摘要
为了实现开滦矿区深埋且上覆采空区条件下拱形煤巷快速掘进,针对东欢坨煤矿9煤采用理论分析、数值模拟、设备改造及施工工艺优化的方法,对拱形巷道最大空顶距、空顶区围岩稳定性、快速掘进配套设备及工艺展开研究。研究成果:基于薄壳理论,建立拱形巷道顶盖柱壳力学模型,采用无矩理论假设及最大拉应力破坏准则,推导得出拱形顶板最大空顶距计算公式,分析得到巷道宽度、抗拉强度、埋深及拱高对最大空顶距的影响规律及权重,并确定理论最大空顶距为2.4 m。数值模拟发现,空顶距2 m左右时巷道无拉伸破坏,空顶距大于4 m后巷道两帮产生拉伸破坏,因此数值计算的最大空顶距在2~3 m之间;适当增大空顶距有利于U型钢快速达到支护强度。改进自制机载站人平台与机载托梁器联合装置及新型长掘长支机载式临时支护装置,解决了2.4 m空顶区架棚及临时支护效率低、安全性差的难题,配合优化后的工艺流程进行现场应用,平均月进550 m以上,从而实现快速掘进。
In order to rapidly excavate arched coal roadway under goaf of deep mines in Kailuan mining area,theoretical analysis,numerical simulation,equipment transformation and construction technology optimization are adopted for No.9 coal seam of Donghuantuo Coal Mine.The maximum interval of unsupported roof of arched roadway,the stability of surrounding rock in unsupported roof area,and the supporting equipment and technology of rapid excavation are studied.Based on the thin shell theory,the mechanical model of the cylindrical shell of the arched roadway roof is established,and the calculation formula of the maximum interval of unsupported roof is derived.The influence law and weight of different factors on the maximum interval of unsupported roof are analyzed.The theoretical interval is 2.4 m,and the numerical simulation result is between 2-3 m.Appropriately increasing the interval is beneficial to the U-shaped steel to quickly reach the support resistance.By improving the combined device of self-made mounted station operation platform and mounted beam carrier and the new type of long excavation and long support airborne temporary support device,the problems of low efficiency and poor safety of shed and temporary support in 2.4 m unsupported roof area are solved.The average monthly footage is more than 550 m,realizing rapid excavation.
作者
李小沫
武超
王兆瑞
王凤
LI Xiaomo;WU Chao;WANG Zhaorui;WANG Feng(Inner Mongolia Kailuan Investment Co.,Ltd.,Ordos 010300,China;School of Energy and Mining Engineering,China University of Mining and Technology-Beijing,Beijing 100083,China;The Beijing Prevention and Treatment Hospital of Occupational Disease for Chemical Industry,Beijing 100093,China)
出处
《煤炭工程》
北大核心
2023年第10期40-48,共9页
Coal Engineering
关键词
拱形巷道
最大空顶距
围岩稳定性
快速掘进
设备改造
arched roadway
maximum interval of unsupported roof
surrounding rock stability
rapid tunneling
equipment transformation
作者简介
李小沫(1971-),男,河北昌黎人,高级工程师,现主要从事煤炭技术管理工作,E-mail:15147769167@163.com。
