摘要
为了增强爆破卸压效果,运用岩石爆破内部作用理论,分析了软岩巷道爆破卸压的作用过程以及其影响因素,设计了爆破卸压效果现场测试系统.结果表明,爆破卸压具有硬化软岩、形成爆扩空腔和裂隙区,最终形成卸压区,并使高地应力转移到距巷帮R以远围岩深部的特征.适当加大炮孔直径、提高装药密度、选择爆速高的炸药,使炮孔间距满足L≥2R2,并尽可能减少炮孔深度,均可提高爆破卸压效果.
The theory of confined blasting was used to analyze the factors influencing how destress blasting in a soft-rock tunnel can relieve pressure in the rock. A test system to determine the pressure relief from blasting was designed. Blasting hardens soft rock by forming a blast cavity and fracture zone. This creates a de-stressed area and transfers geo-stresses into the surrounding rock some distance, R, from the wall of the roadway. The pressure relief may be improved by appropriately enlarging the borehole diameter, changing the charge density, using explosives with high detonation velocity, spacing the boreholes so L is greater than, or equal to, 2R and by reducing the borehole depth as far as is possible.
出处
《中国矿业大学学报》
EI
CAS
CSCD
北大核心
2010年第1期50-54,共5页
Journal of China University of Mining & Technology
基金
国家自然科学基金项目(50674083)
关键词
爆破卸压
爆扩空腔
裂隙区
卸压区
应力转移
destrss blasting
blast induced cavity
fracture zone
distressed zone
stress transferring
