地铁暗挖隧道密贴下穿污水箱涵变形特征研究.

In order to solve the problem for controlling the deformation of the large-section sewage box culvert induced by the construction of an adjacent bored tunnel beneath, the code Midas GTS NX was performed to analyze the deformation characteristics of the existing box culvert with the different sewage flow rates induced by the construction of the bored tunnel beneath. The effects of the new tunnel construction were evaluated by field monitoring. The results show that changes in the sewage loads have a great influence on the magnitude of the settlements of the box culvert. The maximum settlement of the box culvert filled with sewage is 1. 75 times that of the box culvert without sewage. When the height of sewage is controlled below 0. 754 m, the safety of the box culvert could be ensured. The box culvert is greatly disturbed during the construction of the dewatering and excavation within the distance of about 13 m from the box culvert. The settlement of the box culvert at the stage accounted for 70% ~ 75% of the total settlement. The modified Peck formula using the superposition method was applied to describe the settlement curve of the box culvert. The settlement trough width of box culvert ranges from 6. 32 m to 6. 9 m in the construction of the bored tunnel. The fitting curve of the settlement of the box culvert is finally in the shape of “U”. [ABSTRACT FROM AUTHOR]