岩体失稳过程中的声发射监测研究

摘要

对大红山铜矿岩样进行了单轴压缩和劈裂试验,研究岩样在加载过程中的声发射特征.同时,对该矿2个盘区进行了盘区顶板的声发射监测,探索岩体的破坏机理和预测破坏的方法.根据室内试验与1a多的现场监测发现,室内岩样破坏过程中声发射特性与现场监测中出现的点柱垮落、采场顶板冒落现象的声发射参数规律相似.声发射活动从平静到剧增且维持较长时间的变化可视为岩体失稳的前兆信息之一.%In order to investigate the characteristics of acoustic emission( AE)during the loading process,both uniaxial compressive and Brazilian tests of rock samples from Dahongshan copper mine were performed. Both the failure mechanism and the failure prediction of rock mass in-situ AE monitoring on panels of the mine were also studied. Similar rules were found from AE characteristics of rock failure indoor and pillar caving failure and stope roof failing in situ monitoring. The changes of AE activity from quiet to long-term abrupt could be regarded as one of forewarnings for the failure of rock mass.