改性灌浆材料的开发及其在巷道修复工程中的应用,Geofluids

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改性灌浆材料的开发及其在巷道修复工程中的应用
Geofluids ( IF 1.2 ) Pub Date : 2021-03-04 , DOI: 10.1155/2021/8873542
Yang Yu ₁ , Zhengyuan Qin ₂ , Xiangyu Wang ₃ , Lianying Zhang ₁ , Dingchao Chen ₁ , Siyu Zhu ₁

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煤矿巷道注浆成功的原因在于早期强度高，流动性好，泵送方便，这是非常不成功的，但是现有的注浆材料难以同时实现上述特性。因此，开发了一种改性的灌浆材料，其由两种干燥的材料A和B组成，它们分别与水混合并等量混合。通过实验室正交试验测试了不同比例的改性灌浆材料的物理力学性能，得出了最佳的灌浆材料与添加剂的比例：（1）水灰比为0.8：1；（2）基础材料：水泥，粉煤灰，膨润土和水的质量比为1∶0.3∶0.1∶1.44；（3）外加剂：减水剂C，促进剂D的质量比，缓凝剂E为1.5％：0.05％：0.3％。利用数值模拟方法，从泥浆流态，扩散范围，灌浆参数等方面对改性灌浆材料的基本性能进行了研究，揭示了泥浆对巷道破碎围岩性能的强化机理：（ 1）注浆压力是影响泥浆扩散半径的主要因素；（2）改善巷道围岩的力学性能，减少围岩的塑性区和变形，通过注浆加固提高锚索的主动支撑功能；（3）提高了巷道的控制效果，通过注浆加固实现了巷道围岩锚固结构的平衡承载。在此基础上，将改性后的灌浆材料应用于巷道维修和加固工程实践中。现场监测数据表明，采用注浆材料进行巷道维修加固技术指导生产实践，因为巷道围岩的控制效果良好，且注浆材料具有广阔的应用前景。

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Development of Modified Grouting Material and Its Application in Roadway Repair Engineering

It is very extraordinary for the success of coal mine roadway grouting with the following factors of high early strength, good fluidity, and convenient pumping, but the existing grouting materials make it difficult to achieve the above characteristics at the same time. Therefore, a modified grouting material is developed, which is composed of two kinds of dry materials A and B, which are mixed with water and in equal amounts. The physical and mechanical properties of modified grouting materials under different ratios were tested by laboratory orthogonal test, and the optimal ratio of grouting materials and additives was obtained: (1) the water-cement ratio is 0.8 : 1; (2) base material: the mass ratio of cement, fly ash, bentonite, and water is 1 : 0.3 : 0.1 : 1.44; (3) admixture: the mass ratio of water reducer C, accelerator D, and retarder E is 1.5% : 0.05% : 0.3%. The basic properties of the modified grouting materials were studied from the aspects of slurry flow state, diffusion range, and grouting parameters by using the numerical simulation method, and the reinforcement mechanism of slurry to the broken surrounding rock properties of the roadway was revealed: (1) the grouting pressure is the main factor affecting the slurry diffusion radius; (2) the mechanical properties of the roadway surrounding rock are improved, the plastic zone and deformation of surrounding rock are reduced, and the active support function of the anchor and cable is enhanced through grouting reinforcement; (3) the control effect of the roadway is improved, and the balanced bearing with anchorage structure of the roadway surrounding rock is realized through grouting reinforcement. On this basis, the modified grouting material is applied to roadway repair and reinforcement engineering practice. The field monitoring data show that the production practices were guided by roadway repair and reinforcement technology with the modified grouting material, as the core of the roadway surrounding rock control effect is good, and the modified grouting material has a wide range of application prospects.

更新日期：2021-03-05

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