Study on Soil Disturbance Caused by Shield Tunneling in Sandy Strata

Abstract Shield tunneling and construction in sandy soil have great safety risks, so it is necessary to study the disturbance caused by soil. However, law of still relatively vague, this paper relies on actual tunnel project, through high-density, close monitoring; The settlement around shield studied analyzed. research shows that basically stable after tail leaves monitoring section about twice length machine; During strata, sand upper part very easy collapse, thus forming a “collapse arch”. formation feature will be one reasons for accidents large diameter machines; remarkable water rich layer maximum horizontal displacement measuring points at different locations occurs same depth, does not develop from center 45-φ/2 diffusion angle; deformation during far less than vertical deformation, can used better analyze impact disturbance.