摘要
针对巨野矿区深厚表土-薄基岩地层条件下沿空巷道围岩大变形与冲击失稳难题,本文以郭屯煤矿2303工作面为工程背景,通过理论分析、数值模拟与现场试验相结合的方法开展研究,揭示了深厚表土-薄基岩覆岩结构演化机制。研究表明基岩层因强度低、厚度小,无法形成有效承载结构,导致覆岩由传统“三带”退化为即时加载带(ILZ)与静载带(SLZ)的两带结构。表土层呈倒梯形整体运移,诱发持续高静载应力,致使巷道围岩呈现顶板下沉、两帮非对称收敛、浅部破碎区扩展及深部能量积聚的渐进劣化现象。基于此,提出变径卸压协同优化支护技术,采用浅部小孔径+深部大孔径的钻孔设计,使用高分子材料回填浅部孔段,实现浅部保完整、深部释能量。应用结果表明,该技术有效控制了围岩变形,为类似地质条件下深部沿空巷道围岩控制提供理论依据与技术参考。
Aiming at the problem of large deformation and impact instability of surrounding rock in gob-side entry under the condition of deep topsoil-thin bedrock strata in Juye mining area,No.2303 Face of Guotun Coal Mine was taken as the engineering background,and revealed the evolution mechanism of overburden structure of deep topsoil-thin bedrock through theoretical analysis,numerical simulation and field test.The research showed that the bedrock layer cannot formed an effective bearing structure due to its low strength and small thickness,which led to the degradation of the overburden from the traditional'three zones'to the two-zone structure of the immediate loading zone(ILZ)and the static loading zone(SLZ).The surface soil layer migrated in an inverted trapezoidal shape,which induced continuous high static load stress,resulting in the gradual deterioration of the surrounding rock of the roadway,such as roof subsidence,asymmetric convergence of two sides,expansion of shallow fracture zone and deep energy accumulation.Based on this,the collaborative optimization support technology of variable diameter pressure relief was proposed:the drilling design of shallow small aperture+deep large aperture was adopted,and the shallow hole section was backfilled with polymer materials to realize the shallow integrity and deep energy release.The application results showed that the technology could effectively control the deformation of surrounding rock,and provided theoretical basis and technical reference for the surrounding rock control of deep gob-side roadway under similar geological conditions.
作者
孙轲
郑灿广
邢浩树
潘德远
张令卓
Sun Ke;Zheng Canguang;Xing Haoshu;Pan Deyuan;Zhang Lingzhuo(Ordos Yingpanhao Coal Co.,Ltd.,Ordos 017399,China;Yankuang Energy Group Co.,Ltd.,Jining 272000,China;College of Energy and Mining Engineering,Shandong University of Science and Technology,Qingdao 266590,China;Jining No.2 Coal Mine,Yankuang Energy Group Co.,Ltd.,Jining 272072,China)
出处
《煤炭与化工》
2026年第1期16-24,31,共10页
Coal and Chemical Industry
关键词
深厚表土
薄基岩
两带结构
变径卸压
deep-thick overburden soil
thin bedrock strata
two-zone structure
variable-diameter pressure relief
