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为提高高速公路软基过渡段车辆行驶的舒适性,通过建立车辆垂向振动分析模型和有限元仿真模型,分别分析了过渡段长度和分段与高速公路软基过渡段差异沉降的关系。结果表明,过渡段长度和分段对高速公路软基过渡段均衡沉降影响较大。车辆垂向振动加速度随着差异沉降量和沉降坡度差的增大而增大;对于标准速度为120km/h的高速公路,当过渡段长度大于8m时,采用的均衡沉降控制标准宜为差异沉降量,差异沉降控制标准为差异沉降量2.3cm,当过渡段长度小于8m时,采用的均衡沉降控制标准宜为沉降坡度差,差异沉降控制标准为沉降坡度差0.3%;采用两种桩间距比采用同种桩间距的过渡段差异沉降减少约35%~50%。
In order to improve the comfort of vehicle driving in soft foundation transition section of expressway, the relationship between the length of transition section and the differential settlement of transitional section of soft ground in expressway was analyzed respectively by establishing vertical vibration analysis model and finite element simulation model. The results show that the length and segment of the transitional section have a great influence on the equilibrium settlement of the transitional section of soft foundation in expressway. The vertical vibration acceleration of the vehicle increases with the difference between the differential settlement and the gradient of settlement; for the standard speed of 120km / h expressway, when the transition length is greater than 8m, the equilibrium settlement control standard should be differential settlement When the length of the transition section is less than 8m, the standard of equilibrium settlement control adopted should be the gradient of settlement, and the standard of differential settlement shall be 0.3% of the gradient of settlement; the difference between two kinds of pile spacing ratio The difference settlement of the transition section using the same kind of pile spacing reduces about 35% ~ 50%.