特厚煤层工作面长度对矿压显现的影响  

Influence of Length of Working Face in Extra-thick Coal Seam on Strata Behaviors

作　　者：车禹恒 朱志洁[2] 

机构地区：[1]中煤科工集团重庆研究院有限公司,重庆400037 [2]辽宁工程技术大学矿业学院,辽宁阜新123000

出　　处：《矿业安全与环保》2016年第3期81-85,共5页Mining Safety & Environmental Protection

基　　金：国家自然科学基金项目(51104085)

摘　　要：为了分析特厚煤层工作面长度与矿压显现的关系,采用理论分析和数值模拟方法,从工作面支架载荷、覆岩破坏高度和采场围岩应力等方面进行了深入研究。根据普氏平衡拱理论,计算得到不同工作面长度支架所需的载荷;采用关键层理论,确定工作面长度大于178 m主关键层将发生破断,工作面开采将受到侏罗系覆岩采动影响;采用FLAC^(3D)数值模拟方法,对不同工作面长度的围岩应力进行了分析。研究表明:工作面长度的变化导致支架载荷、覆岩破坏和围岩应力发生变化,当工作面长度小于178 m时,有利于减弱矿压显现强度,避免强矿压的发生。In order to analyze the relation of the length of the working face in the extra- thick coal seam with the strata behaviors,deep study was carried out on the support load in the working face,the failure height of overburden rock and the stress of the surrounding rock by theoretical analysis and numerical simulation. Based on the Pu's equilibrium arch theory,the support load required for different length of the working face was calculated; with the key strata theory,it was determined that the main key strata would break when the length of the working face was greater than 178 m,and mining would be affected by Jurassic overburden strata; analysis was made on the surrounding rock stress of different face length with FLAC^(3D) numerical simulation method. Studies showed that the change of the face length would lead to the change of the support load,the failure height of overburden rock and the stress of surrounding rock,when the face length was less than 178 m,it was conducive to slow down the strata behavior strength and avoid the occurrence of strong underground pressure.

关 键 词：工作面长度 坚硬覆岩 矿压显现 特厚煤层 

分 类 号：TD32[矿业工程—矿井建设]