含交叉裂隙岩石试样单轴力学特性与破坏机理

为系统性地研究节理岩体在单轴压缩试验条件下其力学特性及破坏机理,利用MTS-815岩石试验装置对完整岩石试样、不同构型单裂隙和交叉裂隙岩石试样进行单轴压缩试验,分析了各构型试样的力学参数及能量演化规律。与完整岩石试样力学参数相比,含单裂隙岩石试样的强度和弹性模量相对较小,含交叉裂隙岩石试样各项参数值最小。在加载过程中,含交叉裂隙岩石试样用于裂纹产生及发展的耗散能远大于完整岩石试样和含单裂隙岩石试样。一般地,含交叉裂隙岩石试样裂纹从预制交叉裂隙尖端起裂,首先贯通同侧预制裂隙形成反翼型裂纹,最终呈拉伸劈裂型破坏。

Uniaxial Mechanical Properties and Failure Mechanism of Rock Specimens Containing Cross Fissures

In order to systematically investigate the mechanical properties and failure mechanism of jointed rock masses under uniaxial compressive test conditions, MTS-815 rock test device was used to perform uniaxial compression on intact rock specimens, rock specimens containing single fissure and cross fissures with different configurations test. The mechanical parameters and energy evolution of each configuration specimen are analyzed.Compared with the mechanical properties of the intact rock specimens, the strength and elastic modulus of the rock specimens containing single fissure are relatively small, while the corresponding counterparts of the rock specimens containing cross fissures are the smallest. During loading process, the dissipated energy used for crack generation and propagation of rock specimens containing cross fissures is higher than that of both intact rock specimens and rock specimens containing single fissure. Generally, the cracks of rock specimen with cross fissures emerge from the tip of preexistingcross fissures, and grow through the same sides of cross fissures forming an anti-wing crack, featuring a tensile splitting failure.