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针对乌东德水电站左岸地下厂房区的角砾岩这一不良地质体的地质力学与稳定性问题,首先采用系统的工程现场调查、孔内电视观察和室内力学试验,揭示了角砾岩基本的物理力学特征以及特殊的方解石胶结方式、似熔融的接触特征和强度特征;进而通过三维数值模拟评估了开挖卸荷后主厂房顶拱角砾岩的基本力学特征,阐明其围岩支护设计的基本要求;左岸主厂房角砾岩实际开挖与支护实践的经验总结分析表明,洞室顶拱稳定性良好。从上述多角度研究表明,由于该类角砾岩经历成岩作用,具有较好的自稳性和承载能力,经合理加强支护后可以作为大型地下洞室顶拱的承载围岩,其力学特性认识和工程防治经验可为同类不良地质体的工程处置借鉴。
Aiming at the problem of the geomechanics and stability of the breccia, which is a poor geological body, in the underground powerhouse area of the left bank of Wudongde hydropower station, firstly, systematic engineering field investigation, intra-hole TV observation and indoor mechanics tests were conducted to reveal the basic Physical and mechanical characteristics and special calcite cementation methods, which are similar to melting contact and strength characteristics. Then, the basic mechanics characteristics of roof arch breccia after excavation and unloading are evaluated by three-dimensional numerical simulation, and its surrounding rock support design The basic requirements of the left bank of the main plant breccia excavation and supporting practice of practical experience and analysis shows that the cavern roof stability is good. From the above-mentioned multi-angle studies, it is shown that due to the diagenesis of this type of breccia, it has good self-stability and bearing capacity, and can be used as the bearing rock of the roof of large-scale underground cavern with reasonable reinforcement and support. Its mechanical properties Knowledge and engineering experience in prevention and treatment of similar poor geological engineering project for reference.