黄金科学技术 ›› 2020, Vol. 28 ›› Issue (4): 558-564.doi: 10.11872/j.issn.1005-2518.2020.04.180
Chunhui SONG1(),Xianglong LI1,2(),Jianguo WANG1,Fei SONG3
摘要:
为确定井下矿柱爆破回采对胶结充填体的破坏范围,选用大红山铜矿现场胶结充填体及同等强度的矿柱模拟材料,在井下废弃但安全的巷道内开展矿柱爆破回采模型试验,并采用超声波测试及爆后表观裂纹观测的方法,分别从损伤度变化和裂纹扩展2个方面探究爆破荷载下胶结充填体的损伤规律。研究结果表明:爆破荷载下胶结充填体在爆心距为45~125 cm的损伤度明显高于爆心距为145~205 cm的损伤度;胶结充填体处裂纹最长可扩展至71.5 cm;根据试验模型中胶结充填体损伤情况,将其划分为稳定区、损伤区和破坏区,该配比下胶结充填体损伤度0≤D<0.07为稳定区,0.07≤D≤0.22为损伤区,0.22<D≤1为破坏区。
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