复杂条件大倾角大采高旋转综采矿压显现规律及其控制  

Investigation into strata behaviours and ground control of high height rotary longwall mining in large inclined angle coal seam under complicated geological conditions

作　　者：杨科[1] 陆伟[1] 潘桂如 孙力[1] 

机构地区：[1]安徽理工大学煤矿安全高效开采省部共建教育部重点实验室,深部煤矿采动响应与灾害防控安徽省重点实验室,安徽淮南232001 [2]淮南矿业(集团)有限责任公司潘北煤矿,安徽淮南232087

出　　处：《采矿与安全工程学报》2015年第2期199-205,共7页Journal of Mining & Safety Engineering

基　　金：国家自然科学基金项目(51374011);国家重点基础研究发展计划(973)项目(2010CB226806);中国博士后基金项目(2012M521211)

摘　　要：针对潘北煤矿复杂条件大倾角"三软"厚煤层赋存特点及大采高旋转综采矿压难以控制的技术难点,采用现场实测、数值模拟等方法研究获得了12124大采高旋转综采工作面及巷道矿压显现规律,揭示了大倾角"三软"厚煤层旋转综采采场和巷道矿压机理,即采空区煤柱下方工作面煤体应力集中、旋采区域采动应力集中与液压支架反复支撑是导致工作面顶板破碎、片帮、冒顶及巷道围岩变形剧烈的主要原因。提出并实施了该条件下旋采过程中采场和巷道围岩稳定性控制技术,主要包括:工作面顶板铺链网并在架头连接工字钢以加强顶板管理;应用液压支架与输送机间连接防滑千斤顶并联合推移千斤顶控制刮板输送机下滑;上风巷旋采拐点处采用锚网索联合支护控制巷道围岩变形;工作面上下端头超前10 m回棚加强支护,保证正常运输通风需求。工程实践表明,该技术实施保证了工作面的安全高效回采,取得了良好的效果。Aimed at complicated geological conditions of large inclined angle seam with soft coal, soft roof, and soft floor and difficulties for ground control in rotary and full-mechanized longwall mining with high height in Panbei coal mine, field observation and numerical simulation have been used to investigation into strata behaviors of No.12124. Based on strata behaviors analyzing, the ground pressure mechanism have been opened out with longwall and high height rotation mining in complicated geological and technical conditions. During the process of rotary mining, with the mining-induced stress affected after No.12125 longwall panel mined, the co-action of abutment pressure concentration devel-oping and powered support periodical supporting is the key factor to result in roof fracturing, roof falling, coal collapsing in working face, and large deformation of entries＇ surrounding rocks. Some technique have been implemented and practiced, which mainly includes as follows：to pave network and use steel beams to strengthen the roof salability; to apply anti-skid jack to connect hydraulic support to conveyor and advancing jack to control the decline of conveyor; to use bolting-wire-mesh to control stability of entries surrounding rock in rotation areas; to reinforce timbers to control stability of entries advanced about 10 m to working face. Engineering practice show that research plays an important role in safely mining and provides technologies for rotation mining in complicated geological conditions.

关 键 词：大倾角厚煤层 旋转综采 矿压显现 围岩稳定性 采动应力 

分 类 号：TD323[矿业工程—矿井建设]