中文摘要：

矿山开采过程中,围岩容易受到掘进爆破等动态扰动作用而产生失稳破坏。为此,使用Blast-UM型爆破测振仪对新城金矿Ⅳ#矿体-680 m中段开采过程中的爆破震动信号进行监测,利用小波变换技术将监测信号转换为应力波形,利用自行研制的摆锤冲击加载SHPB试验装置,通过改变锤头的形状和控制锤头的冲击速度,以获得与监测波形较为相似的加载波形,对取自-680 m中段花岗岩试样进行动态巴西盘试验。研究结果表明：花岗岩的动态抗拉强度随着冲击速度的增大而增大,并表现出明显的应变率效应。试样沿着加载直径方向呈现劈裂破坏模式,与入射杆、透射杆接触面处的“V”字型破坏区随着冲击速度的增大而趋于明显。所设计的试验装置为测试巷道围岩的动态破坏机理提供了一种有效的试验手段。

英文摘要：

Surrounding rocks are easily happened to be instable and failure by dynamic loadings during mining activities. Therefore, the blasting vibration system （Blast-UM model） is adopted to monitor the data in -680 m Section of IV# Ore Body in Xincheng Gold Mine and the data are transferred to stress wave by the wavelet transferring technique. The self-de- signed Pendulum-impact SHPB apparatus is used to do the dynamic Brazilian test using granite samples taken from -680 m section and obtain similar stress wave with blasting monitor by changing impact-hammers shape and loading velocity. The test results show that dynamic tensile strength of the granite samples increase with the impact velocity increases, obviously showing to be strain-rate effect. The granite samples were finally separated into two halves along the loading diameter. But the V-shaped failure zone at the contact area between the incident and transmitted bars and the rock specimen becomes larger with the in- crease of the impact velocity. The designed test apparatus can offer an effective way to study the mechanism of surrounding rock failure.