乌东德水电站右岸地下厂房开挖围岩破坏模式及形成机制研究
发布时间：2018-08-09 15:57
【摘要】：乌东德水电站右岸地下厂房洞室群布置复杂,中低应力条件下,"陡倾、小夹角"等不利岩层产状导致结构面控制型破坏现象突出。结合地质、现场勘查、常规监测、微震监测及数值模拟资料,全面总结和分析右岸厂房下游拱座岩体破坏模式及形成机制。首先,基于现场勘查及常规监测资料,归纳和总结围岩破坏的基本特征与规律,包括其破坏形式、空间位置、破坏规模、破坏发展特征等主要信息;其次,总结岩体破坏孕育、发展过程中微震活动强度的时间演化规律,分析得到基于微震活动特征的层状岩体破坏前兆;最后,采用"微震监测"为主"数值模拟"为辅的综合分析手段,揭示下游拱座岩体发生弯曲倾倒的破坏本质及其形成机制,探讨岩体结构对拱座围岩破坏的力学影响机制。该研究可为陡倾层状岩体中大型地下洞室优化开挖方案和支护措施提供依据,也可为同类大型地下洞室相似围岩破坏的防控提供参考。
[Abstract]:The cavern group of underground powerhouse on the right bank of Wudongde Hydropower Station is complicated. Under the condition of middle and low stress, the occurrence of "steep dip, small angle" and other unfavorable rock strata leads to the phenomenon of structural plane controlled failure. Combined with geology, field survey, routine monitoring, microseismic monitoring and numerical simulation data, the failure mode and formation mechanism of rock mass in the downstream arch block of right bank factory building are summarized and analyzed in an all-round way. Firstly, based on the field survey and routine monitoring data, the basic characteristics and rules of surrounding rock failure are summarized, including the main information of failure form, space location, damage scale, damage development characteristics, etc. Secondly, the gestation of rock mass failure is summarized. The time evolution law of microseismic activity intensity during the development process is analyzed and the layered rock mass failure precursor based on the microseismic activity characteristics is obtained. Finally, a comprehensive analysis method of "microseismic monitoring" and "numerical simulation" is adopted. This study can provide a basis for the optimization of excavation scheme and supporting measures for large underground caverns in steeply inclined layered rock mass, and can also provide a reference for the prevention and control of similar surrounding rock failure of similar large underground caverns.
【作者单位】： 四川大学建筑与环境学院;四川大学水力学与山区河流开发保护国家重点实验室;成都理工大学地质灾害防治与地质环境保护国家重点实验室;中国长江三峡集团公司;
【基金】：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(51374149) 成都理工大学地质灾害防治与地质环境保护国家重点实验室开放基金(SKLGP2016K018)~~
【分类号】：TV221.2
[Abstract]:The cavern group of underground powerhouse on the right bank of Wudongde Hydropower Station is complicated. Under the condition of middle and low stress, the occurrence of "steep dip, small angle" and other unfavorable rock strata leads to the phenomenon of structural plane controlled failure. Combined with geology, field survey, routine monitoring, microseismic monitoring and numerical simulation data, the failure mode and formation mechanism of rock mass in the downstream arch block of right bank factory building are summarized and analyzed in an all-round way. Firstly, based on the field survey and routine monitoring data, the basic characteristics and rules of surrounding rock failure are summarized, including the main information of failure form, space location, damage scale, damage development characteristics, etc. Secondly, the gestation of rock mass failure is summarized. The time evolution law of microseismic activity intensity during the development process is analyzed and the layered rock mass failure precursor based on the microseismic activity characteristics is obtained. Finally, a comprehensive analysis method of "microseismic monitoring" and "numerical simulation" is adopted. This study can provide a basis for the optimization of excavation scheme and supporting measures for large underground caverns in steeply inclined layered rock mass, and can also provide a reference for the prevention and control of similar surrounding rock failure of similar large underground caverns.
【作者单位】： 四川大学建筑与环境学院;四川大学水力学与山区河流开发保护国家重点实验室;成都理工大学地质灾害防治与地质环境保护国家重点实验室;中国长江三峡集团公司;
【基金】：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(51374149) 成都理工大学地质灾害防治与地质环境保护国家重点实验室开放基金(SKLGP2016K018)~~
【分类号】：TV221.2
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