Based on the knowledge of the shallow-level mylonitization of detrital rocks and intrusive rocks,the poorly-known cataclastic rheology of carbonate rocks is discussed compre-hensively in this paper.The cases taken fro...Based on the knowledge of the shallow-level mylonitization of detrital rocks and intrusive rocks,the poorly-known cataclastic rheology of carbonate rocks is discussed compre-hensively in this paper.The cases taken from eastern China are analyzed in various aspects including ductile-brittle fault zone,rock texture and structure,clastomylonite layer,leucocratic stress minerals,and frictional dynamometamorphism.It is proposed that the cataclastic flow structure represented by clastomylonite texture is a cooling pattern of flow assemblage charac-terized by cooling metamorphism,cooling mylonite and cooling stress minerals.Such a pattern is formed generally in mildly reducing physicochemical environments,and is commonly related to regional tectonism and mesothermal and epithermal mineralization.展开更多
安县大光包滑坡是汶川地震触发的最大规模滑坡,滑坡南侧暴露长约1.8 km顺层滑带,其岩体高度碎裂化,引起广泛关注。为准确评价滑带碎裂岩体的强度参数,笔者在前人研究的基础上开展了细致的野外调查工作,采用法国Phicometre岩土两用原位...安县大光包滑坡是汶川地震触发的最大规模滑坡,滑坡南侧暴露长约1.8 km顺层滑带,其岩体高度碎裂化,引起广泛关注。为准确评价滑带碎裂岩体的强度参数,笔者在前人研究的基础上开展了细致的野外调查工作,采用法国Phicometre岩土两用原位钻孔剪切试验仪对大光包滑坡滑带碎裂岩体进行了原位剪切试验。将试验结果与Hoek–Brown岩体强度准则估值和基于工程地质类比法的力学参数建议值进行了对比分析。基于以上研究,提出了大光包滑坡南侧顺层滑带碎裂岩体力学参数建议值:内聚力为245~480 k Pa,内摩擦角为25.0°~26.5°。展开更多
基金the Ntional Natural Science Foundation of China(Grant Nos.40372092,40373024,40172067,40172034)the State Key Laboratory of Geology and Exploitation Engineering of Petroleum Reservoir
文摘Based on the knowledge of the shallow-level mylonitization of detrital rocks and intrusive rocks,the poorly-known cataclastic rheology of carbonate rocks is discussed compre-hensively in this paper.The cases taken from eastern China are analyzed in various aspects including ductile-brittle fault zone,rock texture and structure,clastomylonite layer,leucocratic stress minerals,and frictional dynamometamorphism.It is proposed that the cataclastic flow structure represented by clastomylonite texture is a cooling pattern of flow assemblage charac-terized by cooling metamorphism,cooling mylonite and cooling stress minerals.Such a pattern is formed generally in mildly reducing physicochemical environments,and is commonly related to regional tectonism and mesothermal and epithermal mineralization.
文摘安县大光包滑坡是汶川地震触发的最大规模滑坡,滑坡南侧暴露长约1.8 km顺层滑带,其岩体高度碎裂化,引起广泛关注。为准确评价滑带碎裂岩体的强度参数,笔者在前人研究的基础上开展了细致的野外调查工作,采用法国Phicometre岩土两用原位钻孔剪切试验仪对大光包滑坡滑带碎裂岩体进行了原位剪切试验。将试验结果与Hoek–Brown岩体强度准则估值和基于工程地质类比法的力学参数建议值进行了对比分析。基于以上研究,提出了大光包滑坡南侧顺层滑带碎裂岩体力学参数建议值:内聚力为245~480 k Pa,内摩擦角为25.0°~26.5°。
