空孔孔径对深部岩石爆破裂纹扩展影响规律的数值模拟研究  

Numerical Simulation Study on the Influence Law of Empty Hole Diameter on Blasting Crack Propagation in Deep Rock

作　　者：谢二伟 孙得志 郭俊庆[1] 杨永康[1] 李明祥 刘亚龙 XIE Erwei;SUN Dezhi;GUO Junqing;YANG Yongkang;LI Mingxiang;LIU Yalong(Key Laboratory of In-situ Modified Mining of Ministry of Education,Taiyuan University of Technology,Shanxi,Taiyuan 030024,China;Jinan Lixia Holding Group Co.,Ltd.,Jinan,Shandong 250013,China;Shaanxi Yanchang Oilfield Co.,Ltd.,Yulin,Shaanxi 718600,China)

机构地区：[1]太原理工大学原位改性采矿教育部重点实验室,山西太原030024 [2]济南历下控股集团有限公司,山东济南250013 [3]陕西延长油田股份有限公司,陕西榆林市718600

出　　处：《矿业研究与开发》2023年第7期116-122,共7页Mining Research and Development

基　　金：山西省应用基础研究计划面上项目(20210302123148);山西省重点研发计划项目(201803D31051);山西省应用基础研究项目面上自然基金项目(201801D121034).

摘　　要：针对深部岩石炮孔与空孔间裂纹扩展方向性差的问题,以山西永宁煤矿10204切顶卸压沿空留巷为工程背景,运用LS-DYNA有限元动力模拟软件,研究空孔孔径对岩石应力分布、孔间爆生裂纹扩展及峰值有效应力的影响规律,并进行了现场验证。研究结果表明:随着空孔直径的增大,最大主应力值与范围增大,且最大主应力方向在整个炮孔连线方向不发生改变,使得孔间裂纹扩展更具有定向性;随着空孔孔径的增大,孔间裂纹扩展长度呈现出由快速增长趋于稳定的规律;侧压力系数小于1.0时,空孔直径的增大对孔间有效应力的影响较小;侧压力系数大于1.0时,空孔直径的增大可有效提高孔间峰值有效应力。Aiming at the problem of poor directionality of crack propagation between deep rock blast holes and empty holes,taking 10204gob-side entry retaining with roof cutting and pressure releasing in Shanxi Yongning Coal Mine as the engineering background,the LS-DYNA finite element dynamic simulation software was used to study the influence of empty hole diameter on rock stress distribution,crack propagation caused by inter hole explosion and peak effective stress,and field verification was carried out.The results show that with the increase of empty hole diameter,the maximum principal stress value and range increase,and the direction of the maximum principal stress does not change in the direction of the whole hole connection,which makes the crack propagation between the holes more directional.With the increase of empty hole diameter,the crack propagation length between holes tends to be stable from rapid growth.When the lateral pressure coefficient is less than 1,the increase of empty hole diameter has little effect on the effective stress between the holes.When the lateral pressure coefficient is greater than 1,the increase of empty hole diameter can effectively increase the peak effective stress between the holes.

关 键 词：岩石爆破 空孔孔径 数值模拟 裂纹扩展 有效应力 

分 类 号：TD235.33[矿业工程—矿井建设]