路桥过渡段的三维数值模拟分析

根据秦沈客运专线DK266+521路桥过渡段结构形式及过渡段的路基面纵向、横向的动应力测试结果，采用三维有限差分数值计算，模拟了动荷载作用下过渡段的沉降变形分别在线路纵向、横向及路基深度方向的变化规律及过渡段设置形式、材料刚度、过渡段的尺寸对沉降变形的影响。结果表明，正梯形过渡段的性能优于倒梯形过渡段；过渡段碎石刚度必须满足一定的要求；过渡段梯形上下底宽的变化对过渡段沉降的影响不明显。

3D numerical reasearch on bridge-subgrade transition

Based on the construction form of transition zone and the longitudinal and transverse stresses measured from the DK266+521 bridge-subgrade transition in Qin-Shen passenger special line, the longitudinal, transverse and in-depth settlements of track transition under traveling load are analyzed by finite-difference program FLAC3D, and the settlement with different factors such as format, material stiffness, and dimension is also studied. The results show that: the engineering effect of track transition in trapezium form is better than in inverse trapezium form; the graded broken stone should be intensive enough; the size of trapezium has little effect on settlement.