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岩石高边坡稳定性是水电工程建设能否顺利进行的关键问题之一。锦屏一级水电站左岸边坡地应力高,断层裂隙发育,岩体卸荷深度大,地质条件复杂,边坡在施工期和运行期的稳定性问题十分突出。介绍左岸边坡微震活动特征,并对开挖卸荷过程微震活动性时空分布规律以及与不同时段、区域的施工工况进行对比分析,对岩石微破裂萌生、发育、扩展、聚集趋势与岩体损伤关系进行探讨,得到左岸边坡微震活动与施工响应之间的相互关系。结果表明:大坝基坑、煌斑岩脉置换斜井、1 670 m雾化区边坡排水廊道开挖和边坡弱层固结灌浆引起的深部岩体卸荷松弛而诱致微震活动性,可以很好地揭示和反映现场施工工况。研究成果可供其他类似岩质高边坡工程借鉴、参考。
The stability of rocky high slope is one of the key issues for the successful construction of hydropower projects. The left bank slope of Jinping I Hydropower Station has high ground stress, fault fissures, large unloading depth of rock mass and complicated geological conditions. The stability of slope during construction and operation is very prominent. This paper introduces the characteristics of microseismic activity of the left bank slope and analyzes the spatiotemporal distribution of microseismic activity during excavation and unloading, as well as the comparison with the construction conditions at different time zones and regions. The micro-fracture initiation, development, propagation, Damage relationship between the left bank slope microseismic activity and the construction of the relationship between the response. The results show that the microdrop motion is induced by the unloading and relaxation of the deep rock mass caused by excavation of dam foundation pit, lamprophyre replacement lampshade, drainage culvert of 1670 m atomization area and consolidation grouting of weak soil layer, Can well reveal and reflect the site construction conditions. The research results can be used for other similar high rock slope engineering reference.