交通荷载作用下路桥过渡段沉降影响的有限元分析

摘要

In this paper, the finite element analysis is carried out to study the settlement of road-bridge transition section under the action of traffic loading.The results show that with the increase of the height of the road-bridge transition section, the maximum settlement value increases, when the ratio is increased from 1∶3 to 1∶6, sedimentation value increased, but smaller amplitude, slope of road-bridge transition section settlement is very small.With the increase of the transition period of road-bridge packing density, sedimentation value has increased, while the road-bridge transition gradually to the maximum settlement point near the abutment.Transition density value should be moderate, not too large.The settlement increases with the deformation modulus decreases, the inverted trapezoid, are trapezoidal transition section at the end of the settlement remained stable trend, the maximum settlement is basically the same, the transition form only has influence on the settling velocity has no obvious effect on the final settlement.The measured value of subgrade settlement is slightly smaller than the numerical value, and the two have a consistent settlement trend.The numerical analysis method is an effective method to predict the settlement of subgrade, which can reflect the change process of subgrade settlement.%通过有限元分析,对影响交通荷载作用下的路桥过渡段沉降进行了研究.结果表明,随着路桥过渡段高度的增加,最大沉降值也随之增大,当桥墩台北回填过渡段原地面坡比从1∶3增加到1∶6时,沉降值有所增大,但变化幅度较小,坡比对路桥过渡段沉降影响非常小.随着路桥过渡段填料密度的增大,沉降值也呈增加趋势,同时路桥过渡段最大沉降点逐渐向桥台靠近.过渡段密度取值要适中,不要太大.沉降随变形模量的增大而不断减小,在倒梯形、正梯形过渡段末端,沉降量保持稳定趋势,最大沉降基本相同,过渡段的形式只对沉降速度有影响,对最终沉降量没有明显影响.路基沉降实测值要稍小于数值模拟值,两者具有一致的沉降趋势,数值分析方法预测路基沉降的一种有效方法,对路基沉降变化过程可很好进行反映.