煤的厚度对煤岩组合体物理力学特征的影响规律分析  

Analysis of the influence of coal thickness on the physical and mechanical characteristics of coal and rock mass

作　　者：李回贵 位乐 李化敏[3] LI Huigui;WEI Le;LI Huamin(School of Mining Engineering,Guizhou University of Engineering Science,Bijie 551700,China;CCTEG Chongqing Research Institute,Chongqing 400037,China;School of Energy Science and Engineering,Henan Polytechnic University,Jiaozuo 454000,China)

机构地区：[1]贵州工程应用技术学院矿业工程学院,贵州毕节551700 [2]中煤科工集团重庆研究院有限公司,重庆400037 [3]河南理工大学能源科学与工程学院,河南焦作454000

出　　处：《矿业安全与环保》2020年第6期48-53,共6页Mining Safety & Environmental Protection

基　　金：高层次人才科研启动基金项目(院科合字G2018011);贵州省教育厅自然科学基金项目(黔教合KY字[2019]166);国家自然科学基金重点项目(U1261207);贵州省重点学科矿业工程学科项目(ZDXK[2016]13)。

摘　　要：为了研究煤岩组合体中煤的厚度对其物理力学特征的影响规律,以布尔台煤矿粗粒砂岩、煤和煤岩组合体试样为研究对象,利用RMT-150C力学试验机对各试样的单轴抗压强度、弹性模量及峰值应变进行研究。研究结果表明,煤岩组合体中煤的厚度对其密度和波速有显著的影响,煤岩组合体的波速和密度随着煤的厚度增大而逐渐减小;煤的厚度对煤岩组合体的单轴抗压强度影响较小,但对其峰值应变和弹性模量有显著的影响。与粗粒砂岩相比,在煤岩组合体中的煤厚为5、10、15、20 mm时,峰值应变分别增大了2.2%、20.7%、25.3%、38.3%,峰值应变随着煤岩组合体中煤的厚度的增大而逐渐增大;弹性模量分别降低了30.5%、41.5%、48.2%、51.8%,弹性模量随着煤岩组合体中煤的厚度的增大而逐渐减小。研究成果有助于进一步揭示巷道支护困难、矿压显现剧烈,以及地表台阶下沉等现象的内在原因。In order to study the influence of coal thickness on the physical and mechanical characteristics of coal and rock mass,the samples of coarse grained sandstone,coal,as well as coal and rock mass in Bultai Coal Mine were taken as the research objects.The uniaxial compressive strength,elastic modulus and peak strain were studied by RMT-150C mechanical testing machine.The results show that the coal thickness has a significant effect on the density and wave velocity of coal and rock mass,with the increase of the coal thickness,the density and wave velocity of coal and rock mass decrease gradually;the coal thickness has little effect on the uniaxial compressive strength of coal and rock mass,but has significant effect on its peak strain and elastic modulus.Compared with coarse grained sandstone,when the coal thickness in coal and rock mass are 5 mm,10 mm,15 mm and 20 mm,the peak strain increases by 2.2%,20.7%,25.3% and 38.3% respectively,the peak strain increases with the increase of the coal thickness in the coal and rock mass;the elastic modulus is reduced by 30.5%,41.5%,48.2% and 51.8% respectively,the elastic modulus decreases with the increase of coal thickness in coal and rock mass.The research results are helpful to further reveal the internal reasons of the phenomenon such as roadway support difficulties,rock pressure appears violently,and surface step subsidence and so on.

关 键 词：煤岩组合体 煤 粗粒砂岩 物理力学特征 单轴压缩 弹性模量 峰值应变 

分 类 号：TD315[矿业工程—矿井建设]