片岩损伤裂隙系统生成及裂隙率间接定量表征方法研究

在岩石试验机上对标准片岩试件进行轴向预压，使试件内部微裂隙自由扩展、连通，以模拟工程扰动形成的损伤裂隙系统．采用纵波波速间接定量表征片岩试件的损伤，从而得到含有一定损伤裂隙系统的标准片岩试件，用于研究经受一定损伤作用后岩石的物理、力学等特性．对预压后的试样进行冻融循环试验，并对不同冻融损伤状态下的试件进行超声波测试和单轴压缩。经非线性回归分析发现，纵波波速和单轴抗压强度之间相关性显著．研究方法和成果对于岩石损伤的定量表征和含一定损伤岩石试件的制备具有指导意义．

Generation of Damage Fracture System and Indirect-Quantitative Characterization of Fracture Ratio to Schist

Standard rock specimen of schist was axially pre-pressed by rock testing machine, microfissure in rock specimen was expanded and connected freely, in order to simulate damage fracture system caused by engineering disturbance. Schist specimen damage was characterized by longitudinal wave velocity indirectly and quantitatively, then, standard schist specimen contains certain damage fracture system was obtained, it can be used to study physical and mechanical characteristics of the rock experienced certain damage. Freeze-thaw cycles test was taken to the pre-pressed specimen, then, longitudinal wave velocity test and uniaxial compress were taken to the above specimens in different states of frozen or thawed . Through nonlinear regression analysis, the result shows, it has significant correlation between longitudinal wave velocity and uniaxial compressive strength. The method and result of above research has guiding significance for quantitative characterization of rock damage and preparation of rock specimen with certain damage.