THE MODEL TEST OF THE IRREGULAR FOUNDATION PIT OF THE SUBWAY BASED ON THE RESPECTIVE SIMULATION THEORY

According to the foundation pit excavation of the Lücuo station in Xiamen Subway Line 1, the similar ratio of the key parameters of the model is obtained with the respective similitude theory. Besides, the whole model is made and the monitoring system is designed. By simulating the actual excavation process and analyzing the monitoring data, the ground settlement, the deformation and stress distribution of the diaphragm are given. The results show that, the ground settlement is negatively correlated with the distance away from the diaphragm and positively correlated with the length of the diaphragm and the depth of excavation. The shapes of the curve are related to the total settlement caused by the excavation unloading, and the spatial and corner effect are obvious. The ground settlement mainly occurs in the stage of excavation. The influence of excavation on the ground settlement is gradually reduced with the excavation progress developing. The bending moment of the diaphragm is positively correlated with depth of excavation. The maximum bending moment of the diaphragm is at the excavation face of the foundation pit.