矿业科学学报2025，Vol.10Issue(6)：1078-1089,12.DOI:10.19606/j.cnki.jmst.2025150
煤巷掘进空顶区顶板力学响应机制及临时支护技术研究
Mechanical response mechanism and temporary support for unsupported roof area in coal roadway excavation
摘要
Abstract
This study investigates the mechanical response mechanism and temporary support method of surrounding rock in coal mines under varying unsupported roof distances,with 9103 transportation road-way of Wangzhuang coal mine taken as a case study.We established a mechanical model of shallow surrounding rock in the unsupported roof area of coal mines by drawing on the thin slabs and universal falling arch theories,where an expression of the maximum unsupported roof distance was derived.Nu-merical simulation was conducted using FLAC 3D software to simulate the spatiotemporal evolution of deformation,stress,and plastic zone of surrounding rock in roadway with varying top spacing.Results show that:identified roadway width,the tensile strength of the roof,the load on the roof,and the thickness of the shallow separated rock mass as main controlling factors affecting the empty roof dis-tance.As the unsupported roof distance increases from 0.5 m to 1.0 m,1.5 m,and 2.0 m,the incre-ments in roof subsidence are 4.82 mm,3.67 mm,and 8.31 mm,respectively,showing an initial steady subsidence followed by an accelerated trend.The minimum vertical stress at the center of the cross-section along the excavation direction decreases from 7.85 MPa to 1.24 MPa.When the unsup-ported roof distance increases to 2.5 m and 3.0 m,internal damage in the surrounding rock intensifies,leading to surface deformation instability.The critical value for a reasonable unsupported roof distance is determined to be 2.0 m.To address the limitations of the temporary support device of the coal road-way,we proposed a new type of machine-mounted temporary support device,and its sufficient support-ing capacity is verified using Ansys software.The 9103 transportation roadway adopts this support de-vice,the excavation speed is increased by 33.3%by increasing the cyclic feed of the roadheader and through the parallel operation of knocking on the top and temporary support.关键词
煤巷/极限空顶距/力学响应/临时支护/掘进效率Key words
coal roadway/ultimate empty top distance/mechanical response/temporary support/ex-cavation efficiency分类
矿业与冶金引用本文复制引用
郝文华,王方田,吴培林,尹志华,汤天阔,刘超,吴渝..煤巷掘进空顶区顶板力学响应机制及临时支护技术研究[J].矿业科学学报,2025,10(6):1078-1089,12.基金项目
国家自然科学基金(52474151) （52474151）
江苏省基础研究计划(BK20250107) （BK20250107）
江苏高校"青蓝工程" （）
江苏省研究生科研与实践创新计划(KYCX25_2794) （KYCX25_2794）
中国矿业大学研究生创新计划,中央高校基本科研业务费专项资金(2025WLKXJ021) （2025WLKXJ021）
