监测仪器等,借助监测数据分析其变形特征,有针对性地采取了加固处理措施,有效指导了工程施工。可供同类工程参考。

Aiming at the essential distinction of rock mechanic characteristics during the loading and unloading process,taking the underground powerhouse of Pengshui Hydropower Station as an example,we analyze the impact of unloading deformation on high side wall arranged in thin layer,steep dip-angle limestone with weak intercalated layer,where the axis of the powerhouse parallel to the strata.The construction deformation of rock mass is studied from the aspects of rock unloading.Through excavation of pilot heading,setting up monitoring instruments,we also analyze the deformation features of rock mass and take reinforcement measures accordingly,which guided the construction effectively.