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在建的白鹤滩地下洞室群规模巨大,具有“高边墙、大跨度、高地应力、复杂地质条件”的特点,在高应力开挖卸荷过程中,遭遇到延展性强且力学性质差的多条大型错动带的影响,使得含错动带岩体遭遇到不同程度的变形破坏问题。结合地质、施工、监测、测试及数值分析等资料,首先从错动带产状、成因和自身特点等方面对错动带的工程特性进行详细论述,然后对因错动带导致工程岩体结构变形失效或破坏的实例进行归纳总结,从结构控制因素上将含错动带岩体的破坏模式划分为塑性挤出型拉伸破坏、结构应力型塌方/掉块和剪切滑移型破坏3种类型;其次,研究分析各类含错动带岩体的破坏特征与机制,包括时空演化过程、形态特征、破坏规模等,初步揭示3种破坏模式对应的力学机制;最后,给出典型的含错动带岩体破坏模式分析预测和支护探讨实例,从而为白鹤滩地下厂房施工过程中含错动带岩体不稳定性问题的预测和调控提供借鉴。上述研究成果对于高应力条件下类似的地下洞室群含错动带岩体的稳定性研究具有重要的参考价值和指导意义。
The underground caverns under construction in Baihe Beach are huge in scale and have the characteristics of “high-side walls, long-span, high-ground stress and complicated geological conditions.” During the unloading of high-stress excavation, they encounter ductility and mechanics The nature of a number of large-scale dislocation of the impact of the belt, with the fault zone rock mass encountered varying degrees of deformation and failure problems. Based on the data of geology, construction, monitoring, testing and numerical analysis, the engineering characteristics of the dislocation zone are firstly discussed in detail from the aspects of the occurrence, origin and characteristics of the dislocation zone. Then, Deformation failure or failure of the examples are summarized, from the structural control factors will be divided with fault zone rock mass containing fault zone into plastic extrusion tensile failure, structural stress collapse / shear and sliding shear damage 3 Secondly, study on the destruction characteristics and mechanism of various types of rock mass containing fault zone, including the evolution process of space-time, the morphological characteristics and the scale of destruction, reveal the mechanical mechanism corresponding to the three kinds of failure mode; finally, Analysis and prediction of fractured rock mass with fault zone and the example of its support, so as to provide reference for the prediction and regulation of the instability of rock mass containing the fault zone in the construction of the Baihetan underground powerhouse. The above research results have important reference value and guidance significance for the stability research of similar underground cavern group containing fault zone with high stress.