煤矿巷道围岩注浆堵水新型水泥浆液性能研究  

Research on performance of new type cement slurry for water shutoff in coal mine roadway

作　　者：刘慧妮 李训刚 李彦志 张帅 陈朋成 吴岳 樊震旺 唐超 LIU Huini;LI Xungang;LI Yanzhi;ZHANG Shuai;CHEN Pengcheng;WU Yue;FAN Zhenwang;TANG Chao(Key Laboratory of Disaster Prevention and Reduction in Civil Engineering in Shcuulong Province,Qingdao266590,China;School of Civil Engineering and Architecture,Shandong University of Science and Technology,Qingdao 266590,China)

机构地区：[1]山东省土木工程防震减灾重点实验室,山东青岛266590 [2]山东科技大学土木工程与建筑学院,山东青岛266590

出　　处：《煤矿安全》2021年第10期57-63,共7页Safety in Coal Mines

基　　金：国家自然科学基金资助项目(51774192)。

摘　　要：针对深部煤矿巷道涌水问题严重影响煤矿施工安全,而普通水泥浆液对于微小岩石裂隙又难以封堵的难题,以微米级粉煤灰代替部分超细水泥,加以常用的聚羧酸减水剂,并使用外掺剂纳米CaCO_(3)改善复合浆液性能。试验结果表明:浆液性能变化随水灰比变化而变化,其与初始黏度、结石率和强度成负相关,与流动度呈正相关;而纳米CaCO_(3)的适当添加使得强度略有提升,但黏度、流动度及结石率没有明显变化;微米级粉煤灰的掺加降低了黏度、结石率及强度,并适当提高了流动度;聚羧酸减水剂与流动度呈正相关,与结石率呈负相关,但对黏度和强度影响较小;浆液黏度随时间的变化可分为稳定期和上升期2个阶段,稳定期黏度变化率不超过15.5%。In view of the problem that the water gushing problem of deep coal mine roadway seriously affects the safety of coal mine construction, and the common cement grout is difficult to seal up the tiny rock cracks, the micron-grade fly ash is used to replace part of superfine cement, polycarboxylate superplasticizer and nano-CaCO_(3) admixture are used to improve the performance of composite slurry. The results show that the slurry properties vary with the water-cement ratio, and are negatively correlated with the initial viscosity, hardened rate and strength, while positively correlated with fluidity. The appropriate addition of nano-CaCO_(3) made the strength slightly improved, but the viscosity, fluidity and hardened rate did not change significantly. The addition of micron-grade fly ash reduces the viscosity, hardened rate and strength, and appropriately improves the fluidity. The polycarboxylate superplasticizer was positively correlated with fluidity and negatively correlated with stone rate, but had little effect on viscosity and strength. The change of slurry viscosity with time can be divided into two stages: stable period and rising period.The viscosity change rate of stable period does not exceed 15.5%.

关 键 词：煤矿巷道 围岩稳定性 注浆堵水 流动特性 结石特性 

分 类 号：TD745.26[矿业工程—矿井通风与安全]