【摘要】 G23挤压蚀变破碎带是某水电站坝基的主要工程地质问题。通过对该水电站枢纽区新构造运动及构造体系特征的综合分析,探讨了G23挤压蚀变破碎带的成因机制。基于典型岩样的物相及微形貌试验成果,分析了G23带构造岩的岩性特征,明确了G23带岩体的物理性质及其转变特征,预测了该挤压蚀变破碎带在工程作用下的变化趋势。结合蚀变岩样三轴压缩试验的变形破坏规律,阐述了G23带对工程作用的响应及其对工程的影响。更多还原

【Abstract】 The G23 mylonitization and fractured belt located in the dam-foundation of a hydropower station is a main engineering geological problem of the project.Its genesis mechanism has been analyzed based on the characteristics of the new tectonic movement and the tectonic system.With the X-ray diffraction and scanning micrograph analysis,the main mineral components and microstructures of either the fractured rock or the phyllonite are identified.With the conventional triaxial compression testes,the stress-strain characteristic of G23 belt rock is examined.In conjunction with site specific analyses,the pre-existing state of rock mass in G23 belt is expounded.At last,based on physico-mechanical properties,the mass rock’s engineering characteristics are estimated;the influences of the G23 belt are discussed;and the main problems which should be study further are put forward.更多还原