冻结饱和标准砂压缩性试验研究

孙晓宇; 齐吉琳; 尹振宇

doi:10.11779/CJGE201809020

冻结饱和标准砂压缩性试验研究 English Version

1. 北京建筑大学土木与交通工程学院,北京 100044;
2. 南特中央理工大学,南特法国 44300

基金项目: 国家自然科学基金面上项目（41572268）; 北京市自然科学基金委-市教委联合重点项目（KZ201810016020）; 北京市属高等学校高层次人才引进与培养计划项目（CIT&TCD20150101）

详细信息

作者简介:
孙晓宇(1994- ),女,浙江义乌人,主要从事寒区岩土工程和特殊土力学等方面的学习和研究。E-mail: 136527826@qq.com。

通讯作者:
齐吉琳，E-mail：jilinqi@bucea.edu.cn

中图分类号: TU43
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出版历程
- 收稿日期: 2017-12-03
- 发布日期: 2018-09-24

Experimental study on compressibility of frozen saturated ISO standard sand

1. School of Civil and Transportation Engineering, Beijing University of Civil Engineering and Architecture, Beijing 100044, China;
2. Ecole Centrale de Nantes, Nantes 44300, France

摘要

摘要: 在寒区进行高速公路和高速铁路等对变形要求严格的工程时,必须考虑冻土的压缩性。以冻结饱和标准砂为研究对象,利用自主研发的冻土侧限压缩仪开展不同温度下的分级加载试验。试验采用-0.5,-1.0,-2.0,-3.0和-5.0℃五级温度,压力分为1,2,3,5和10 MPa五级。根据试验结果得到e-σ_z和e-lgσ_z曲线,求得压缩系数和压缩指数,比较分析室温下的融土试样与不同温度下冻土试样的压缩系数和压缩指数随温度的变化,得到从正温到负温完整温度序列的试验规律。根据前人的模量公式得出相关参数,从而建立公式中参数与温度之间的关系。试验表明：饱和冻结标准砂压缩曲线与常温土相似;在高温条件下冻土的压缩性比较可观;冻土的压缩性受温度的影响十分显著,即压缩系数随温度的升高而增大,呈现指数函数的形式;模量公式中的参数与温度之间可建立一定的定量关系。
- 冻土 /
- 标准砂 /
- 压缩性 /
- 恒温变载 /
- 模量
Abstract: The compressibility of frozen soil must be taken into consideration when the deformation of highway and high-speed railway is strictly controlled in permafrost regions. The frozen saturated ISO standard sand is taken as the study object, and step load tests under different temperatures are carried out using a self-developed confined compression apparatus for frozen soils. The tests are conducted at the loads of 1, 2, 3, 5, 10 MPa and under temperatures of -0.5, -1.0, -2.0, -3.0, -5.0℃. The coefficient of compressibility and the compressibility index are obtained according to the e-σ_z and e-lgσ_z curves for both unfrozen and frozen samples at different temperatures. The experimental results of the complete temperature series from room temperature to negative temperature are then obtained. The correlation parameters are obtained according to the former modulus formulas, and the relationship between the parameters and the temperatures in the formulas is established. The test results indicate that the compression curve of frozen saturated ISO standard sand is similar to that of the samples under room temperature. For the warm frozen samples, the compressibility is considerable. The compressibility of frozen soil is closely related to temperature, i.e., the coefficient of compressibility increases with the increase of temperature in the form of exponential function. A certain quantitative relationship can be established between the parameters and the temperatures in the modulus formulas.
- frozen soil /
- ISO standard sand /
- compressibility /
- constant temperature step load /
- modulus

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参考文献(20)

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