论文部分内容阅读
为了对相似材料的声发射特性进行研究,选取沙子作为骨料,水泥及淀粉作为胶结剂,水为溶剂来制作ACSW-SGC(Amylum淀粉,Cement水泥,Sand沙子,Water水,Solid固体,Gas气体,Couple耦合)相似材料,利用YYW-II及声发射测试仪对ACSW-SGC相似材料试件单轴压裂过程的声发射特性开展研究。结果表明:声发射能量释放与试件压缩过程中裂隙发育之间存在着密切的联系,经历了储存能量阶段、弹性能释放阶段、破裂能量释放阶段、二次破裂能释放阶段及能量平衡阶段;相似材料主裂隙产生在骨胶比由1∶10~1∶50过程中随淀粉含量的不断增大,其释放能量的平均变化率为5.85%~9.83%,而淀粉含量为0~50 g时随着骨胶比的不断变大,其释放能量的平均变化率为-5.92%~-3.78%;试件主裂隙产生释放的能量随着试件抗压强度的不断增大而变大,而且变化同步性较好。为深入开展采动覆岩破断与瓦斯运移的“固-气”耦合物理相似模拟实验提供了测试基础。
In order to study the AE characteristics of similar materials, ACSW-SGC (Amylum starch, Cement cement, Sand sand, Water water, Solid solid, Gas gas was made by using sand as aggregate, cement and starch as binder and water as solvent , Couple coupling), the acoustic emission characteristics of uniaxial fracturing of ACSW-SGC specimens with similar materials were studied by using YYW-II and acoustic emission tester. The results show that there is a close relationship between the energy release of acoustic emission and the development of fractures in the process of specimen compression. The energy storage, energy release, fracture energy release, secondary rupture energy release and energy balance have been studied. The main fissures of similar materials with the increasing of the content of starch in the range of 1:10 to 1:50, the average rate of change of the released energy is 5.85% ~ 9.83%, while with the content of 0 ~ 50 g The ratio of bone glue to glue becomes larger and the average rate of change of the released energy is -5.92% -3.78%. The energy released by the main fracture of the specimen increases with the increase of the compressive strength of the specimen, and the changes are synchronized Sex is better. It provides a test basis for further study on the physical simulation of “solid-gas” coupled mining overburden rock failure and gas migration.