沿空留巷双层充填墙体材料力学性能研究及应用  

Mechanical properties of double-layer filling wall for gob-side entry retaining and the engineering application

作　　者：孙垒 曹悦 徐金海[1] 王琪[1,2] 张皓文 张晓悟[1,2] 曾庆林 SUN Lei;CAO Yue;XU Jin-hai;WANG Qi;ZHANG Hao-wen;ZHANG Xiao-wu;ZENG Qing-lin(State Key Labor1tory of Coal Resources and Safe Mining,China University of Mining and Technology,Xuzhou 221116,China;School of Mines,China University of Mining and Technology,Xuzhou 221116,China;Sichuan Sichuan Coal Group Huarong Co.,Ltd.,Chengdu 610000,China)

机构地区：[1]中国矿业大学煤炭资源与安全开采国家重点实验室,江苏徐州221116 [2]中国矿业大学矿业工程学院,江苏徐州221116 [3]四川川煤集团华荣能源有限责任公司,四川成都610000

出　　处：《煤炭工程》2022年第7期56-60,共5页Coal Engineering

基　　金：煤炭资源与安全开采国家重点实验室自主研究课题项目(SKLCRSM2020X05);国家自然科学基金资助项目(51874277)。

摘　　要：为研究沿空留巷双层充填墙体最优占比和对工作面顶板漏风的影响,以漳村煤矿2603工作面沿空留巷为工程背景,通过制备不同占比的混凝土-高水材料立方体组合试样,从不同占比组合试样力学性能及宏观破裂形式研究中选择最优占比,并基于其上部软分层可充分接顶,防止上瓦斯泄漏的特性,对巷道进行瓦斯浓度监测。研究表明,当高水材料占比为10%、20%、30%、40%及50%时,其峰值强度与纯混凝土峰值强度相比分别下降了18.95%、44.23%、52.31%、60.78%及79.68%。高水材料占比为20%以下时,试样在保证一定强度的同时具有让压作用;当高水材料占比为20%以上时,高水材料占比过高会降低混凝土材料的支撑作用,影响试件的整体强度。通过对双层充填墙体在沿空留巷中的应用,可有效降低巷道瓦斯浓度,留巷效果较好。In order to study the optimal proportion of double filling wall along goaf retaining wall and its influence on roof gas leakage of working face,taking the 2603 working face of Zhangcun Coal Mine as the engineering background,by preparing cubic composite samples with different proportions of concrete and high water material,the optimal proportions are selected from the study of mechanical properties and macroscopic fracture forms of the composite samples with different proportions.As the upper soft layer can fully connect the roof and prevent the upper gas leakage,the gas concentration of the roadway is monitored.The results show that when the proportion of high water material is 10%,20%,30%,40%and 50%,the peak strength of the concrete decreases by 18.95%,44.23%,52.31%,60.78%and 79.68%,respectively,compared with the peak strength of pure concrete.When the proportion of high water material is less than 20%,the combined specimen has the effect of pressure yielding while ensuring a certain strength.When the proportion of high water material is more than 20%,the high proportion of soft stratified material will reduce the supporting effect of high strength material at the bottom,thus affecting the overall strength of the specimen.The application results show that the gas concentration can be effectively reduced and the effect of roadway retaining is favorable.

关 键 词：沿空留巷 双层充填墙体 让压接顶层 高强承载层 力学性能 

分 类 号：TD823[矿业工程—煤矿开采]