新型聚氨酯无机复合注浆材料工程性能分析

Engineering Performance Analysis of New Polyurethane Inorganic Composite Grouting Material

水利工程建设中常会遇到隧道围岩或边坡稳定性较差的问题,利用无机复合注浆材料进行岩土体的加固是保证工程安全性的重要手段。为研究聚氨酯无机复合注浆材料的工程性能,室内制备不同聚氨酯浓度的新型聚氨酯无机复合注浆材料,并对其开展浆液流动性、浆液凝结时间和单轴力学强度试验。研究发现:(1)聚氨酯材料的浓度越高,则新型聚氨酯无机复合注浆材料的流动性越低、扩散半径越小。(2)随着聚氨酯材料浓度的增大,新型聚氨酯无机复合注浆材料的凝结时间显著变短、快速凝结性能明显增强。(3)聚氨酯对注浆材料的力学性能有明显的不利影响,但掺聚氨酯后的注浆材料均显著低于不掺聚氨酯的注浆材料。研究成果可为我国水利工程建设提供一定的借鉴作用。

The construction of water conservancy projects often encounter the problem of poor stability of tunnel surrounding rock or slope. The reinforcement of rock and soil mass with inorganic composite grouting materials is an important means to ensure the safety of the project. In order to study the engineering properties of polyurethane based inorganic composite grouting materials, new polyurethane based inorganic composite grouting materials with different polyurethane concentrations were prepared indoors, and the tests of slurry fluidity, slurry setting time, compressive strength and flexural strength were carried out. It is found that(1)the higher the concentration of polyurethane material, the lower the fluidity and the smaller the diffusion radius of the new polyurethane based inorganic composite grouting material.(2) With the increase of polyurethane material concentration, the setting time of the new polyurethane inorganic composite grouting material is significantly shorter and the rapid setting performance is significantly enhanced.(3) Polyurethane has obvious adverse effects on the mechanical properties of grouting materials, the grouting materials mixed with polyurethane are significantly lower than those without polyurethane. The research results provide a certain reference for the construction of water conservancy projects in China.