Differential Settlement Control of Road Bridge Transition Section in Deep Soft Soil Area

The differential settlement of road bridge transition section seriously affects the safety and comfort of driving. According to the characteristics of deep soft soil area, such as large depth of soft foundation, high difficulty of soft foundation treatment and high cost, three differential settlement control schemes of rigid transition, flexible transition and rigid flexible combination transition are summarized. According to the three transition schemes, prestressed pipe pile composite foundation, vacuum preloading + air bubble mixed light soil embankment and long short pile composite foundation are respectively adopted for engineering practice. Combined with construction parameters and monitoring data, the reinforcement effect is analyzed and studied, and the technical and economic comparison of three transition schemes for soft foundation treatment is made. The results show that the three transition schemes are effective and feasible, but there are some differences in construction period, settlement control effect and economy. In general, when the filling height is fixed, the cost of rigid transition and rigid flexible transition is relatively high, and the greater the treatment depth, the more obvious the advantage of flexible transition in cost.