顶管隧道膨润土泥浆对地层扰动影响的离心机实验研究

为了探究顶管隧道膨润土泥浆的减阻机制及其性能对地层扰动的影响规律，结合地层和膨润土泥浆的特点，对顶管隧道施工过程中摩擦阻力和地层沉降的产生机制进行了理论分析；采用岩土离心模型实验手段对该机制进行了验证；自主研发了适用于离心模型实验的顶管注浆模拟系统，可以采用不同的泥浆材料与配合比等进行实验研究．通过对实验结果与“减阻泥浆套”现象分析，总结了泥浆黏度、失水量等对地层扰动的影响规律．这些成果在今后类似的工程中具有极好的参考价值． 

Influence of pipe jacking bentonite mud performance on stratum disturbance: an experimental centrifugal study

With widespread use of pipe jacking in recent years, requirements for disturbance control of pipe jacking method are increasing．Bentonite mud is the main disturbance reduction measure of pipe jacking method, but little is known about the influence of its own performance on disturbance control．Here we conducted a theoretical analysis of frictional resistance and formation settlement in the pipe jacking process．We did geotechnical centrifuge experiment．In a self-developed pipe jacking engineering grouting simulation system, different types of mud were used．We discovered the phenomenon of “friction reduction mud screen” and examined influence of mud viscosity and mud water loss on frictional resistance and formation settlement．