Experimental study on the movement law of overlying rock non-pillar coal overhead mining  

作　　者：LI Yong ZHENG Jing WANG Feng-nian MA Xin-gen ZHANG Rui-xue SUN Ying-ying YIN Jian-bin TAO Zhi-gang 

机构地区：[1]College of Geoscience and Surveying Engineering,China University of Mining and Technology-Beijing,Beijing 100083,China [2]State Key Laboratory of Coal Resources and Safe Mining,China University of Mining and Technology-Beijing,Beijing 100083,China [3]Shanxi Provincial Transportation Technology Research and Development Co.Ltd.,Key Laboratory of Highway Construction and Maintenance Technology in Loess Area,Transportation Industry,Taiyuan 030000,China [4]Huaneng Coal Technology Research Co.Ltd.,Beijing 10o83,China [5]State Key Laboratory for Geo Mechanics and Deep Underground Engineering,China University of Mining and Technology-Beijing,Beijing 10083,China [6]School of Mechanics and Civil Engineering,China University of Mining and Technology-Beijing,Beijing 100083,China

出　　处：《Journal of Mountain Science》2023年第6期1759-1773,共15页山地科学学报（英文）

基　　金：the National Natural Science Foundation of China(No.42272204);the Fundamental Research Funds for the Central Universities(Grant No.2021JCCXDC02);the Gansu Province Science and Technology Major Project(19ZD2GA005)for their support;financially supported by the State Key Laboratory for Geomechanics and Deep Underground Engineering(SKLGDUEK2020);Huaneng Group headquarters science and technology project(HNKJ21-H07);the Coal Burst Research Center of Jiangsu,China。

摘　　要：Pillarless coal mining technology is a new practical technology.Based on the compensating mechanical behavior of the Negative Poisson’s Ratio(NPR)anchor cable on the roof,the roadway was successfully retained by the top cutting and pressure relief technology.This study utilizes the Digital Speckle Monitoring(DIC monitoring),stress-strain monitoring,and infrared thermal imaging systems to conduct physical model experiment of similar materials from the displacement,stress-strain,and temperature fields to investigate in depth the fracture change law of the overlying rock.In addition,it uses FLAC3D numerical simulation to invert the surface displacement settlement.The results show that the non-pillar overhead mining under the 110 mining method has little influence on the rock crack in the middle of the coal seam,and the crack development area is mainly concentrated in the overlying rock mass of the upward coal seam.The compensatory mechanical behavior of NPR anchor cable and the dilatation characteristics of rock mass have a good effect of retaining roadway along goaf,and can also reduce surface settlement.The 110 mining method provides a scientific basis for ecological environment protection and the development of other kilometer deep soft rock high ground stress underground projects.

关 键 词：No pillar mining Overhead mining NPR anchor cable Physical model of similar materials FLAC3D Numerical simulation Motion of overburden 

分 类 号：TD823.48[矿业工程—煤矿开采]