基于微震监测的高地应力深埋地下厂房中下层开挖技术研究

Research on Middle and Lower Layer Excavation Technology of High-geostress Deep-buried Underground Powerhouse Based on Microseismic Monitoring

猴子岩水电站地下厂房位于高地震烈度、高地应力的深埋岩体内,开挖存在岩爆、塌方等安全隐患和施工技术难题。基于微震监测系统的潜在失稳区域预测,形成了"深层预裂、薄层开挖、随层支护"的高地应力深埋地下厂房中下层梯段开挖施工程序和工艺,该工艺有利于加强岩体的稳定性和支护的时效性,有效解决和改善了洞室边墙的开挖支护施工质量,从而保证了安全的施工生产活动。

The underground powerhouse of Houziyan Hydropower Station is located in deep rock mass with high seismic intensity and high geostress. The excavation of powerhouse is faced with safety risks of rock rupture and collapse and some technical problems of construction. Based on the potential instability prediction of microseismic monitoring system, the excavation procedure and technology of ＂Deep pre-cracking, thin-layer excavation, timely supporting after layer excavation＂ is formed for the bench excavation of the middle and lower layer of powerhouse. The excavation technology is beneficial to strengthen the stability of rock mass and the timeliness of supporting and effectively improves the excavation and supporting quality of cavern sidewall, so the construction safety is ensured.