中厚煤层复合顶板切顶卸压自动成巷工作面矿压显现特征分析  

Feature analysis of working face strata pressure with roof cutting pressure releasing in medium-thick seam and compound roof condition

作　　者：何满潮[1] 马新根 王炯[1,2] 张家宾 刘雨兴 HE Manchao;MA Xingen;WANG Jiong;ZHANG Jiabin;LIU Yuxing(State Key Laboratory for Geomechanics and Deep Underground Engineering,China University of Mining and Technology（Beijing）,Beijing 100083,China;School of Mechanics and Civil Engineering,China University of Mining and Technology（Beifing）,Beijing 100083,China)

机构地区：[1]中国矿业大学(北京)深部岩土力学与地下工程国家重点实验室,北京100083 [2]中国矿业大学(北京)力学与建筑工程学院,北京100083

出　　处：《岩石力学与工程学报》2018年第11期2425-2434,共10页Chinese Journal of Rock Mechanics and Engineering

基　　金：国家重点基础研究发展计划资助项目(2016YFC0600900);国家自然科学基金青年基金项目(51404278)~~

摘　　要：为探究切顶卸压自动成巷技术条件下的工作面矿压显现特征及机制,以塔山煤矿8304工作面为例,在对切顶成巷技术原理及工艺流程进行总结的基础上,提出具体成巷设计,随后通过现场监测、数值模拟以及理论推导等手段,对工作面的矿压分布特征及演化过程进行分析。监测结果显示:(1)工作面中部来压步距最短、来压强度最高,且受留巷切顶影响,工作面来压步距及强度分布呈现非对称性;(2)留巷侧顶板的周期来压步距较之未切缝侧较大,平均增幅为4 m,但来压压强降低,平均来压压强降低2.1 MPa,降幅9.2%,峰值来压强度降低10.2 MPa,降幅25.0%,切顶卸压效果明显,且峰值压力受切顶卸压影响更大;(3)顺槽切顶于工作面的横向影响范围大致为29.75m,越靠近切缝处影响效果越显著。数值模拟进一步发现:顺槽预裂切顶对工作面来压在走向方向上的超前影响范围约为20 m,超前影响范围内,影响程度随超前距离增加逐渐减小;在滞后工作面30 m范围内,滞后工作面距离越远,顺槽切顶卸压影响越大;在滞后工作面30 m之后,顺槽切顶影响幅度基本维持不变。The working face 8304 of Tashan coal mine was studied to explore the characteristics and mechanism of the mining pressure around working faces under the roof cutting pressure releasing gob-side entry retaining condition. The monitoring results indicate that the middle area of the working face has the shortest pressure step distance and the highest compressive strength. Affected by the pre-cracking roof cutting,the pressure step and the intensity distribution of the working face are asymmetrical. The pressure step distance of the roof cutting side is larger than that of the uncut side with the increment of 4 m,but the pressure is reduced. The average pressure is reduced by 2.1 MPa（9.2%） and the peak pressure is reduced by 10.2 MPa（25.0%）. The effect of roof cutting pressure releasing is obvious and the peak pressure is more affected by roof cutting. The transverse range of influencing of roof cutting along the working face is approximately 29.75 m. The closer to the slit is,the more significant the effect is. The results of numerical simulation reveal that the advance influence range of pre-crack roof cutting on the working face in the direction of strike is about 20 m. Within the range of advance influence,the influence degree decreases gradually with the advance distance. Within lagging working face 30 m,the further the distance from the working face is,the greater the influence of the roof cutting is. After lagging working face 30 m,the impact amplitude of roof cutting remains basically stable.

关 键 词：采矿工程 切顶卸压 自动成巷 矿压显现 工作面 监测分析 数值模拟 

分 类 号：TD32[矿业工程—矿井建设]