煤矿安全2019，Vol.50Issue(11)：67-71,5.DOI:10.13347/j.cnki.mkaq.2019.11.015
基于主应力差影响的底板应力分布状态研究
Study on Stress Distribution State of Floor Based on the Influence of Principal Stress Difference
摘要
Abstract
In order to study the influence of coal pillar in the upper coal seam on the stress transfer law of the floor rock, the"principal stress difference"is introduced innovatively as a dynamic index for the strata bearing state. It takes the place of the traditional methods of vertical stress, horizontal stress and shear stress, and gets rid of the research status that traditional models cannot quantitatively describe the degree of deformation and failure of coal and rock mass. In this paper, based on the traditional model research, the stress distribution state of the three stresses is obtained. Then the characteristic and solution formula of"prin-cipal stress difference"are further analyzed. Finally, the solution model shows that the transfer form of the principal stress differ-ence on the floor is"fan-shaped diffusion", and the stress curve in the shallow strata within 20 m of the floor is"double peak". With the increase of buried depth, the curve gradually changes to a"single peak shape", and the principal stress difference at the lower seam roof presents single peak, and the damage degree of the center line of the coal pillar floor is the largest.关键词
近距离煤层/半平面理论/主应力差/扇形扩散状/岩体变形破坏/底板应力Key words
close coal seams/ half plane theory/ principal stress difference/ fan-shaped diffusion/ rock mass deformation failure/floor stress分类
矿业与冶金引用本文复制引用
何富连,郑铮,杨增强,郭延定,朱恒忠..基于主应力差影响的底板应力分布状态研究[J].煤矿安全,2019,50(11):67-71,5.基金项目
国家自然科学基金资助项目(51574243) （51574243）
中国矿业大学(北京)越琦杰出学者奖励计划资助项目(800015Z1138) （北京）
中央高校基本科研业务费专项资金资助项目(800015J6) （800015J6）
