采空区垮落带注浆加固实验

Experiment study of grouting reinforcement on caving zone in goaf

防治铁路下伏采空区在列车运行动载荷作用下,诱发原本处于相对平衡状态的垮落带岩体重新"活化",保证快速运行列车的安全,通过分析采空区垮落带的破坏形式和特征及水泥砂浆注浆作用机理,进行水泥砂浆配比实验和采空区垮落带注浆模拟实验.研究结果表明:砂浆的稠度、表观密度和7d强度与水玻璃的掺量密切相关;砂浆易于充填采空区垮落矸石间隙并形成强度很高的结石体,大幅度提高了垮落带的稳定性和承载能力,为铁路下伏采空区注浆治理设计提供了科学依据.

In order to prevent the rock mass in a relatively balanced condition in a goaf area under railway from bring activated again with the dynamic loading of running train, and warrant the safety of fast running train, this study analyzes the destruction form and characteristics of caving zone in goal and the grouting mechanism. In this study, the experiments of cement mortar matching and the simulation of grouting into caving zone in goaf are conducted. The results show that the mortar concentration and apparent density are closely related to the dosage of water-glass. The mortar is easily filled into the gap of caving gangue in goal and forms high strength stone body, and greatly improves the stability and bearing capability at caving zone. The study provides a scientific basis for grouting design in goafunder railway line.