填充对节理岩体力学特性及能量演化的影响研究

能量耗散引起节理岩体裂纹启裂、扩展、贯通及最终的破坏。为探寻充填对节理岩体力学及能量特性的影响，基于岩石能量耗散理论及单轴压缩试验结果，研究了充填对节理岩体强度特征、变形特征、破坏模式及能量演化的影响机制。此外，分析了节理岩体的能量演化机制及峰值点各能量指标( 总能量、弹性应变能及耗散能) 的充填效应。研究结果表明: 节理使得岩样的力学参数明显劣化，而充填使得节理岩样的峰值强度、峰值应变及弹性模量均有所增大; 完整岩样损伤演化划分为初始损伤阶段、稳定损伤阶段、损伤平稳阶段、加速损伤阶段及损伤破坏阶段，而节理岩样和充填节理岩样则分为六阶段，即增加了突变损伤阶段; 完整岩样、充填节理岩样及节理岩样峰值点的平均弹性应变能依次在减小，但减小幅度明显降低。研究成果可为岩体工程类环境灾害的预警与防控提供科学依据。

Study on impact from filling on mechanical properties and energy evolution of jointed rock mass

In order to explore the impact from filling on the rock mechanical and energy characteristics of jointed rock mass，the mechanism of the impact from filling on the strength characteristics，deformation characteristics，failure modes and energy evolution of jointed rock mass is studied herein in accordance with the energy dissipation theory of rock and the relevant uniaxial compression test results. Additionally，the energy evolution mechanism of the jointed rock mass and the filling effect on all the energy indexes( total energy，elastic strain energy and dissipated energy) at the peak value points are analyzed as well. The study results show that the obvious degradation of the mechanical parameters of rock sample are to made by joints，while the filling makes all the peak strength，peak strain and elastic modulus of the jointed rock sample be increased to some extent. The damage evolution of intact rock sample can be divided into five stages，i. e. the initial damage，stable damage，stationary damage，accelerated damage and damage failure，while the damage evolution of the jointed rock sample and the rock sample with filled joint can be divided into six stages，i. e. one more stage of mutational damage being added; The mean elastic strain energy at the peak points of intact rock sample，the rock sample with filled joint and the jointed rock sample decreases gradually in turn，but the decreasing amplitude is obviously lowered. The study result can provide a scientific basis for the early warning and control of the rock engineering environmental disaster.