水泥基浆材室内试验及其边坡加固应用研究

Laboratory Test of Cement Matrix Grouting Material and Its Application in Slope Reinforcement

边坡常伴随崩塌、滑坡和泥石流等灾害,严重危害着工程周围群众的生命财产安全,研究边坡加固意义重大。将注浆液压入破碎边坡内部,通过对软弱岩土体的加固可提高边坡稳定性。通过室内试验,确定了5种水泥基注浆材料的最佳配比、物理力学性能和初凝终凝时间。在推导了注浆压力和注浆扩散半径的公式后,结合溆怀高速边坡加固工程实践,提出并实施了具体注浆加固方案。最后,通过数值模拟和现场检测对注浆加固效果进行了验证。结果表明：注浆改善了土层物理力学性质,提高了土体强度及承载力,水泥黄砂粉煤灰注浆加固切实可行,效果显著。

Slope is often associated with collapse, landslides, mudslides and other disasters, which is endangering the lives and property of the masses around the project seriously. It is significant to take a research on slope reinforcement. The slope stability can be reinforced by plunging the cement liquid into the fractured rock mass of the slope. The optimum mix ratio, physical and mechanical properties, initial setting time and final setting time of five different kinds of cement based grouting material were determined by the laboratory test. The equations pressure and diffusion radius of grouting were provided. The layout of grouting reinforcement was presented and put into effect on the base of a slope in Xu-Huai Highway. The reinforcement effect was verified by numerical simulation and field test. Results show： the physical and mechanical properties can be improved; the strength and bearing capacity of soil can be enhanced. It is practicable and remarkable for grouting reinforcement by the cement matrix comprised with cement, yellow ground and fly ash.