Study of Grease Escape of Tail Skin Sealing System with Earth Pressure Balance Shield Machine

Abstract

In this paper, the grease escape test of shield tail sealing system is carried out, and the variation law of grease escape pressure and escape rate is studied with shield tail clearance, grease cone penetration and grease pressure as variables. The results show: (1) The smaller the shield tail gap, the greater the grease escape pressure, and the grease escape pressure has a non-linear relationship with the shield tail gap. The higher the grease cone penetration, the lower the grease escape pressure under the same shield tail gap. (2) When the grease pressure is greater than the escape pressure, the escape rate of sealing grease increases with the increase of grease pressure under the same shield tail clearance. (3) In the range where the grease pressure is greater than the grease escape pressure and less than the grease resistance pressure, the grease escape rate is linearly related to the grease pressure under different working conditions. (4) There are two escape modes of grease: non-uniform escape and uniform escape.