摘要
传统的煤柱护巷开采模式下易造成应力集中致使巷道变形失稳,并且工作面接替紧张、煤炭资源回收率低。为维护巷道的稳定、解决采掘接替紧张的局面、提高煤矿的效益,在双鸭山矿区东荣二矿南二下-800 m 16煤层第3工作面实施切顶卸压留巷开采技术,对“切顶卸压留巷技术”在复合顶板条件下的工艺流程及关键参数进行设计,并总结工作面和巷道的矿压显现规律。结果表明:工作面周期来压步距为中部<头部<尾部,尾部因切顶卸压有效降低了周边的来压强度;在超前工作面0~45 m围岩进入支承压力明显影响范围,滞后工作面0~50 m为留巷边缘冒落带剧烈活动时期,巷道围岩结构约在滞后工作面150 m进入稳定状态;最大顶板下沉量为260 mm,顶板离层值为110 mm。切顶卸压效果良好,满足安全生产需要。
Under the traditional coal pillar roadway protection mining mode,it is easy to cause stress concentration and roadway deformation instability,and the replacement of working face is tense and the recovery rate of coal resources is low.In order to maintain the stability of the roadway,solve the tense situation of mining replacement and improve the efficiency of the coal mine,the roof cutting and pressure releasing self-forming roadway without coal pillar mining technology was implemented in the south 2nd lower-800 m No.16 coal seam 3rd working face of Dongrong No.2 coal mine in Shuangyashan mining area.The process flow and key parameters of roof cutting and pressure releasing self-forming roadway without coal pillar under the condition of compound roof were designed,and the strata behavior law of working face and roadway was summarized.The results show that step distance of periodic roof pressure intensity of working face is the middle<the head<the tail,and the tail effectively reduces the surrounding pressure strength due to roof cutting and pressure releasing;the surrounding rock of the advance working face 0-45 m enters the obvious influence range of the abutment pressure,and the lag working face 0-50 m is the period of intense activity of the caving zone at the edge of the retained roadway,the surrounding rock structure of the roadway enters the stable state about 150 m in the lag working face;the maximum roof subsidence is 260 mm,and the roof separation value is 110 mm.The pressure releasing is favorable,which meets the needs of safety production.
作者
郝建
陈安法
边华
汤建泉
王社新
张培哲
赵佳丽
HAO Jian;CHEN Anfa;BIAN Hua;TANG Jianquan;WANG Shexin;ZHANG Peizhe;ZHAO Jiali(State Key Laboratory of Mining Disaster Prevention and Control,Shandong University of Science and Technology,Qingdao 266590,China;College of Energy and Mining Engineering,Shandong University of Science and Technology,Qingdao 266590,China;Heilongjiang Longmei Shuangyashan Mining Co.,Ltd.,Shuangyashan 155100,China)
出处
《煤炭技术》
CAS
北大核心
2023年第4期1-4,共4页
Coal Technology
基金
国家自然科学基金项目(51804180,52174121)。
关键词
切顶卸压
复合顶板
矿压显现
关键参数
现场监测
roof cutting and pressure releasing
compound roof
strata behaviors
key parameters
field monitoring
