综放大跨度三心微拱形开切眼围岩破坏机理与控制技术Failure mechanism and control technology of surrounding rock of three-centered-micro-arched large span open-off cut in fully-mechanized caving mining face
王红胜;赵杨阳;李磊;郭卫彬;朱广安;肖双双;
摘要(Abstract):
针对松软厚煤层综放大跨度开切眼围岩控制难题,以魏家地煤矿2303工作面开切眼为工程背景,采用数值模拟与现场实践相结合的方法,提出了三心微拱形开切眼断面形状,探讨了三心微拱形开切眼围岩应力分布特征及破坏机理,并与矩形切眼对比分析。结果表明:三心微拱形开切眼的肩角和顶板受力均匀,能够将顶板垂直应力传递到两帮,肩部所受压应力明显减小,未出现较大应力集中现象;肩角附近围岩主要受到压剪破坏,破坏区域集中,呈"蝶形"分布;顶板围岩受到拉剪破坏,破坏区域面积减小,围岩相对稳定;且弧形顶板、肩角有利于锚杆安装。基于三心微拱形开切眼围岩破坏特征,提出了锚杆-锚索-锚网联合支护的围岩控制技术,顶板下沉量减少50%,两帮移近量减少55%;在2303工作面进行工业性试验,现场实测顶板下沉量为170 mm,两帮相对移近量为220 mm,围岩控制效果良好。
关键词(KeyWords): 三心微拱形;综放开采;大跨度开切眼;软厚煤层;破坏机理
基金项目(Foundation): 国家自然科学基金(51974231,51904235);; 国家重点基础研究计划(973计划)(2015CB251600);; 中国博士后科学基金(2018M643692);; 陕西省自然科学基础研究计划(2019JQ-487)
作者(Author): 王红胜;赵杨阳;李磊;郭卫彬;朱广安;肖双双;
Email:
DOI: 10.13800/j.cnki.xakjdxxb.2020.0107
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