含软泥夹层灰岩顶板巷道“锚-架-喷”协同控制技术  

“Anchoring-shed-shotcreting” collaborative control technology for limestone roof roadway with soft clay interlayer

作　　者：王俊红 焦建康 WANG Junhong;JIAO Jiankang(Chengzhuang Coal Mine,Jincheng Blue Flame Indiustry Co.,Ltd.,Jinrheng 048000,China;China Cool Technology arid Engineering Croup Coal Mining Research Institutey Beijing 100013,China;Coal Mining and Design Department,Turndi Science&Technology,Co.,Ltd.,Beijing 100013,China)

机构地区：[1]晋城蓝焰煤业股份有限公司成庄矿,山西晋城048000 [2]中煤科工开采研究院有限公司,北京100013 [3]天地科技股份有限公司开采设计事业部,北京100013

出　　处：《煤矿安全》2021年第9期129-135,141,共8页Safety in Coal Mines

基　　金：中煤科工开采研究院有限公司科技创新基金资助项目(2020KCMS03);国家自然科学基金资助项目(51804159)。

摘　　要：针对含软泥夹层灰岩顶板巷道围岩原位强度低、完整性差的特点,探讨了其变形破坏的内在原因,提出了"双层承载拱"加固机理及"锚-架-喷"协同控制技术;将矩形断面巷道优化为拱形断面,通过提高锚杆(索)的强度和刚度、施加高预紧力,在围岩体内部形成"深部承载拱"结构;同时在巷道中架设U型钢可缩性支架,使其在巷道表面形成"浅部承载拱"结构;最后采用混凝土喷层封闭巷道表面,防止围岩风化和遇水软化,充分发挥"双层承载拱"结构的承载能力,以实现巷道的长期稳定。现场实践表明:采用以"锚-架-喷"为基础的协同控制技术,巷道围岩变形量降低90%以上,显著提高了含软泥夹层灰岩顶板巷道的稳定性。In view of the characteristics of low in-situ strength and poor integrity of surrounding rock of limestone roof roadway with soft clay interlayer, the internal causes of deformation and failure are discussed, and the reinforcement mechanism of"double-layer bearing arch"and the "anchor support spray"cooperative control technology are proposed. The rectangular section roadway is optimized to arch section, through improving the strength and stiffness of bolt(cable) and applying high preload, the"deep bearing arch"structure is formed in the surrounding rock body;at the same time, the U-shaped steel retractable support is erected in the roadway to form the"shallow bearing arch"structure on the roadway surface;finally, the concrete shotcrete layer is used to close the roadway surface to prevent the weathering of surrounding rock and the softening of water, so as to give full play to the bearing capacity of the "double-layer bearing arch"structure, so as to realize the long-term stability of the roadway. The field practice shows that the surrounding rock deformation of the roadway can be reduced by more than 90% by adopting the cooperative control technology based on"anchor support shotcreting", and the stability of the roadway with limestone roof with soft clay interlayer can be significantly improved.

关 键 词：含软泥夹层灰岩 锚网支护 U型钢支架 混凝土喷层 巷道断面优化 

分 类 号：TD353[矿业工程—矿井建设]