摘要
为了研究不同煤体高度煤岩组合体的蠕变扰动特性,运用岩石流变扰动效应试验系统,进行了煤岩组合体的单轴压缩蠕变扰动试验,并采用ABAQUS对试验结果进行了数值模拟验证;结果显示,煤体与岩体高度比1∶4、1∶2和2∶1的3种组合体进入强度极限邻域内的阈值分别为30、25、20 MPa,对应的强度极限右邻域阈值宽度分别为5、3、2 MPa。试验结果表明:低应力水平下,外界扰动不会对煤岩组合体的整体破坏产生较大影响,而在高应力水平下,组合体受外界扰动影响较大;组合体长期强度随煤体高度增加不断减小,且随扰动次数增加,组合体整体逐渐由脆性破坏转变为延性破坏;只有进入强度极限邻域内时,煤岩组合体才对外界扰动较为敏感,且煤体高度越高,扰动次数越多,组合体整体进入强度极限邻域内的阈值越低,强度极限右邻域阈值宽度也越小。
In order to study the creep disturbance characteristics of coal-rock combination body with different coal body heights,the uniaxial compression creep disturbance test of coal-rock combination body was carried out by using the rock rheological disturbance effect test system,and the test results were verified by ABAQUS numerical simulation.The test results show that the thresholds of the three kinds of combination bodies with coal and rock mass height ratios of 1∶4,1∶2 and 2∶1 entering into the strength limit neighborhood are 30 MPa,25 MPa and 20 MPa,respectively,and the corresponding strength limit right neighborhood threshold widths are 5 MPa,3 MPa and 2 MPa,respectively.The test results show that under the low stress level,the external disturbance does not have a great impact on the overall failure of the coal-rock combination body,while under the high stress level,the combination body is greatly affected by the external disturbance;the long-term strength of the combination body decreases with the increase of coal height,and with the increase of disturbance times,the whole combination body gradually changes from brittle failure to ductile failure;the coal-rock combination body is more sensitive to external disturbances when it only enters the strength limit neighborhood,and the higher the coal height,the more the number of disturbances,the lower the threshold of the combination body entering the strength limit neighborhood as a whole,and the smaller the threshold width of the right neighborhood of the strength limit.
作者
黄子康
李准
王继超
马世纪
杨雨默
HUANG Zikang;LI Zhun;WANG Jichao;MA Shiji;YANG Yumo(China Coal Research Institute,Beijing 100013,China;State Key Laboratory of Coal Mine Disaster Prevention and Control,Beijing 100013,China;Beijing Engineering and Research Center of Mine Safe,Beijing 100013,China;School of Emergency Technology and Management,North China Institute of Science and Technology,Sanhe 101601,China;Ordos Haohua Hongqingliang Mining Co.,Ltd.,Ordos 014300,China)
出处
《煤矿安全》
CAS
北大核心
2024年第12期39-47,共9页
Safety in Coal Mines
基金
国家自然科学基金资助项目(52274121,52034009)
河北省自然科学基金资助项目(E2022508023)。
关键词
煤岩组合体
蠕变扰动
数值模拟
扰动敏感阈值
强度极限邻域
coal-rock combination body
creep disturbance
numerical simulation
disturbance sensitive threshold
strength limit neighborhood
