白云岩SHPB试验中破坏形态与能耗关系分析

Analysis on Relationship between Damage Characteristic and Energy Consumption of Dolomite Specimen in SHPB Experiment

白云岩属于沉积岩,与完整性好的花岗岩相比,存在节理、裂隙、空洞等明显自然缺陷。利用ф100 mm大口径SHPB设备对一组白云岩试件进行了冲击试验。试验结果统计分析表明:因存在明显自然缺陷,破坏形态与打击速度之间没有一一对应关系,但与试件耗能大小密切相关,耗能越多,破坏程度越严重;试件在加卸载的一个往复中应力-应变曲线所包围的面积大小与试件耗能统计结果是一致的。这进一步解释了试件耗能的物理机制。

Dolomite belongs to sedimentary rocks. It has obvious natural defects,such as joints,cracks and cavities,etc.,compared with the intact granite. A set of dynamic tests of dolomite specimens is carried out by using a ф100 mm large diameter SHPB device. The statistical results of SHPB tests show that there are not one-to-one correspondence relationships between the damage characteristic and impact velocity because of rock natural defects,but there are such relationships between damage characteristic and energy consumption. If the more energy is consumed,the damage degree is more serious. The statistical results also show that the area surrounded by loading-unloading curve in one loop is agreed with the energy consumption,which further explains the physical mechanism of energy consumption.