轴向静载压缩作用下深部砂岩的变形破坏规律  

Deformation and Failure of Deep Sandstone under Axial Static Compression

作　　者：张翼飞 朱明礼[1] 张红成 陈嘉 李起航 雷彬彬 ZHANG Yifei;ZHU Mingli;ZHANG Hongcheng;CHEN Jia;LI Qihang;LEI Binbin(School of Energy Science and Engineering,Henan Polytechnic University,Jiaozuo 454003,China)

机构地区：[1]河南理工大学能源科学与工程学院,河南焦作454003

出　　处：《有色金属工程》2024年第6期116-124,共9页Nonferrous Metals Engineering

基　　金：河南省重点研发与推广专项(科技攻关)项目(222102320011)。

摘　　要：为探究深部砂岩的变形破坏规律,建立塑性区发育、裂纹扩展情况和声发射特征之间的关系。以深部砂岩岩样为研究对象,开展轴向静载压缩声发射试验,并采用数值模拟分析岩样塑性区和内部裂纹的演化规律。结果表明:内部能量密度在压密和弹性阶段耗散比较平稳,塑性阶段耗散能逐渐增大,在破坏前瞬间全部释放。塑性区、裂纹和声发射特征间具有很强的关联性,压密阶段振铃计数、能量均是先增大后减小,弹性阶段前处于平静期,塑性区和微裂纹均从岩样两端侧面出现。弹性阶段,振铃计数和能量继续增大,后者涨幅大于前者,塑性区沿对角线向内发育,裂纹数量增多。塑性阶段,振铃计数持续增大,能量激增,塑性区向外发育。破坏阶段,振铃计数和能量均出现激增,模拟试验为“y”状剪切裂纹,与实际破坏裂纹形态一致。To investigate the deformation and failure law of deep sandstone,the relationship between plastic zone development,crack propagation and acoustic emission(AE)characteristics is established.Taking deep sandstone samples as the research object,the axial static compression AE test is carried out,the evolution law of plastic zone and internal crack of rock samples is analyzed by numerical simulation.The results show that the dissipation of internal energy density is relatively stable in the compaction and elastic stage,gradually increases in the plastic stage,and all the energy is released immediately before failure.There is a strong correlation between the plastic zone and crack AE characteristics.The ringing count and energy increase first and then decrease in the compaction stage.Before the elastic stage,the plastic zone and micro-cracks appear from both sides of the rock sample.In the elastic stage,the ringing count and energy continue to increase,the increase of the latter is greater than that of the former,the plastic zone develops diagonally inward,and the number of cracks increases.In the plastic stage,the ringing count continues to increase,the energy surges,and the plastic zone develops outwards.In the failure stage,both the ringing count and energy surge,and the simulation test shows a y-shape shear crack,which is consistent with the actual failure crack.

关 键 词：深部砂岩 声发射特征 裂纹形态 塑性区 变形破坏规律 

分 类 号：TD313[矿业工程—矿井建设]