深井软岩无机有机复合注浆加固材料研发与应用  

Research and application of inorganic and organic composite grouting reinforcement materials in deep weak rock

作　　者：管学茂[1,2] 李雪峰 张海波 杨政鹏[1,2] 李海艳 狄红丰[1] 张莉 GUAN Xuemao;LI Xuefeng;ZHANG Haibo;YANG Zhengpeng;LI Haiyan;DI Hongfeng;ZHANG li(School of Materials Science and Engineering,Henan Polytechnic University,Jiaozuo 454003,China;Henan Key Laboratory of Materials on Deep-Earth Engineering,Jiaozuo 454003,China)

机构地区：[1]河南理工大学材料科学与工程学院,河南焦作454003 [2]河南省深地材料科学与技术重点实验室,河南焦作454003

出　　处：《煤炭科学技术》2023年第8期1-11,共11页Coal Science and Technology

基　　金：国家自然科学基金资助项目(U1905216);国家重点研发计划资助项目(2017YFC0603004)。

摘　　要：千米深井软岩大巷围岩大变形、裂隙闭合和渗透性差等问题突出,要求注浆材料可注性好、凝结速度快、早期强度高,黏结性能强。为此,设计采用“组分优化+超细化+纳米增强+有机改性”协同制备无机注浆材料新方法,研发出硫铝酸钙、石膏、石灰三元胶凝体系最佳质量比为50∶40∶10的无机注浆材料。超细化后结石体4 h抗压强度提高163.0%,初步实现早强快凝;开发了具有纳米晶核诱导结晶和锂离子促溶协同作用的纳米锂铝类水滑石增强材料,使超细注浆材料2 h强度提高183.7%;合成了煤岩界面具有定向耦合效应的有机调节剂,通过与浆液和煤界面的键合作用形成桥梁,显著提高了浆液结石体与煤岩界面黏结。协同制备的无机有机复合注浆加固材料粒径小(D95<10μm),凝结快(<8 min),早期强度高(2 h强度11.5 MPa),黏结性能强(砂岩黏结强度3.12 MPa)。研究开发出了具有“高早强、高可注、高黏结”性能的深井软岩无机有机复合注浆加固材料。现场应用试验采用高压注浆方式,浆液可注入煤样大裂隙和微裂隙,连通孤立裂隙实现高压劈裂,松散煤体得到压实。煤壁表面裂隙漏浆和锚杆孔漏浆可以实现自封闭。微观观测表明高压注浆下浆液可以增加裂隙开度,注入更加微细的裂隙。最后,提出未来注浆材料的发展方向。In response to the problems of large deformation,fracture closure and poor permeability of the surrounding rocks in the weak rock roadways of the 1000 m or deeper coal mines,it is required that the grouting material has good injectability,fast solidification speed,high early strength,and strong bonding performance.A new method of synergistic preparation of inorganic grouting materials was designed using“component optimization+ultra-fine+nano-reinforcement+organic modification”.An inorganic grouting material with an optimum composition ratio of 50∶40∶10 for the ternary cementing system of calcium sulphate aluminate,gypsum and lime was developed.After ultra grinding,the compressive strength of the concretion increased by 163.0%within 4 hours,achieving initial early strength and rapid solidification.A nano-lithium-aluminium hydrotalcite reinforcement material with synergistic effects of nano-nucleationinduced crystallization and lithium ion promotion was developed,resulting in a 183.7%increase in the 2 h strength of the ultra grinding grouting material.The organic modifier with directional coupling effect at the coal-rock interface was synthesized,which formed a bridge through bonding with the grout and coal interface,significantly improving the bonding between the slurry concretion and the coal rock interface.The synergistically prodeuced inorganic-organic composite grouting reinforcement materials has small particle size(D95<10μm),fast setting(<8 min),high early strength(2 h strength 11.5 MPa),and strong bonding performance(sandstone bonding strength 3.12 MPa).

关 键 词：千米深井 软岩大巷 组分优化 超细化 纳米增强 有机调节剂 注浆加固 

分 类 号：TD353[矿业工程—矿井建设]