浅埋近距离房柱采空区下顶板活动规律与支架支护强度计算  

Roof Movement Law and Support Supporting Strength Calculation in Shallow Depth Close Distance Room Mining Gob

作　　者：郭卫彬[1,2] 刘长友[1,2] 康庆涛[3] 赵占全[1,2] 杜英山 常龙 

机构地区：[1]中国矿业大学煤炭资源与安全开采国家重点实验室,江苏徐州221116 [2]中国矿业大学矿业工程学院,江苏徐州221116 [3]华北科技学院安全工程学院,河北三河065201 [4]河内地矿大学,越南河内100803 [5]山东鲁能菏泽煤电开发有限公司,山东郓城274700

出　　处：《煤矿安全》2014年第10期35-38,共4页Safety in Coal Mines

基　　金：中国矿业大学煤炭资源与安全开采国家重点实验室自主研究课题资助项目(SKLCRSM12X03);国家自然科学基金资助项目(51174192);江苏省研究生创新工程资助项目(CXZZ11-0310);江苏省"333工程"培养基金资助项目(BRA2010024);江苏省高校优势学科建设工程资助项目(SZBF2011-6-B35)

摘　　要：为了保障浅埋近距离房柱采空区下方综采工作面的安全高效开采,以大地精煤矿为工程背景,采用数值模拟和理论分析的方法分析了房柱采空区下综采工作面的顶板活动规律以及支架的合理支护强度。结果表明：2#煤层采留煤柱的应力影响深度约为20 m,对于3#煤层老顶活动规律和支架的支护强度产生影响;在房柱采空区下,综采工作面的破断失稳方式呈现滑落失稳和回转失稳的周期性变化趋势,同时分析得到了残留煤柱产生的应力集中系数约为1.30。理论计算结果表明,在该类条件下一般浅埋工作面的合理支护强度为0.82~0.93 MPa,考虑残留煤柱的应力集中可以得到房柱采空区下综采工作面的合理支护强度为1.07~1.21 MPa。In order to realize the safe and high efficient production in a shallow depth close distance room mining goaf, theoretical anal- ysis and numerical simulation were used to get the roof movement law and the rational support strength based on geological conditions in Dadijing Coal Mine. The results show that the depth of stress concentration is about 20 m which implies that main roof movement of 3^# coal seam can be affected by the left coal pillars in 2^# coal seam. The main roof tends to instability because of slide and rotary which appears by turns and the vertical stress concentration factor in the support control area is 1.30 under coal pillar. The theoretical analysis show that the rational support strength is 0.82 to 0.93 MPa in the common shallow depth seam and under the room mining goal the rational support strength will be 1.07 to 1.21 MPa considering the impact of stress concentration.

关 键 词：浅埋煤层 房柱采空区 近距离 顶板活动规律 支护强度 

分 类 号：TD353[矿业工程—矿井建设]