乌东德水电站地下厂房开挖过程微震监测与围岩大变形预警研究

发布时间：2018-05-17 20:11

本文选题：水利工程 + 乌东德水电站　；参考：《岩石力学与工程学报》2017年S2期

【摘要】：乌东德水电站右岸地下厂房洞室群地质条件复杂,大规模洞室开挖导致围岩变形问题突出,严重影响施工进度及人员安全。引入高精度微震监测系统,分析微震时空演化特征,结合现场施工动态、地质资料和常规监测数据,揭示地下厂房围岩损伤特征;对比地下厂房围岩外观变形监测数据,探讨围岩大变形过程中震源参数演化规律,提出围岩大变形预警方法。研究表明:微震时空分布规律能够很好地反映地下厂房施工动态对围岩扰动情况,微震事件聚集演化与围岩变形损伤密切相关;围岩大变形开始前,微震活动频率增加;能量指数迅速增长至较高水平,视体积均匀增加;微震信号频率呈降低趋势。研究结果可为地下厂房洞室群后续开挖、加固及围岩大变形风险预测提供重要参考。
[Abstract]:The geological conditions of the caverns of the right bank underground powerhouse of Wudongde Hydropower Station are complex, and the surrounding rock deformation problem caused by the large-scale excavation of the caverns is prominent, which seriously affects the construction progress and the safety of the personnel. High precision microseismic monitoring system is introduced to analyze the space-time evolution characteristics of microearthquakes, combined with site construction dynamics, geological data and routine monitoring data, the damage characteristics of surrounding rock of underground powerhouse are revealed, and the deformation monitoring data of surrounding rock appearance of underground powerhouse are compared. The evolution law of focal parameters in the process of large deformation of surrounding rock is discussed, and the early warning method of large deformation of surrounding rock is put forward. The results show that the temporal and spatial distribution of microearthquakes can well reflect the disturbance of underground powerhouse construction to surrounding rock, the accumulation and evolution of microseismic events are closely related to the deformation and damage of surrounding rock, and the frequency of microseismic activity increases before the large deformation of surrounding rock. The energy index increases rapidly to a higher level, and the apparent volume increases uniformly, and the frequency of microseismic signals decreases. The results can provide an important reference for further excavation, reinforcement and risk prediction of large deformation of surrounding rock in underground powerhouse caverns.
【作者单位】：西南石油大学地球科学与技术学院;四川大学水力学与山区河流开发保护国家重点实验室;中国长江三峡集团公司;
【基金】：西南石油大学“过学术关”资助计划(201799010061) 国家重点基础研究发展计划(973)项目(2015CB057903) 国家自然科学基金面上项目(51679158)~~
【分类号】：TV221;TV52

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