基于正交试验的破碎煤岩浅层注浆材料试验研究

Experimental Research on Material for Shallow Grouting of Crushed Coal and Rock Based on Orthogonal Test

注浆加固是解决破碎围岩体变形的有效方法之一,但是浆液渗漏和泥浆流失的问题严重制约了注浆的发展。以自主研发的矿物基注浆材料为基础,通过控制单一变量和正交试验分析了早强改性剂对矿物基注浆材料性能的影响,得到了材料固化的抗压强度和材料工况,确定了3种早强改性剂的最佳比例为1∶12∶2,含量为注浆原材料2.62%时,矿物基复合注浆材料性能最好。井下工业试验表明,通过改性的矿物基注浆材料采用深-浅结合的注浆方式可以有效解决泥浆渗漏和泥浆流失的问题。整体注浆效果得到改善,巷道变形得到有效控制。

Grouting reinforcement is one of the effective methods to solve the deformation of broken surrounding rock mass, but the problems of slurry leakage and mud loss have severely restricted the development of grouting. Based on the self-developed mineral-based grouting material, this paper analyzed the influence of early strength modifiers on the performance of mineral-based grouting materials by controlling single variables and orthogonal tests. The compressive strength and material working condition of material solidification were obtained. The optimum ratio of three early strength modifier was determined to be 1∶12∶2.When the content was 2.62% of the grouting raw material, the performance of mineral based composite grouting material was the best. The underground industrial test shows that the deep-shallow combined grouting method through the modified mineral-based grouting material can effectively solve the problems of mud leakage and mud loss. The overall grouting effect is improved, and the roadway deformation is effectively controlled.