At the conditions of high oil-gas ratio,the volume change of the liquid and gas,and the reasons of affect the pump efficiency of the pump during the swabbing are analyzed in this paper,and it is proposed that the function of anti-gas-pump can eliminate free gas in the clear span and reducing solution gas in the liquid of clear span as much as possible.

Research purposes: Aims at the ground movement distribution and transformation during parallel shield tunnel construction,infections on the ground movement value due to effective factors(such as surrounding soil condition,tunnel covering thickness,clear distance and advance force etc) are also probed in.