护壁爆破机理及动焦散试验  

Double-pipe Protecting Borehole Wall Balsting Mechanism and Dynamic Caustics Test

作　　者：蒲传金[1] 郭学彬[1] 肖正学[1] 张志呈[1] 刘一伟[1] 

机构地区：[1]西南科技大学环境与资源学院,四川绵阳621010

出　　处：《有色金属》2009年第2期114-118,133,共6页Nonferrous Metals

基　　金：四川省绵阳市科技局资助项目([1999]16号);西南科技大学重大科技成果培育基金项目(2006)

摘　　要：针对光面爆破和定向断裂控制爆破在岩石开挖工程中存在的问题,采用动焦散线法研究护壁爆破过程。结果表明,爆破后光面护壁爆破和切缝护壁爆破护壁面基本上不产生裂纹,临空面方向产生3条以上裂纹,预定开裂方向产生长而直的裂纹,护壁方向应力强度因子大大小于临空面方向。光面护壁爆破和切缝护壁爆破对护壁面一侧介质都有明显的保护作用,能最大限度的维持其完整性。With consideration for resolving the problems existing in conventional smooth blasting and directional fracture controlled blasting, the double-pipe protecting borehole wall balsting process is investigated by dynamic caustics meassures. The results indicate that protecting face with smooth blasting and cutting seam cartridge blasting of double-pipe protecting borehole wall almost has no giving birth to crack. Crack numbers are beyond 3 in non-protecting face. A long and straight crack can come forth in the predetermined breaking direction. Stress intensity factor in protecting face much smaller than that in non-protecting face. Both smooth and cutting seam cartridge blasting of double-pipe protecting borehole wall have obvious protecting effect for medium of protecting face. It can furthest protect its integrality.

关 键 词：爆破工程 护壁爆破 动焦散 

分 类 号：TD235.3[矿业工程—矿井建设] TD235.4