摘要
针对光面爆破和定向断裂控制爆破存在的对围岩较严重损伤破坏的问题,提出了护壁爆破新技术,包括光面护壁爆破和切缝护壁爆破,并对其装药结构、爆破过程、护壁套管力学效应进行了详细分析.在有机玻璃模型上进行的动态应变测试结果表明,光面护壁爆破护壁面方向比临空面方向的应变峰值降低45.31%,切缝护壁爆破护壁面方向比临空面和切缝方向应变峰值分别降低12.38%和70.96%,临空面方向比切缝方向应变峰值降低66.85%.分析爆破后的有机玻璃模型发现,光面护壁爆破护壁面方向基本上没有形成裂纹,临空面方向形成裂纹较多,长度较长;切缝护壁爆破技术的护壁面和临空面方向都形成3条呈对称分布的裂纹.2种爆破技术的预定开裂方向都形成了一条长而直的主裂纹,说明该方向有能量集中效应.
Smooth blasting and cutting seam cartridge blasting of pipe protecting borehole wall （ SBPPBW, CSCBP- PBW） were put forward, which aimed at resolving the problems existing in conventional blasting, smooth blasting and directional breaking controlled blasting. Charge structure, blasting process and mechanics effect of pipe protecting borehole wall were detailedly analysed. Text results of dynamic strain on organic glass model show that dynamic strain peak value of protecting borehole wall face decreases 45.31% compared to air face for SBPPBW. Dynamic strain peak value of protecting borehole wall face respectively decreases 12.38% and 70.96% compared to air face and cutting seam face, air face decreases 66. 85% compared to cutting seam face for CSCBPPBW. Studying organic glass model after blasting finds that cracks aren＇ t shaped in protecting borehole wall face and more long cracks are shaped in air face for SBPPBW. Three symmetrical cracks are shaped in protecting borehole wall face and air face for CSCBPPBW. A long and straight crack is shaped in preconcerted destructive face for two techniques, it indicates that this direction has concentration phenomena of energy.
出处
《煤炭学报》
EI
CAS
CSCD
北大核心
2008年第10期1163-1167,共5页
Journal of China Coal Society
关键词
动态应变测试
光面护壁爆破
切缝护壁爆破
text of dynamic strain
smooth blasting of pipe protecting borehole wall （SBPPBW）
cutting seamcartridge blasting of pipe protecting borehole wall （CSCBPPBW）
