长距离顶管工程中注浆减摩作用机理及效果分析

Analysis on Mechanism and Effects of Slurry Injecting in Reducing Friction in Long Distance Pipe Jacking Project

摘要:

长距离顶管施工中除了克服迎面阻力外，尚需克服巨大的侧面摩擦阻力，故直接顶进非常困难。探讨了利用膨润土泥浆注浆以减小顶进阻力的技术。对注浆材料的结构、注浆工艺和减摩机理进行了较为系统的阐述，并结合工程实例对长距离顶管中顶进力的理论值与实际值做了比较。结果表明，注浆减摩效果十分明显。该技术值得在实际工程中推广应用。

Abstract:

Long distance pipe jacking is very difficult， as both the soil or rocks in the front of the cutting head and the great side frictional resistance need to be overcome. The article discussed the technique of using bentonite slurry to reduce the jacking resistance; systematically described grouting material structure， grouting technology and the mechanism of friction reduction and make the comparison between theoretical and actual values of jacking force in long distance pipe jacking based on the engineering case. The results showed that the effect of friction reduction by slurry injection was very noticeable， which is worth being applied in the similar projects.