基于数字图像相关方法预钻孔煤样破裂特性研究

Study on Burst Characteristics of Pre-drilled Coal Specimen Based on Digital Image Correlation Method

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 - drilled coal and rock, the non - contact field strain measurement system was used to test the horizontal pre - drilling coal samples, and the fracturing regularity of boreholes was explored in different stages. The results show that the DIC can effectively capture the deformation and rupture of speckle number has the corresponding relation with and cracked in the process of cracking. The initial rock mass, due to the internal structure of different, stress, resulting in different forms of damage, and the coal sample, and the variation curve of the the loading curve. The coal rock mass is inclined fracture is the shear slippage within the coal and under the action of compressive stress and tensile coal rock carrying capacity is mainly reduced its internal material of the shear slip caused by.