Numerical Research on Water Tightness of a New Type of Water Stopping Device at the Shield Machine Receiving Shaft

Abstract

To meet the water stopping requirement of the shield machine receiving shaft, preliminary calculations are carried out on the structural design of a new type of water stopping device. The device is arranged on the inner arc surface of the embedded parts of the inner lining hole ring of the shield machine receiving shaft. By inflating the inflatable bag, the restriction of the limit bending steel plate is overcome, the flap is made to rotate to contact the shield machine shell to fill the gap between the shield machine and the hole ring, and waterproof materials are injected into the grouting pipe to stop leakage and water. For verifying the water stopping effect of the above structures and preparing for the later indoor model test, the numerical research work is mainly carried out on the standard section model. The nonlinear deformation process of the inflatable bag expansion and the contact with the embedded parts of the hole ring, the flap, and other components are analyzed, and the selection and bearing capacities of rubber materials are confirmed, so as to provide reference and guidance for the indoor model test. Combining the calculation results of different working conditions and the results of the indoor model pre-test, it is concluded that the stresses of each component do not exceed the corresponding allowable values, which indicates that the current design of the water stopping device is reasonable and feasible, and can be applied to test research.