高应力状态下穿过层理爆破致裂的动态行为研究  

Blast cracking of borehole-crossed bedding under high stress condition

作　　者：杨仁树[1,2] 丁晨曦[1] 杨立云[1] YANG Renshu;DING Chenxi;YANG Liyun(School of Mechanics and Civil Engineering, China University of Mining and Technology（Beijing）, Beijing 100083, China;State Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining and Technology（Beo＇ing）, Beo＇ing 100083, China)

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

出　　处：《岩石力学与工程学报》2018年第4期801-808,共8页Chinese Journal of Rock Mechanics and Engineering

基　　金：国家重点基础研究发展计划(973)项目(2016YFC0600903);国家自然科学基金资助项目(51404273)~~

摘　　要：为了研究高应力状态下炮孔穿过层理爆破的裂纹起裂、扩展等动态力学行为,结合动态焦散线方法,采用数字激光动态焦散线实验系统,开展实验室模型实验。结果表明:炮孔穿过层理爆破时,爆生气体能量难以得到有效利用,炮孔周边岩石的破碎效果不甚理想。爆炸应力波对层理端部裂纹的起裂和扩展前期的动力学行为起主导作用,静态应力则对裂纹扩展后期的行为特征产生主要影响。层理走向与静态应力方向之间的夹角对试件的破坏形态和爆生主裂纹的动态应力强度因子、扩展速度等具有明显影响。此外,随着该夹角的增加,爆生主裂纹的扩展时间和沿层理位移均减小,最大偏转角度增大,扩展路径更加曲折。In order to study the dynamic behavior of crack initiation and propagation of borehole-crossed bedding blasting under the high stress condition,the experimental system of digital laser dynamic caustics is used to carry out laboratory model experiments together with the dynamic caustics method. The results show that in the blasting with the borehole cross the bedding,the blasting gas energy is difficult to be efficiently utilized,resulting in the unsatisfactory crushing effect of the rock around borehole. The blasting stress wave plays a dominant role in the initiation and the early period of propagation of crack at the end of bedding,while the static stress has a major effect on the behavior of crack during later propagation. The angle between the bedding direction and the static stress direction has a significant effect on the fracture mode of specimen, the dynamic stress intensity factor and the propagating velocity of the main crack. In addition,with the increasing of the angle, the propagating time and displacement along the bedding direction decrease,but the maximum deflecting angle increases,the propagating path becomes more flexural.

关 键 词：爆破工程 高应力状态 层理 爆破 裂纹 焦散线 

分 类 号：TD235[矿业工程—矿井建设]