标题：Fissure evolution of weak-cemented jurassic overburden induced by multiple-seam mining: a case study in Western China
作者：Meng L.; Fan D.; Liu X.; Li Y.
作者机构：[Meng, L] College of Economics and Management, Shandong University of Science and Technology, Qingdao, China;[ Fan, D] State Key Laboratory of Mining 更多
通讯作者地址：[Liu, X] College of Economics and Management, Shandong University of Science and TechnologyChina;
来源：Energy Sources, Part A: Recovery, Utilization and Environmental Effects
关键词：coal pillar; empirical equation; numerical simulation; Overburden fissure; regression analysis
摘要：The coal seams in western China are predominantly formed in the lower Jurassic, with generally low strength and poor cementability, which are markedly different from the coal seams in eastern China. In addition, mining layout has an important impact on the fissure development pattern and height in weak-cemented overburden. Thus, investigating the relationship between fissure development pattern and mining layout is of great significance to mining safety. In this study, the mechanical properties of coal and rock strata in no. 3 mining area of Saier Mine, Xingjiang, China, were tested. And a numerical simulation was performed by using the Universal Distinct Element Code (UDEC) distinct element numerical simulation software. The different working face layout schemes were performed to investigate the variation patterns of overburden fissure development height, and coal pillar stress and deformation. The simulation results indicate that as the δW (ratio of the working face width to coal pillar width) increases, the fissure development height gradually increases and the coal pillar horizontal displacement, vertical stress, and horizontal stress first decrease and then increase. Four empirical equations for computing the fissure development height and the horizontal displacement, vertical stress, and horizontal stress of coal pillars were obtained by using the regression analysis method. What is more, all the correlations between the above independent variables and δW can be expressed as quadratic functions. The equations can not only be used as reference criteria for the working face layout design of A3 coal seam in no. 3 mining area of Saier Mine, but also are of great guiding significance to the safety of multiple-seam mining actions under confined water in western China. © 2019, © 2019 Taylor & Francis Group, LLC.