地应力对含裂隙岩体爆破影响分析研究

随着深部开采环境逐渐复杂,为实现安全高效的工程爆破施工,针对深部开采爆破作业所面临的高地应力和穿越破碎带的问题展开分析研究.运用有限元分析软件ANSYS-LS/DYNA中的隐式-显式耦合分析程序对双向等压、双向不等压下含裂隙岩体进行数值模拟,研究高地应力区对含裂隙、弱面等岩体进行爆破开挖这一特殊工况.研究结果表明:深部...

Influence Analysis of Ground Stress on Blasting of Fractured Rock Mass

As the deep mining environment becomes increasingly complex,the problems of high ground stress and passing through fracture zones were analyzed and studied in order to achieve safe and efficient deep mining blasting construction.The implicit and explicit coupling analysis program in the finite element analysis software ANSYS-LS/DYNA was used to simulate the fractured rock mass under bidirectional equal pressure and bidirectional unequal pressure.Then,this program was used to study blasting excavation in the special condition of fractured rock mass with weak plane under high ground stress.The research results show that during the blasting mining process of deep fractured rock mass,the tensile stress of the unit gradually decreases with the increase of the confining pressure,but the compressive stress of the unit does not increase significantly in an isobaric in-situ stress field in all directions.At the same time,the compressive stress of the element near the right side of the crack reaches the peak value of the survey line,and the compressive stress increases with the confining pressure.In anisotropic stress field environment,the tensile stress of the survey line in the hole and crack area reaches its peak value when the lateral pressure coefficient is 1.33.Therefore,in the process of deep mining and blasting,attention should be paid to the in-situ stress field in the fracture zone including cracks,which has a significant impact on the safe and efficient implementation of blasting excavation.