【摘要】 用Instron1342材料试验机对表面含二、三、四锯齿状人工节理试样进行4种不同频率载荷下的动态压缩试验。通过对试验结果的分析,获得加载频率和表面形态对节理闭合变形性质的影响规律。通过5种常用函数方程对节理动态压缩试验数据的拟合,发现用幂函数模型来描述人工节理动态压缩闭合变形性质较好。根据试验数据,得出模型参数与载荷频率之间的关系,从而建立考虑率效应的节理本构模型,并进行试验验证。更多还原

【Abstract】 Dynamic compression tests of different loading frequencies on artificial joints with different saw-teeth are performed by Instron1342 servo-controlled material testing machine.Based on the analysis of test results,the effect of both the surface topography and loading frequency on the joint closure behavior is discussed.By comparison of the fitting potential of five empirical functions with the closure curves of rock joints under normal loads with different frequencies,it is suggested that the power function is very suitable for expressing the dynamic closure behavior of the joints.By analyzing the quantitative relations between the fitting parameters of power function and strain rates,a new dynamic constitutive model of rock joints is proposed.The test results show that the established model gives reasonable estimations of the deformation behavior of joints under dynamic loads.更多还原