Study on the Risk of Clogging of Cutterhead in Earth Pressure Balance Shield Tunneling in Loess Stratum
To explore the adhesive characteristics of muck from EPB shield tunneling in loess stratum,a series of tests were conducted using muck samples in the second phase of the Hanjiang-to-Weihe River Water Diversion Project in Xi'an.These tests include the liquid and plastic limit combined test,stirring adhesion tests,and fluidity tests.The study analyzes the effects of three different additives on the average adhesion ratio,consistency index,and fluidity of loess.The results show that:for sand-loess mixed samples,as the sand content increases,the average adhesion ratio decreases while fluidity increases.For illite-loess mixed samples,as the illite content increases,the average adhesion ratio decreases,the consistency index gradually increases,and fluidity shows a slight increase.For montmorillonite-loess mixed samples,as the montmorillonite content increases,the average adhesion ratio slightly decreases,the consistency index first increases and then stabilizes around 0.75,and fluidity first increases and then decreases.Overall,adding sand to loess effectively reduces adhesion,while adding illite or montmorillonite increases the risk of clogging,with montmorillonite having a more significant impact.This study comprehensively evaluates the adhesion characteristics of muck and the risk of shield tunneling clogging using three indicators,providing a reference for similar engineering projects.
shield tunnelloessadhesionfluidityrisk of clogging
万方数据
维普
