季冻区低路堤土基强度与影响因素相关性

发布时间：2018-02-12 21:11

本文关键词： 季冻区低路堤土基强度影响因素吉林省塑性指数　出处：《吉林大学学报(地球科学版)》2015年03期 　论文类型：期刊论文

【摘要】：对吉林省高等级低路堤公路填土高度与最大冻深进行了调研,该地区低路堤填土高度为0.0~2.2m,钻孔数据表明路基最大冻深为距路表1.6~2.4m。选取3种不同塑性指数的路基土,采用正交表L16(45)进行了试验设计,应用静力成型法,使得土体在设定的含水率和压实度的水平下成型,并经历不同的冻融循环次数后,分别测试土体的无侧限抗压回弹模量。试验结果表明:1)对同一种土质,影响因素的大小排序为:含水率冻融次数压实度。2)随着含水率增大,土基强度接近线性减小;随着冻融次数的增加,土基强度逐渐减小,前2次冻融影响较大,之后幅度变小趋于稳定;随着压实度的增大,土基强度逐渐增大,增大幅度较小。3)采用指数函数对3种土的室内试验数据进行多元非线性拟合,拟合结果较好。
[Abstract]:This paper investigates the height and maximum freezing depth of high grade and low embankment highway in Jilin Province. The height of low embankment fill in this area is 0.02. 2m. the borehole data show that the maximum freezing depth of roadbed is 1.6 ~ 2. 4m. three kinds of subgrade soil with different plastic index are selected. The test design was carried out by using orthogonal table L1645.The static forming method was used to make the soil formed at the level of water content and compaction, and experienced different freeze-thaw cycles. The results show that the order of influencing factors for the same soil quality is as follows: moisture content freeze-thaw times compaction degree. 2) with the increase of moisture content, the strength of soil foundation decreases linearly. With the increase of freezing and thawing times, the soil foundation strength decreases gradually, the first two freeze-thaw times have a greater influence, and then the amplitude becomes smaller and more stable, and with the increase of compaction, the soil foundation strength increases gradually. The exponential function is used to fit the indoor test data of three kinds of soils, and the fitting results are good.
【作者单位】：吉林大学建设工程学院;吉林建筑大学交通科学与工程学院;
【基金】：国家自然科学基金项目(51308256) 吉林省交通运输科技计划项目(2011103)
【分类号】：U416.12

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