Full-Text Search:
Home|Journal Papers|About CNKI|User Service|FAQ|Contact Us|中文
《Coal Science and Technology》 2018-05
Add to Favorite Get Latest Update

Improvement of prediction method for heights of caving zone and fractured zone induced by repeated mining of contiguous coal seams

LIU Shiqi;XU Yanchun;GUO Wenyan;HU Xiaolong;School of Resources and Safety Engineering,China University of Mining and Technology(Beijing);Hebei State Key Laboratory of Mine Disaster Prevention,North China Institute of Science and Technology;Institute of Coal Strategy and Planning,China Coal Research Institute;  
In order to solve the inaccurate problems of calculation results of combined mining height( M_Z) formula derived from‘ mining regulations under water,railway and buildings',to contiguous seams group when the distance between the upper and lower coal seam is large,based on the mining-induced subsidence law and time effect,the authors put forward prediction method of height of "two zones"( caving zone and fractured zone) to two or more layers of contiguous coal seams. The results show that,according to the mining height( M),caving zone's height( H_k) and interlayer's distance( h),the contiguous coal seams group can be divided into close contiguous coal seams( Mh≤H_k) and ultra contiguous coal seams( 0≤h≤M). The converted mining height( M_(ZS)) of contiguous coal seams group,is composed by the coal seam mining height added the conversion mining height calculated by its upper seam thickness and the seams distance,and time factor must be considered in this situations. The estimating method and formula of the heights of"two zones"are proposed based on M_(ZS) with three steps,firstly deciding the type of coal seam group,secondly calculating converted mining height,lastly estimating the heights of"two zones"of contiguous coal seams. The application practice verifies that this new method is more reasonable and effective and will contribute to the enhancement of mining safety and efficiency under water bodies.
【Fund】: 国家重点基础研究发展规划资助项目(973计划)(2013CB227903);; 河北省矿井灾害防治重点实验室开放基金资助项目(KJZH2017K04)
【CateGory Index】: TD823
Download(CAJ format) Download(PDF format)
CAJViewer7.0 supports all the CNKI file formats; AdobeReader only supports the PDF format.
©2006 Tsinghua Tongfang Knowledge Network Technology Co., Ltd.(Beijing)(TTKN) All rights reserved