【摘要】 基于声波测试原理,利用RSM-SY5智能型声波仪,对厂坝铅锌矿某巷道围岩在爆破动荷载作用下产生的累积损伤效应进行了现场试验研究。研究表明:既有开挖爆破对巷道围岩的影响深度为0.8～1.2 m,根据钻孔的深度,在3.5～4.8 m深度的岩体内进行爆破累积损伤效应研究是可行的;随着爆破次数的不断增加,岩体声波速度逐渐降低,损伤度D呈现出非线性累积规律;随着与爆源距离的增大,岩体爆破损伤程度减小,累积损伤效应逐渐变得不明显;水平和垂直方向测试结果存在较大差异,说明爆破作用下岩体损伤具有各向异性的特征。爆破装药位置和药量对岩体损伤累积规律有一定的影响。装药区段范围内的岩体损伤程度最严重,装药量越大,岩体损伤程度也越大。测试成果为进一步的岩体力学参数研究和地下洞室稳定性分析提供了参考依据。更多还原

【Abstract】 Cumulative damage effect of surrounding rock in some gallery in Changba Lead-zinc Mine was studied by in-situ tests on sound waves,using RSM-SY5 intelligent sound wave apparatus,based on the sound wave measuring theory.It was shown that the damage depth of surrounding rock caused by old blasting excavation was 0.8～1.2 m,and researches on cumulative damage effect within 3.5～4.8 m were feasible according to the depth of boring holes.The acoustic wave velocity gradually decreased with the increasing of blasting times,and the damage degree(D) presented a rule of non-linear cumulation.The blasting damage degree decreased with the increasing of distance,and gradually became indistinct.The measured horizontal results were different from those of vertical,which illuminated that damage of rock mass under blasting load was anisotropic.The charge and its position could influence the damage cumulative rules of rock mass.The damage degree of rock mass within the range of charging was most severe.And the more the charge was,the more severe the damage degree of rock mass was.The test results provided references for the researches on mechanical parameters of rock mass and the stability analysis of underground chambers.更多还原