单向围压作用下切缝药包爆破爆生裂纹扩展规律的研究  

Expanding law of cracks formed by slotted cartridge blast under unidirectional confining pressure

作　　者：岳中文[1,2] 田世颖 张士春[1] 宗亮亮 徐胜男 YUE Zhongwen;TIAN Shiying;ZHANG Shichun;ZONG Liangliang;XU Shengnan(School of Mechanics&Civil Engineering,China University of Mining&Technology(Beijing),Beijing 100083,China;State Key Laboratory for Geomechanics and Deep 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：《振动与冲击》2019年第23期186-195,共10页Journal of Vibration and Shock

基　　金：国家自然科学基金面上项目(51374210);爆炸科学与技术国家重点实验室开放基金(KFJJ17-01M)

摘　　要：为了研究单向围压作用下切缝药包爆破爆生主裂纹的动态力学行为,采用新型数字激光动态焦散线实验系统开展多组爆破光测实验,同时使用LS-DYNA有限元软件分析初始应力对爆炸应力场的影响。结果表明:裂纹的扩展方向和延伸长度受控于切缝角度和压力的共同作用,当压力垂直和平行切缝方向时,分别能够抑制和促进爆生主裂纹的萌生及演化,降低和提升扩展速度及动态应力强度因子,当压力与切缝成一定角度时,主裂纹偏向压力方向扩展,动态力学参数减小。数值分析结果显示,当压力分别垂直和平行切缝方向时,初始围压静加载在环向形成压缩和拉伸预应力,能够降低和提高爆炸冲击在环向的拉伸作用,从而削弱和增强爆炸荷载的冲击致裂能力。In order to study dynamic mechanical behavior of main cracks formed by slotted cartridge blast under unidirectional confining pressure,a new digital-laser dynamic caustic line test system was used to perform multi-set blast light-measurement tests.At the same time,the FE software ANSYS/LS-DYNA was used to analyze effects of initial pressure on the blast stress field.The results showed that crack propagation direction and expanding length are controlled by combined action of slit angle and confining pressure;when pressure is vertical or parallel to direction of slit,combined action can suppress or boost initiation and evolution of main cracks formed by blast,and reduce or raise crack expanding speed and dynamic stress intensity factor;when pressure is at a certain angle with slit,main cracks tend to expand in pressure direction and dynamic mechanical parameters decrease;when unidirectional pressure is vertical or parallel to direction of slit,initial confining pressure static loading produces compression or tension stress in circumferential direction to reduce or raise tensile action of blast impact in circumferential direction,and reduce or raise blast load’s impact and crack-forming ability.

关 键 词：切缝药包 围压 动态焦散线 数值模拟 

分 类 号：TD235.373[矿业工程—矿井建设]