路基加筋垫层土工格栅拉力计算方法研究

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摘要研究目的：土工格栅加筋垫层具有扩散应力、调整桩土应力比、提高地基承载力和减小不均匀沉降的作用，在铁路复合地基中得到了广泛应用，但目前格栅拉力的计算方法并不统一，因此有必要针对土工格栅拉力的计算方法展开系统研究，以期为铁路复合地基格栅垫层的设计提供参考。

研究结论：以武广客运专线为工程背景，总结了不同格栅拉力计算方法，建立平面有限元分析模型，在考虑不同格栅模量的条件下，分析了路基填筑过程中地基面沉降、土工格栅受力及桩土应力比的变化规律。填土高度增加到一定程度后，地基面沉降、土工格栅受力及桩土应力比增加趋缓，格栅模量的增加使土工格栅受力增加明显，加筋垫层的使用可以有效地解决桩顶应力集中的问题，对地基沉降能起到较好的控制作用。

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	周飞

关键词 ：路基, 土工格栅, 加筋垫层, 计算方法, 格栅拉力

Abstract：Research purposes:The geogrid has the features of the stress dispersion，adjusting pile － soil stress ratio，improving the foundation bearing capacity and decreasing the uneven settlement，so it is widely used in the railway composite foundation． But now there is no unified calculation method for the tensile force of the geogrid，so it is necessary to do the research on the calculation method for the tensile force of the geogrid in order to provide the reference to the design of the reinforced cushion of railway composite subgrade．

Research conclusions:Taking the Wuhan － Guabgzhou Passenger Dedicated Line as the engineering background，the different calculation methods for the tensile force of the geogrid were summarized． The plane finite element analysis model was established． The variation laws of the subgrade settlement，the load on the geogrid and the pile － soil stress ratio in process of subgrade filling were analyzed on consideration of the different geogrid modulus conditions．After the soil filling to a certain height，the increases of subgrade settlement，the load on the geogrid and pile － soil stress ratio became slow． The increase of geogrid modulus led to the obvious increase of the load on the geogrid． The use of reinforced cushion could effectively solve the problem of thestress concentration on the pile top problems and control the subgrade settlement．

Key words： subgrade geogrid reinforced cushion calculation method tensile force of geogrid

收稿日期: 2011-11-30

PACS:

U213

作者简介: 周飞，1981 年出生，男，工程师

引用本文:

周飞. 路基加筋垫层土工格栅拉力计算方法研究[J]. 铁道工程学报, 2012, 29(8): 40-44.
ZHOU Fei. Study on Calculation Method for Tensile Force of Geogrid in Reinforced Cushion of Subgrade. 铁道工程学报, 2012, 29(8): 40-44.

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http://tdgcxb.crec.cn/CN/ 或 http://tdgcxb.crec.cn/CN/Y2012/V29/I8/40

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