Prediction of Ground Subsidence Caused by Shield Tunnel Construction Under Hidden Karst Cave

Relied on the tunnel engineering in the karst area of Dalian Metro Line 5, the indoor model test was designed and carried out based on the similarity theory. The inversion analysis was carried out through the test data. The engineering data of subway construction in coastal areas and the karst geological conditions in Dalian area were counted. The range of the width of the stratum settlement trough caused by shield tunnel construction in Dalian area was proposed. Based on the principle of similar soil loss, the linear relationship and its influence parameters between S max,0 / S max,z and (1 − Hz / h ) were deduced. The influence of cave size and roof thickness on ground settlement was analyzed. Based on the multiple linear regression method, the prediction formula of the maximum ground settlement caused by shield excavation under the condition of hidden karst cave was established, and the applicable scope was given. Furthermore, an example was given to verify the results. The contents of this paper can provide reference for similar projects.