受载相似材料单裂隙影响下损伤空间发展过程分析  

Analysis of Damage Development Process Under Influence of Single Fracture of Loaded Similar Materials

作　　者：成小雨 CHENG Xiaoyu(China Coal Energy Research Institute Co.,Ltd.,Xi'an 710054,China)

机构地区：[1]中煤能源研究院有限责任公司,陕西西安710054

出　　处：《煤矿安全》2020年第11期263-268,共6页Safety in Coal Mines

摘　　要：为了揭示煤岩动力灾害物理模拟的细观机制,利用YYW-Ⅱ相似材料单轴压缩实验仪及PCIE-8声发射(AE)监测系统,测试了含不同长度单裂隙的相似材料试样,在单轴压缩条件下的损伤空间发展过程,进而分析了单裂隙长度对相似材料损伤空间发展过程的影响规律。结果表明,单裂隙长度由30 mm增大到50 mm,预制单裂隙区域逐渐增大的张拉应力造成的损伤和破坏,对试样损伤空间发展的主导作用逐渐增强,即主要损伤由中部单裂隙区域产生和集中,并向试样顶部和底部不断发展贯通;同时,裂隙对相似材料破坏形态的影响增大,其主导破坏形态逐渐由自身剪切破坏演变为贯穿裂隙中部的纵向张拉破坏;AE事件定位结果可准确描述相似材料损伤空间发展过程。In order to reveal the meso-damage mechanism of physical simulation of coal and rock dynamic disasters,using YYW-Ⅱuniaxial compression tester and PCIE-8 acoustic emission(AE)monitoring system,the damage space development of samples with different lengths of pre-fabricated single fracture under uniaxial compression are investigated.The results show that with the increase of fracture length from 30 mm to 50 mm,the increasing tensile stress in the prefabricated single fracture area causes tensile damage,and its leading effect on the damage space development of the sample is gradually enhanced,that is,the main damage is produced and concentrated in the central single fracture region,and continuously develop to the top and bottom of the sample.The dominant failure mode of the sample gradually changed from shear failure to longitudinal tensile failure through the middle of prefabricated single fracture.

关 键 词：预制裂隙 相似材料 破坏特征 声发射定位 损伤发展 

分 类 号：TD315[矿业工程—矿井建设]