铁路路基地基处理极限状态法试设计分析

Analysis and Trail Design of Railway Foundation Treatment Based on Limit State Method

我国铁路工程地基处理技术目前还停留在容许应力法的设计阶段,这种方法在设计过程中计算简便,积累了多年的设计经验,已经形成了稳定可靠的设计体系。但容许应力法无法反应各种因素对路基安全的真实影响程度,存在一定的局限性,制约地基处理技术的发展与应用。随着现代化铁路的建设和科研水平的不断发展与进步,我国铁路行业编写了极限状态法设计暂行规范。通过运用两种不同设计方法,对实际工点进行复合地基承载力、复合地基工后沉降、整体稳定性计算,并对计算结果进行比较,提出两种设计方法的优缺点以及向极限状态法转变的可行性与必要性,为铁路路基极限状态法设计暂行规范中地基处理部分的修改完善提出相关建议。

The foundation treatment technology of railway engineering in our country is still in the design stage based on allowable stress method.This method is convenient and has accumulated many years of design experiences and has formed a stable design system.However,the allowable stress method can't reflect the true impacts of various factors on the safety of subgrade due to its limitations that restrict the development and application of foundation treatment technology.With the continuous development and progress of modern railway,provisional specifications for the limit state design method have been written by the railway industry.The bearing capacity of composite foundation,composite foundation settlement after construction,and the overall stability are calculated by means of two different design methods.Then the calculation results are compared,the advantages and disadvantages of the two design methods are put forward,and the feasibility and necessity of using the limit state method are addressed.Some suggestions are given for the modification and improvement of the foundation treatment in the design of railway foundation treatment with the limit state method.