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为研究预钻孔煤岩的破裂特性,采用非接触性全场应变测量系统,对水平预钻孔煤样进行了单轴压缩试验,分阶段分区域探究钻孔围岩破裂规律。研究结果表明:DIC能够对煤样变形破裂进行全程有效捕捉,散斑数的变化曲线与加载曲线具有相互对应的关系;煤岩体在破裂的过程中呈现倾斜劈裂和“X”状的破裂方式,初始破裂均为煤岩体内部的剪切滑移,由于内部构造不同,在压应力和拉应力的作用下,造成不同的破坏形式,并且煤岩体承载能力的降低主要是其内部材料的剪切滑移造成的。
In order to study the rupture characteristics of pre-bored coal and rock, a uniaxial compression test was carried out on the horizontal pre-bored coal sample using non-contact full field strain measurement system. The results show that DIC can effectively capture the entire deformation and fracture of coal samples, and the relationship between the curve of speckle number and load curve has a corresponding relationship with each other. The coal and rock mass body presents the inclined splitting and “X” shape during the fracture process , The initial rupture is the shear slip within the coal and rock mass. Due to the different internal structures, under the action of compressive and tensile stress, different forms of failure are caused, and the reduction of the carrying capacity of the coal and rock mass is mainly due to its Shearing slip of internal material.