基于离心模型试验的地基附加应力修正

吴丽君; 蒋关鲁; 李安洪

doi:10.3969/j.issn.0258-2724.2015.04.014

基于离心模型试验的地基附加应力修正

doi: 10.3969/j.issn.0258-2724.2015.04.014

基金项目:

铁道部科技研究开发计划资助项目(2010G003-F)

详细信息

作者简介:
吴丽君(1981-),女,博士,研究方向为非饱和土、软弱地基加固技术,E-mail:fwulijun@163.com

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出版历程
- 收稿日期: 2014-09-17
- 刊出日期: 2015-08-25

Revision of Additional Stress in Soils Based on Centrifuge Model Tests

摘要

摘要: 为提高对路基沉降的精度控制,对2种中等压缩性土地基在路基自重作用下的地基附加应力分布规律进行了离心模型试验,并通过PLAXIS2D有限元数值计算和现场测试参数反算地基附加应力进行了验证.基于试验结果,提出了考虑路基宽高比影响的路基中心处地基附加应力修正计算方法.研究结果表明:在路基荷载作用下,附加应力在浅层地基中衰减较快,随地基深度增大,衰减逐渐减慢,与Boussinesq解得到的地基附加应力衰减曲线存在显著差异;修正方法计算的地基附加应力与现场测试参数的反算结果基本吻合.
- 地基附加应力 /
- 中等压缩性土 /
- 路基宽高比 /
- 离心模型试验 /
- 现场试验
Abstract: To improve the accuracy of embankment settlement control of high-speed railway, centrifuge model tests with different loading methods were conducted to investigate the distribution of additional stress in two medium-compression soils under subgrade load. In addition, numerical computations with PLAXIS2D finite element program and field tests were performed to verify the experimental distribution of additional stress. On the test results, a modified calculation method for additional stress considering the effect of width-to-height ratio was proposed. The research results show that additional stress decreases more quickly near the foundation surface, but its attenuation is gradually decelerated with depth increasing. There exist a significant difference between the distribution of additional stress based on the Boussinesq solution and that acquired from the centrifuge model tests. Furthermore, the additional stress calculated by the modified method approaches the calculation result based on the field test data.
- additional stress in foundation /
- medium-compression soil /
- width-to-height ratio /
- centrifuge model test /
- field test

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