Formation mechanism and engineering geological significance of structural plane at a dam region located in the southwest of China
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摘要: 通过对坝区断层和层间错动带发育规律研究,认为这两类结构面形成受控于构造和浅表生改造。从分析区域构造特征和地层岩性入手,探讨了结构面的构造成因,并建立其构造成因模式,断层类结构面属于共轭剪切破裂基础上的逆冲模式;层间错动带属于纵弯梁的剪切滑脱模式。通过对坝区结构面浅表生改造的分析,揭示了结构面的性状变化规律,断层类结构面表现出厚度、物质类型及性状的分段性特点。Abstract: Based on studying the development of fault and interlayer shear zone in the dam region, it is suggested that the formation of these two kinds of structures plane was controlled by tectonic and epigenetic reworking. This paper analyzes district structure characteristic and strata lithology first, discusses structure origin of the plane, and builds up its structure origin pattern. The fault structure plane belongs to the overthrust pattern on the foundation of conjugate shear outbursts, and the interlayer shear zone belongs to the surge pattern of vertical camber beam. Based on the analysis of epigenetic reworking of the structure plane, the character and state changing law of structure plane is revealed. The fault structure plane displays thickness, material type and character segmentation.
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Key words:
- district structure /
- fault /
- interlayer shear zone /
- epigenetic reworking
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