地面注浆加固顶板高掺量粉煤灰水泥浆液材料性能研究  

Study on Performance of Cement Slurry Material with High Fly Ash Content for Roof Reinforcement by Grouting on the Ground

作　　者：张曼曼 鲁海峰[1] 年宾 姚多喜[1] 张桂芳 ZHANG Manman;LU Haifeng;NIAN Bin;YAO Duoxi;ZHANG Guifang(College of Earth and Environment,Anhui University of Technology,Huainan 232001,China;Chexplore Resource Exploration Technology Co.,Ltd.,Huaibei 235000,China)

机构地区：[1]安徽理工大学地球与环境学院,安徽淮南232001 [2]中勘资源勘探科技股份有限公司,安徽淮北235000

出　　处：《煤矿安全》2020年第6期60-65,共6页Safety in Coal Mines

基　　金：国家自然科学基金资助项目(51474008)。

摘　　要：针对垮落带直覆下采煤破碎顶板低强度加固特点,基于粉煤灰对水泥浆液性能影响,采用室内静置试验方法,分别对不同水泥粉煤灰比例的浆液进行了优化试验并得出最优强度和流动性配比。试验结果表明,水泥浆液的抗压强度和流动度随固相比的减小(粉煤灰掺量增大)而降低,但凝结时间随之延长及结石率随之增大;硬化体早期强度较低,后期强度有明显增长。当固相比为2∶8时,水泥和粉煤灰的物理化学反应良好,流动性能整体上较好,结石体强度在1MPa以上,凝结时间也较长。研究成果在许疃矿7228工作面垮落带直覆下采煤地面注浆加固工程中取得了良好的应用效果。According to the characteristics of the low strength reinforcement of the coal mining broken roof under the direct cover of the caving zone,based on the influence of fly ash on the performance of the cement slurry,the indoor static test method was used to optimize the slurry with different cement fly ash ratios,and the optimal strength and liquidity ratio were obtained.The results showed that the compressive strength and fluidity of the slurry decreased with the decrease of solid ratio(the increase of fly ash content),while the setting time and the rate of stone increase with it.The early strength of the hardened body was low,and the later strength increased greatly.When the solid ratio was 2∶8,the physical and chemical reaction between cement and fly ash was good.The fluidity performance was good as a whole.The strength of stone body was above 1 MPa and the setting time was longer.The research results had achieved good application effect in the ground grouting reinforcement project under the direct cover of the caving zone in 7228 working face of Xutuan Mine.

关 键 词：高掺量粉煤灰 水灰质量比 固相比 垮落带 地面注浆 顶板加固 

分 类 号：TD353[矿业工程—矿井建设]