水泥基速凝浆液裂隙扩散机制与压力特性试验研究

Fracture defusing mechanism and pressure characteristic tests of rapid setting cement-based grouts

水泥基速凝浆液广泛应用于富水裂隙围岩注浆工程。为研究水泥基速凝浆液在裂隙注浆中的扩散机制与压力特性,选取水泥-水玻璃浆液及高聚物改性水泥浆液,采用不同水灰比及混合体积,开展了静水条件下单一平板裂隙的注浆扩散模型试验,通过监测浆液的注浆扩散形态和注浆过程中不同测点的压力变化,研究了水泥基速凝浆液的静水扩散规律和注浆扩散压力分布规律。试验结果表明,水泥-水玻璃浆液和高聚物改性水泥浆液具有相似的扩散形态和压力分布变化,两者的显著差别在于高聚物改性水泥浆液扩散所需的注浆压力明显小于水泥-水玻璃浆液,且凝结固化时间相对较长,有利于延长注浆扩散距离。研究结果应用于张马屯铁矿注浆堵水工程,解决了裂隙岩体渗漏水问题,实现了围岩稳定性控制。研究成果具有一定的理论和实践意义,对类似工程具有参考价值。

Rapid setting cement-based grouts are widely used in water rich fracture grouting engineering. In order to study the defusing mechanism in fracture and pressure characteristic of rapid setting cement-based grouts, single planet fracture grouting model text under hydrostatic conditions were carried out using cement-silicate grout and polymer modified grout with different proportions. The diffusing behavior and the pressure variations in different measuring points were recorded to study the laws of hydrostatic diffusion of rapid setting cement-based grouts and the pressure distribution of grout diffusion. Results show that cement-silicate grout and polymer modified grout are similar in diffusing behavior and variation of pressure distribution, while the diffusing pressure of the cement-silicate grout is obviously higher than cement-silicate grout polymer modified grout, which has a relatively longer condensate and solidifying time and is conducive to improving the diffusing distance. The results are used in Zhangmatun iron mine with success in governing the water leakage in rock fracture and stability of the surrounding rock, which has a certain theoretical and practical significance and offers an reference for similar projects.