松散煤体声发射特征与损伤本构模型  

Acoustic emission characteristics and damage constitutive model of soft coal

作　　者：徐遵玉[1,2] XU Zun-yu(CCTEG Chongqing Research Institute,Chongqing 400037,China;State Key Laboratory of the Gas Disaster Detecting,Preventing and Emergency Controlling,Chongqing 400037,China)

机构地区：[1]瓦斯灾害监控与应急技术国家重点实验室,重庆400037 [2]中煤科工集团重庆研究院有限公司,重庆400037

出　　处：《煤炭工程》2022年第9期112-116,共5页Coal Engineering

基　　金：重庆市自然科学基金面上项目(cstc2021jcyj-msxmX1149)。

摘　　要：为量化研究松散煤体损伤破坏过程,针对淮南矿区煤体,采用型煤代替原煤,开展了压缩状态下煤体声发射特征监测试验,以累积AE计数定义损伤变量D,研究了煤体损伤演化特征,随轴向应变的增加,煤体损伤变量呈现平稳,缓慢增长,快速增长再平稳的变化趋势。推导出煤体本构关系表达式,并对理论本构模型的合理性进行验证,采用理论本构模型求得的全应力-应变曲线与试验结果相吻合,理论应力值与试验值平均绝对误差仅为0.126MPa,实现了松散煤体应力-应变关系的理论描述。研究成果可为揭示松散煤体破坏失稳力学响应特征、防控失稳灾害提供实验和理论依据。In order to quantify the damage and failure process of soft coal body,for the coal body in Huainan mining area,using briquette instead of raw coal,the acoustic emission characteristics of coal body is monitored under compression,and the damage variable D is defined by cumulative AE counts.The damage evolution characteristics of coal body are studied.With the increase of axial strain,the damage variable of coal body shows a trend of stable,rising slowly,rising rapidly and then stable.The expression of coal constitutive relationship is deduced,and the rationality of the theoretical constitutive model is verified.The total stress-strain curve obtained by the theoretical constitutive model is consistent with the test results.The average absolute error between the theoretical stress value and the test value is only 0.126MPa,which theoretically describes the stress-strain relationship of soft coal.The research results can provide experimental and theoretical basis for revealing the mechanical response characteristics of failure and instability of soft coal,thus to prevent and control instability disasters.

关 键 词：松散煤体 单轴压缩 声发射 损伤变量 本构模型 

分 类 号：TD313[矿业工程—矿井建设]