Relationship between joint development in rock and coal seams in the southeastern margin of the Ordos basin

作     者：Wang Linlin Jiang Bo Wang Jilin Qu Zhenghui Li Pei Liu Jiegang 

作者机构：School of Resources and GeoscienceChina University of Mining & Technology Ministry of Education Key Laboratory of CBM Resources and Reservoir Formation ProcessChina University of Mining & Technology 

出 版 物：《International Journal of Mining Science and Technology》 (矿业科学技术学报（英文版）)

年 卷 期：2014年第24卷第2期

页      面：219-227页

核心收录：

学科分类：081901[工学-采矿工程] 0709[理学-地质学] 0819[工学-矿业工程] 0808[工学-电气工程] 081803[工学-地质工程] 08[工学] 0818[工学-地质资源与地质工程] 0708[理学-地球物理学] 0807[工学-动力工程及工程热物理] 0815[工学-水利工程] 0813[工学-建筑学] 0814[工学-土木工程] 

基　　金：Financial support for this work  provided by the National Science and Technology Major Project (No. 2011ZX05034-001) 

主　　题：鄂尔多斯盆地 煤层厚度 联合发展 岩石 联合密度 南缘 联合测量 联合系统 

摘      要：To predict joint development characteristics of coal seams, joint characteristics of rock seams from 88field stations were observed and comparisons were made between joint characteristics of coal and rock seams at 10 coal outcrops. Additionally, detailed joint measurements of underground coal seams were taken at two coal mines. This study investigated the effects of seam thickness, lithology, and structure on joint development and established the relationship between joint development of coal and rock seams, which allowed predictions of predominant joint densities for the No.5 coal seam in the southeastern margin of the Ordos basin. The results show that outcrop and underground coal seams exhibit the same joint systems as rock seams. The joints are mainly upright. Predominant joints strike 55° on average, followed by joints striking 320°. The joint density of the coal seam is 18.7–22.5 times that of the sandstone seam at the same thickness. The predominant joint density of the No.5 coal seam, controlled by the structure, is 4–20 joints per meter. Joint densities exhibit high values at intersecting areas of faults and folds and decrease values in structurally stable areas. The permeability increases exponentially with increasing density of the predominant joints.