煤层底板灰岩区域注浆浆液屈服强度性能实验  

An experimental study on the yield strength of cement grout for grouting in the limestone area of a coal seam floor

作　　者：邹军[1] 郭艳[2] 桂和荣[2] 汪伟民 陈振林[4] 刘发明[2] 戴亚男 胡洋 陈增宝 李俊 高川 李恒 ZOU Jun;GUO Yan;GUI Herong;WANG Weimin;CHEN Zhenlin;LIU Faming;DAI Yanan;HU Yang;CHEN Zengbao;LI Jun;GAO Chuan;LI Heng(Anhui Hengyuan Coal&Electric Co.,Ltd.,Suzhou 234000,China;National Engineering Research Center of Coal Mine Water Hazard Controlling(Suzhou University),Suzhou 234000,China;Tiandi Science&Technology Co.,Ltd.,Beijing 100013,China;Suntuan Coal Mine of Huaibei Mining Group Co.,Ltd.,Huaibei 235000,China)

机构地区：[1]安徽恒源煤电股份有限公司,安徽宿州234000 [2]国家煤矿水害防治工程技术研究中心(宿州学院),安徽宿州234000 [3]天地科技股份有限公司,北京100013 [4]淮北矿业集团公司孙疃煤矿,安徽淮北235000

出　　处：《煤田地质与勘探》2025年第4期182-190,共9页Coal Geology & Exploration

基　　金：国家自然科学基金青年项目(42402250);陕西省煤矿水害防治技术重点实验室开放基金项目(2021SKQN01);安徽省高校优秀科研创新团队项目(2022AH010081);安徽省公益性地质项目(2023-g-1-11);博士(后)科研启动基金项目(2022BSK037,2023BSH003);省级校企实践合作教育基地项目(2023xqhz066、szxy2022sxzx01)。

摘　　要：【目的和方法】近年来,地面定向钻区域注浆是煤矿区底板灰岩水害的首选技术。在其注浆工程实施中,浆液扩散半径一直备受关注,而浆液扩散半径受浆液剪切屈服强度(简称“屈服强度”)、浆液相对密度、注浆压力等多种因素制约,影响现场注浆工程实施效果,其中屈服强度无法现场测试。以淮北煤田恒源煤矿实际注浆工况为例,通过配制不同水灰比浆液,开展浆液剪切实验,分析初始黏度、凝结时间等因素影响,获得屈服强度参数,探讨屈服强度对浆液扩散半径、注浆压力等因素的影响。【结果和结论】结果显示:(1)恒源煤矿P.O42.5级水泥制成的相对密度1.2~1.6的水泥浆,随着初凝时间的增加,浆液的初始黏度总体上随浆液相对密度的增大而增大,浆液相对密度越大,黏度增长越快。(2)区域注浆水泥在初凝之前的剪切应力在0~17 Pa,屈服强度在0~13 Pa;浆液相对密度1.2、1.3的浆液易于流淌,适用于底板太原组第三层灰岩窄而深的细微裂缝的灌注。(3)相同注浆条件下,随浆液屈服强度增加浆液扩散范围减小,当屈服强度为0.5 Pa时,浆液扩散范围大于35 m;当屈服强度大于1.5 Pa时,浆液扩散范围开始小于10 m。(4)示踪试验验证,实际浆液扩散较远处水泥主要来自屈服强度较低的相对密度为1.2的浆液,与室内实验结果相一致。该研究对注浆治理工程实施具有一定的参考作用。[Objective and Methods] In recent years,regional grouting through ground directional drilling has become the preferred technique for water disaster prevention and control in floor limestones in a coal mining area.In grouting engineering,the diffusion radius of cement grout,which has always received wide attention,is constrained by multiple factors including the shear yield strength(yield strength for short) and specific gravity of cement grout,along with grouting pressure.The diffusion radius in turn influences the implementation effects of on-site grouting engineering.Among its controlling factors,the yield strength of cement grout cannot be tested on site.Given this,this study investigated actual grouting conditions in the Hengyuan Coal Mine of the Huaibei coalfield.Using shear experiments on the prepared cement grout with varying specific gravities,this study analyzed the impacts of factors such as initial viscosity and setting time and determined the yield strength of the cement grout.Furthermore,it explored the impacts of the yield strength on factors like the diffusion radius of cement grout and grouting pressure.[Results and Conclusions] The results indicate that as the initial setting time increased,the initial viscosity of cement grout with specific gravities ranging from 1.2 to1.6,prepared using cement P.O42.5 in the Hengyuan Coal Mine,increased with the specific gravity generally.Furthermore,a higher specific gravity corresponded to more rapid growth in the viscosity.The cement for regional grouting exhibited shear stresses ranging between 0 Pa to 17 Pa and yield strength from 0 Pa to 13 Pa before the initial setting.The cement grout with specific gravities of 1.2 and 1.3 was more prone to flow,thus suitable for grouting in narrow,deep microfractures in the third dolomite layer of the Taiyuan Formation.Under identical grouting conditions,the diffusion range of the cement grout decreased with an increase in its yield strength.Specifically,the diffusion range exceeded35 m under a yield strength of 0.5 Pa

关 键 词：底板区域治理 浆液流型 浆液剪切实验 浆液屈服强度 淮北煤田恒源煤矿 

分 类 号：P641[天文地球—地质矿产勘探] TD741[天文地球—地质学]