不同充填度岩石分形节理抗剪强度的数值模拟

在对岩石节理进行分形模拟的基础上,建立了岩石分形充填节理直剪试验数值分析模型,采用数值模拟方法,研究了充填度与岩石分形充填节理抗剪强度之间的关系。结果表明,随着充填度的增大,分形节理抗剪强度总体上呈非线性减小。当充填度小于1时,随着充填度的增大,分形节理抗剪强度迅速减小,节理抗剪强度受节理表面形态、充填物力学性质以及壁岩力学性质的共同影响;当充填度大于1时,节理抗剪强度主要受充填物力学性质的控制,强度参数接近于节理充填物的强度参数。

Numerical simulation on the shear strength of fractal rock joints with different filling percentage

Based on the fractal simulation of rock joints,numerical models for direct shear test of fractal rock joints were established,and the relationship between filling percentage and shear strength of fractal rock joints was studied by using the numerical simulation method.The results showed that the shear strength of fractal joints decreases nonlinearly as the filling percentage increased.When the filling percentage is less than 1,the shear strength of fractal joint decrease rapidly as the filling percentage increases,and the shear strength is controlled by the joint profiles and the mechanical property of rock and filling material.When the filling percentage is bigger than 1,the shear strength is controlled by the mechanical property of filling material,and the value of shear strength parameters approach to the value of shear strength parameters of filling material.