Centrifugal model tests on settlement of structures caused by tunnel excavation
摘要
In the construction of underground tunnels, the route selection often inevitably leads to the situation of under-passing buildings. In order to ensure the safety and stability of the superstructures, it is necessary to control the settlement of the building foundation caused by the underpassing tunnel. In the construction of underpassing tunnel, the settlement changes of buildings with different foundation types are different. Through the three-dimensional centrifugal model tests, the settlements of shallow foundation office buildings and pile foundation workshop caused by the excavation of double-tube large tunnel are studied. Due to the stress release caused by tunnel excavation, the measured settlement of building foundation increases with tunnel excavation. The settlement value at the position close to the tunnel excavation is larger, and that at the position far from the excavation is smaller. The settlement value of pile foundation is obviously smaller than that of the shallow foundation buildings. However, the settlement value at the near point of excavation is greater than that at the far point, with a maximum difference of 2.8 times. At the initial stage of excavation, the differential settlement of the shallow foundation is obviously higher than that of the pile foundation, and the maximum value can be 6 times. After the tunnel excavation, the differential settlement of the pile foundation is less than that of the shallow foundation.