高地应力下白鹤滩地下洞室群含错动带岩体破坏模式及机制研究

发布时间：2019-06-04 17:25

【摘要】：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。
[Abstract]:The underground caverns under construction in Baihetan are huge in scale and have the characteristics of "high side wall, long span, high ground stress and complex geological conditions". In the process of high stress excavation and unloading, Due to the influence of many large dislocation zones with strong extensibility and poor mechanical properties, the rock mass with dislocation zone encounters different degrees of deformation and failure. Combined with geological, construction, monitoring, testing and numerical analysis data, the engineering characteristics of staggered zone are discussed in detail from the aspects of occurrence, cause and characteristics of staggered zone. Then the examples of deformation failure or failure of engineering rock mass caused by dislocation zone are summarized, and the failure mode of rock mass with dislocation zone is divided into plastic extrusion tensile failure from the point of view of structural control factors. There are three types of structural stress collapse / block falling and shear slip failure. Secondly, the failure characteristics and mechanisms of all kinds of rock mass with dislocation zone are studied and analyzed, including the temporal and spatial evolution process, morphological characteristics, failure scale and so on, and the corresponding mechanical mechanisms of the three failure modes are preliminarily revealed. Finally, a typical example of rock mass failure mode analysis and support in Baihetan underground powerhouse is given, which can be used for reference for the prediction and control of rock mass instability in Baihetan underground powerhouse. The above research results have important reference value and guiding significance for the study of rock mass stability in similar underground caverns with dislocation zone under high stress conditions.
【作者单位】：中国科学院武汉岩土力学研究所岩土力学与工程国家重点实验室;东北大学深部金属矿山安全开采研究中心;中国长江三峡集团公司;
【基金】：国家自然科学基金国际合作重大项目(41320104005);国家自然科学基金重点项目(11232024);国家自然科学基金青年基金项目(51309219)~~
【分类号】：TU452

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