摘要
目的为解决薄煤层开采沿空留巷围岩稳定性问题,开展薄煤层深浅孔协同爆破切顶卸压沿空留巷技术研究。方法以孟津煤矿11031工作面薄煤层开采沿空留巷为工程背景,通过理论分析阐述了薄煤层沿空留巷顶板垮落特征,提出了深浅孔协同爆破切顶卸压技术。利用数值模拟方法分析了浅孔预裂成缝、深浅孔协同爆破切缝、深孔预裂成缝3种切顶方式下巷道的应力和位移分布特征,确定了深浅孔协同爆破切缝的合理性;同时,优化设计二2煤层工作面沿空留巷顶板超前与滞后支护参数,并在孟津煤矿11031工作面胶带运输巷进行工业性试验。结果模拟结果显示,深浅孔协同爆破切顶卸压技术可以使采空区顶板上覆岩层充分垮落,有效阻断覆岩之间的应力传递,改善巷道顶板应力环境;工程应用监测结果表明,深浅孔协同爆破切顶卸压配合超前与滞后支护可以有效减少留巷过程中巷道围岩变形量,保证留设巷道的稳定性。结论深浅孔协同爆破切顶卸压技术可以较为有效解决薄煤层开采沿空留巷围岩稳定性的问题。
Objectives To address the issue of surrounding rock instability in gob-side entry retaining during thin coal seam mining,a roof cutting and pressure relief technique using coordinated deep and shallow hole blasting was developed.Methods Taking the 11031 working face of Mengjin Coal Mine as the engineering background,the roof caving characteristics of gob-side entry retaining in thin coal seams were analyzed through theoretical research.A blasting technique combining deep and shallow holes was proposed.Numerical simulations were conducted to compare the stress and displacement distributions under three roofcutting schemes:shallow-hole pre-splitting,deep-hole pre-splitting,and coordinated deep and shallow hole blasting.The effectiveness of the coordinated blasting method was validated.Meanwhile,the parameters of advanced and lagging support systems for the No.2 coal seam were optimized,and an industrial test was carried out in the belt roadway of the 11031 working face.Results The simulation results indicated that the proposed method could promote complete caving of the overlying strata in the goaf,effectively block stress transmission between strata,and improve the stress environment of the roadway roof.Field monitoring confirmed that coordinated deep and shallow hole blasting,combined with optimized support design,significantly reduced roadway deformation and ensured the stability of gob-side entry retaining.Conclusions The proposed technique effectively solves the problem of surrounding rock instability in gob-side entry retaining during thin coal seam mining.
作者
支光辉
刘江
Zhi Guanghui;Liu Jiang(School of Energy Science and Engineering,Henan Polytechnic University,Jiaozuo 454000,Henan,China;Collaborative Innovation Center of Coal Work Safety and Clean High Efficiency Utilization,Jiaozuo 454000,Henan,China)
出处
《河南理工大学学报(自然科学版)》
北大核心
2025年第6期92-100,共9页
Journal of Henan Polytechnic University(Natural Science)
基金
国家自然科学基金资助项目(52074102)
河南省高校科技创新团队项目(23IRTSTHN007)。
关键词
薄煤层
沿空留巷
深浅孔
协同爆破
切顶卸压
thin coal seam
gob-side entry retaining
deep and shallow hole
coordinated blasting
roof cutting and pressure relief
