为了保证钻孔的有效性,对钻孔孔周煤岩力学响应特征进行研究十分有必要。研究通过构建钻孔数值模型,通过侧压系数表征复杂应力条件引起的应力分布差异,探究不同侧压系数下钻孔孔周力学响应特征。研究结果表明:在钻孔刚刚形成时,应力水平较低,力链分布均匀。在钻孔周围煤体的应力场调整后,钻孔的力链分布不均,出现应力集中现象。孔周位移场呈“碟叶”分布状,随着侧压系数的增加,钻孔孔周煤岩垂直方向与水平方向的应力水平均逐渐增加,垂直位移与水平位移也逐渐增大。当侧压系数小于1.0时,裂隙主要沿水平方向扩展,而当侧压系数大于1.0时,裂隙主要集中在垂直方向。本研究为钻孔的稳定性提供了理论参考。

In order to ensure the effectiveness of drilling, it is necessary to study the mechanical responsecharacteristics of coal and rock around the drilling hole. A numerical model of drilling holes was constructed, thestress distribution differences caused by complex stress conditions through lateral pressure coefficients werecharacterized, and the mechanical response characteristics around drilling holes were explored under differentlateral pressure coefficients. The research results indicated that at the beginning of drilling, the stress level was lowand the force chain distribution was uniform. After adjusting the stress field of the coal body around the borehole,the force chain distribution of the borehole is uneven, resulting in stress concentration. The displacement fieldaround the borehole shows a disc-shaped distribution. As the lateral pressure coefficient increases, the stress levelsin the vertical and horizontal directions of the coal rock around the borehole gradually increase, and the vertical andhorizontal displacements also gradually increase. When the lateral pressure coefficient is less than 1. 0, cracksmainly propagate horizontally, while when the lateral pressure coefficient is greater than 1. 0, cracks mainlyconcentrate in the vertical direction. A theoretical reference for the stability of drilling was provided.