关于铁路路基地基承载力的讨论

现行不同铁路规范对于路基地基承载力的要求各不相同,设计人员对规范有不同的理解,有时会造成设计偏于保守,对铁路路基地基承载力设计方法进行探讨。地基容许承载力和地基承载力的特征值是地基基本处于弹性变形的界限,与基础是刚性还是柔性无关。对于有砟轨道,可允许土体局部进入塑性破坏区,可以在规范的基础上将承载力要求适当放宽。根据既有资料,提出用于极限状态设计的承载力分项系数,可为铁路地基处理极限状态设计方法提供参考。

Discussions on Bearing Capacity of Railway Embankment Foundation

The requirement for bearing capacity of foundation is not accordant in different current codes and designers may have different understanding of the codes,which may result in conservative design.This paper focuses on the bearing capacity of foundation under embankment load. The allowable bearing capacity and the characteristic bearing capacity are limits for elastic deformation irrespective of rigid foundation or flexible base foundation. It's appropriate to allow the foundation to be plastic partly for ballasted track,and the requirement for bearing capacity of foundation can be eased aptly. According to the existing information,the partial factor of bearing capacity is proposed,which could provide reference for limit design of railway foundation treatment.