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简要介绍了锦屏一级水电站地下厂房洞室群的工程地质条件、施工期安全监测方法。对围岩变形监测成果进行了统计分析,对围岩变形规律及特点进行了研究。结合施工开挖及地质条件,对围岩变形过程、时效行进行了探讨。经过分析认为厂房地下洞室群围岩变形破坏机理复杂,与岩体强度、应力场分布、岩体工程地质特性、洞室群规模和形状、开挖方式、支护时机和强度等多种因素有关,其中地应力高的大理岩岩体强度相对较低是施工期围岩变形破坏的主要原因。提出了增加开挖层数、减少开挖层高、相邻洞室错层开挖、增加对穿锚索及降低锚索锁定初值等建议措施。
This paper briefly introduces the engineering geological conditions of the underground cavern group of Jinping I Hydropower Station and the safety monitoring methods during the construction period. Surveying results of the surrounding rock deformation were statistically analyzed, and the deformation laws and characteristics of the surrounding rock were studied. Combined with excavation and geological conditions, the deformation process and aging behavior of surrounding rock are discussed. After analysis, it is concluded that the mechanism of surrounding rock deformation and failure of the underground caverns in the factory is complex and is related to the factors such as the strength of rock mass, the distribution of stress field, the geologic characteristics of rock mass, the size and shape of caverns, the mode of excavation, the timing and intensity of support, , The relatively low strength of marble rock with high geostress is the main reason for deformation and failure of surrounding rock during construction. Proposed to increase the number of excavation, reducing the high level of excavation, adjacent to the accidental excavation of the cave, increasing the wear of the anchor cable and reduce the initial value of the anchor cable and other measures recommended.