成庄矿4311综放工作面沿空留巷技术
Gob-side Entry Retaining Technology of 4311 Fully-mechanized Caving Face in Chengzhuang Coal Mine
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摘要: 为研究综放工作面沿空留巷充填工艺及留巷变形规律，通过理论计算确定了充填体参数，研发双液充填材料实现了远距离输送工艺，并进行了留巷变形观测。结果表明：充填体宽度2 m、材料水灰比1.5∶1，满足工程需求；该材料单液性能稳定，有利于远距离输送，充填体增阻快速，3 d达到设计强度；留巷以底鼓和充填体变形为主，均占60%以上，工作面后方0～80 m为留巷变形剧烈区，顶板和煤帮在210 m以后变形速度小于0.5 mm/d，底板由于缺少支护长期蠕变。Abstract: To research the filling process and deformation law of gob-side entry retaining in Chengzhuang Coal Mine 4311 fully-mechanized caving face, we determined the parameters of filling body through theoretical calculation, researched double liquid filling material to realize long distance transporting technology, and observed the deformation in the retained entry. Results show that 2 meters width of filling body and 1.5∶1 of water-cement ratio can satisfy engineering constraint; single liquid of the filling material has stable performance, is beneficial to realize the long-distance transporting technology; it has rapid growth of resistance performance, can reach to designed strength in three days; floor heaving and filling body deformation are major of entry deformation, both of them take more than 60%, the range from 0 m to 8 m behind face is the drastically changing area, and 210 m behind the face, roof and coal's deformation speed is less than 0.5 mm/d , but floor is in long-term creep because of a lack of support.
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