爆炸载荷下邻近巷道围岩裂纹贯穿过程研究  

Study on Crack Penetration Process of Surrounding Rock of Adjacent Roadway under Blast Loading

作　　者：刘康[1] 郭东明[1,2] 张英实 马有宝 陈亮亮 LIU Kang;GUO Dong-ming;ZHANG Ying-shi;MA You-bao;CHEN Liang-liang(School of Mechanic & Civil Engineering, China University of Mining & Technology, Beijing 100083 ,China;State Key Laboratory of Deep Rock and Soil Mechanics and Underground Engineering, Beijing 100083 ,China)

机构地区：[1]中国矿业大学(北京)力学与建筑工程学院,北京100083 [2]深部岩土力学与地下工程国家重点实验室,北京100083

出　　处：《爆破》2019年第2期26-32,共7页Blasting

基　　金：国家重点研发计划(2017YFC0804204-04);国家自然基金面上项目(51274204)

摘　　要：围岩中原有裂纹扩展贯穿是爆炸载荷下巷道围岩破坏的主要表现形式,为了更清楚地了解围岩中原有裂纹的扩展贯穿机理,采用动态焦散线实验系统进行了详细研究。研究结果表明:爆生气体准静态应力与削弱的应力场叠加产生主应力差峰值,以弧形波的形式作用于邻近巷道围岩主裂纹,并驱动主裂纹的快速扩展及与原有裂纹的贯穿。主裂纹与原有裂纹贯穿伴随着能量的叠加和传递,表现为贯穿后原有裂纹的起裂、扩展,且扩展速度增加,而能量的叠加和传递,使得原有裂纹起裂扩展所需的能量释放率减小。主裂纹与原有裂纹的贯穿微观上表现为应力场作用下主裂纹与原有裂纹间形成带状拉应力集中区,带状应力集中区域微裂纹被激活、连通,形成损伤演化带,爆生主裂纹最终沿损伤演化带与原有裂纹贯穿。The original crack propagation in surrounding rock is the main manifestation of the surrounding rock failure under the explosion load.In order to explore the extension mechanism of the original crack,the dynamic caustic line test system was adopted.Results show that the superposition of quasi-static stress from explosive gas and weakened stress field generates the peak value of the principal stress difference,which induces the main crack of the surrounding rock with arc wave.The main crack was driven to expand rapidly and penetrated with the original crack.The main crack and the original crack were accompanied by the superposition and transmission of energy,which was characterized by the cracking and expansion of the original crack after the penetration,accompanied with increased expansion speed.The superposition and transmission of energy inducing the original crack cracking and expansion got reduced.The penetration of the main crack and the original crack were characterized by a band-shaped tensile stress concentration zone between the main crack and the original crack.The micro-cracks in the band stress concentration region were activated and connected to form a damage evolution zone.The main crack finally passed through the damage evolution zone and the original initiates.

关 键 词：爆炸载荷 邻近巷道 裂纹贯穿 能量叠加 能量传递 

分 类 号：TD23[矿业工程—矿井建设]