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岩体在风化过程中,其物理力学性质会随着风化程度的不同有所差异。结合均质岩体中压力型锚索受力特点,以及内部对称荷载作用下横观各向同性弹性体内的剪应力分布特点,推导出了压力型锚索在横观各向同性弹性岩体内的剪应力分布方程。假定风化岩体为横观各向同性弹性体,其弹性模量及剪切模量均按指数函数变化,分析结果表明:①由于风化岩体的弹性模量随着深度的变化,锚索锚固段的剪应力也随着岩体的弹性模量的增加(减小)而增加(减小);②在承压板附近,锚索锚固段的剪应力随锚索孔半径的增加而减小,由于风化岩体剪切模量的变化,因而导致剪应力的变化量很大;③在承压板附近,锚索锚固段接触面上的剪应力随着垂直于岩体横向等向面的剪切模量的改变而相应的改变。研究成果可为实际工程中压力型锚索设计提供参考。
Rock mass in the weathering process, its physical and mechanical properties will vary with the degree of weathering vary. Combined with the characteristics of pressure-type anchor cable in homogeneous rock and the distribution of shear stress in transversely isotropic elastic body under internal symmetrical load, the stress-type anchor cable is deduced in transversely isotropic elastic rock mass The shear stress distribution equation. Assuming that the weathered rock mass is a transversely isotropic elastic body, the elastic modulus and the shear modulus of the rock mass change exponentially, and the results show that: (1) Since the elastic modulus of the weathered rock mass varies with depth, The shear stress of the segment increases (decreases) as the elastic modulus of the rock mass increases (decreases). ② In the vicinity of the bearing plate, the shear stress of the anchor segment decreases with the increase of the anchor hole radius Due to the change of shear modulus of weathered rock mass, the change of shear stress is very large. (3) In the vicinity of the pressure plate, the shear stress on the contact surface of the anchorage section of the anchor cable changes with the vertical plane Changes in shear modulus change accordingly. The research results can provide a reference for the design of pressure-type anchor cable in practical engineering.