列车荷载作用下重力式路肩墙土压力算法探讨

Exploration on the Earth Pressure Algorithm of Gravity Shoulder Retaining Wall under the Train Load

研究目的:铁路工程中列车荷载作用下重力式路肩墙土压力,一般采用路基手册算法,也可以参考采用"扩散角45°法"和"扩散角45°+φ/2法",但上述算法均存在不足。本文提出一种新的算法"三破裂角法",以弥补上述算法的不足,其计算结果更为合理,可为工程设计人员提供一定的参考。研究结论:(1)路基手册算法存在土压力的作用范围和强度均随墙高变化而变化的不足;(2)"扩散角45°法"、"扩散角45°+φ/2法"可弥补路基手册算法的不足,但依然采用了简单的假设条件,没有考虑填料性质或边界条件对土压力作用范围的影响;(3)本文提出的"三破裂角法"弥补了上述算法的不足,充分考虑了填料性质和边界条件对土压力作用范围的影响,其计算结果更为合理;(4)"三破裂角法"可用于铁路路基重力式路肩挡土墙设计,也可用于其他路肩墙或路堤墙设计,其设计结果更为可靠合理。

Research purposes： The earth pressure algorithm of gravity shoulder retaining wall under vertical loads of train in railway engineeringusually comes from the subgrade manual. And that can also reference the ＂ diffusion angle 45° gmethod＂ or ＂ diffusion angle 45° ＋φ2 method＂. But all the algorithms above are inadequate. This paper put forward a new algorithm that can be named＂ three rupture angle method＂. The new algorithm can make up the deficiency of the above algorithms. And the results of the new algorithm are more reasonable, that can provide reference for engineering designers. Research conclusions： （ 1 ） The scope and intensity of soil of the wall. （ 2 ） The ＂ diffusion angle 45° method＂ and pressure by subgrade manual method changes with the height diffusion angle 45° ＋φ/2 method＂ can make up for the deficiency ofsubgrade manual method. But the two methods still using the simple assumptions and the influence of the filler or the boundary conditions are not considered. （ 3 ） This paper put forward＂ three rupture angle method＂ that can make up the shortage of the above algorithm. The influences of filler properties and boundary conditions on the range of soil pressure were fully considered. The calculation results are more reasonable. （4）The ＂three rupture angle method＂ can be used in railway subgrade gravity retaining wall design. And it can also be used for other shoulder wall or embankment wall design. The design results are more reasonable and reliable.