非对称不耦合装药结构对预裂爆破效果的影响

发布时间：2018-02-25 07:21

本文关键词： 预裂爆破装药结构不耦合系数炮孔间距数值模拟　出处：《爆破》2017年03期 　论文类型：期刊论文

【摘要】：为降低爆破开挖对保留区岩体的损伤,采用数值模拟的方法,研究不同装药结构对预裂爆破效果的影响,发现相比于中心单药卷和偏心双药卷,偏心单药卷装药结构下的预裂缝成型效果最佳,且其炮孔壁上的爆炸荷载在保留区一侧较小,在开挖区一侧较大,能在降低爆破开挖对保留区岩体损伤的同时将爆炸能量更多的作用于开挖区岩体。基于偏心单药卷装药结构,在综合考虑预裂缝成型效果和保留区岩体损伤程度的情况下,通过数值模拟的方法研究了爆破参数对预裂爆破效果的影响,结果表明:在不耦合系数为1.68,炮孔间距为70 cm的条件下,预裂爆破效果最佳。
[Abstract]:In order to reduce the damage caused by blasting excavation on the rock mass in reserved area, the effect of different charge structure on pre-splitting blasting effect is studied by numerical simulation. It is found that compared with central single charge coil and eccentric double charge coil, Under the structure of eccentric single charge package charge, the precrack forming effect is the best, and the explosion load on the wall of the hole is smaller in the reserved area and larger in the excavation area. It can reduce the damage caused by blasting excavation to the reserved rock mass, at the same time, the explosion energy can act more on the rock mass in the excavation area. Based on the eccentric single charge packed charge structure, considering the effect of pre-crack molding and the damage degree of rock mass in reserved area, the effect of pre-crack molding and the damage degree of rock mass in reserved area can be taken into account. The effect of blasting parameters on pre-splitting blasting effect is studied by numerical simulation. The results show that the pre-splitting blasting effect is the best under the condition that the uncoupling coefficient is 1.68 and the hole spacing is 70 cm.
【作者单位】：武汉理工大学道路桥梁与结构工程湖北省重点实验室;武汉理工大学土木工程与建筑学院;武汉地震工程研究院;中国葛洲坝集团三峡建设工程有限公司;
【基金】：湖北省自然科学基金重点项目(2015CFA136) 国家自然科学基金资助项目(51274157);国家自然科学基金青年项目(51309183、51609183)
【分类号】：TB41

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