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预应力锚索是岩土工程中常用也是效率比较高的一种支护形式。采用有限元分析方法和ADINA软件,岩体在加载和卸载条件下,其力学特性有本质的区别。重点分析了在卸荷条件下,预应力锚索同一数量不同倾角的变化对岩体变形参数如变形模量和泊松比的影响,不同倾角对岩体位移变形量的约束程度。提供了一种有效且比较符合工程实际的计算方法,等效变形参数法。这种方法可以算出含有节理的岩体的变形模量和泊松比,以及加有锚索后岩体的变形模量和泊松比。
Prestressed anchor cable is commonly used in geotechnical engineering is also a relatively efficient form of support. Using finite element analysis and ADINA software, the mechanical properties of the rock mass are essentially different under loading and unloading conditions. The influence of different inclination angles of prestressed anchor cables on deformation parameters of rock mass such as deformation modulus and Poisson’s ratio and the degree of restraint of displacement and deformation of rock mass under different loading conditions are analyzed emphatically. Provides an effective and more in line with the engineering practice of the calculation method, the equivalent deformation parameter method. This method can calculate the deformation modulus and Poisson’s ratio of jointed rock mass, and the deformation modulus and Poisson’s ratio of rock mass after adding anchor.