School of Materials Science and Engineering, Henan Polytechnic University
Henan Key Laboratory of Materials on Deep-Earth Engineering

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例为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<10 μm），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 1 000 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-nucleation-induced 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 < 10 μm), fast setting (< 8 min), high early strength (2 h strength 11.5 MPa), and strong bonding performance (sandstone bonding strength 3.12 MPa). The inorganic-organic composite grouting reinforcement materials with "high early strength, high injectability and high bonding" properties for weak rocks in deep mines have been developed. The field application test adopted high-pressure grouting method, and the grout can be injected into large and micro cracks of the coal sample, connecting isolated cracks to achieve high-pressure splitting, and the loose coal mass was compacted. Microscopic observation showed that the grout under high pressure injection can increase the fissure opening and inject more grout into microfissures. Finally, the development direction of grouting materials in the future is proposed.

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)

管学茂，李雪峰，张海波，等. 深井软岩无机有机复合注浆加固材料研发与应用[J]. 煤炭科学技术，2023，51（8）：1−11

GUAN Xuemao，LI Xuefeng，ZHANG Haibo，et al. Research and application of inorganic and organic composite grouting reinforcement materials in deep weak rock[J]. Coal Science and Technology，2023，51（8）：1−11