Experimental Study of Weathered Sand on Mechanic Index of Modified Expansive Soil

doi:10.3969 /j.issn.1674-0696.2014.01.15

Journal of Chongqing Jiaotong University(Natural Science) ›› 2014, Vol. 33 ›› Issue (1): 64-69.DOI: 10.3969 /j.issn.1674-0696.2014.01.15

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Experimental Study of Weathered Sand on Mechanic Index of Modified Expansive Soil

Yang Jun^1,2，Tong Lei^1,2，Zhang Guodong^1,2，Tang Yunwei³，Liang Yong⁴

1. Collaborative Innovation Center of Geological Hazards ＆ Ecological Environment in Three Gorges Area in Hubei Province， Three Gorges University，Yichang 443002，Hubei，China; 2. School of Civil Engineering ＆ Architecture，Three Gorges University，Yichang 443002，Hubei，China; 3. Yichang Traffic ＆ Transportation Bureau，Yichang 443002，Hubei，China; 4. Xiaoxita-Yaqueling First-Class Highway Ｒebuilding Engineering Project，Yichang 443002，Hubei，China

Received:2012-08-09 Revised:2013-07-01 Online:2014-02-15 Published:2015-01-22

风化砂改良膨胀土力学指标试验研究

杨俊^1,2，童磊^1,2，张国栋^1,2，唐云伟³，梁勇⁴

1. 三峡大学三峡地区地质灾害与生态环境湖北省协同创新中心，湖北宜昌443002; 2. 三峡大学土木与建筑学院，湖北宜昌443002; 3. 宜昌市交通运输局，湖北宜昌443002; 4. 小鸦一级公路改建工程项目部，湖北宜昌443002

作者简介:杨俊(1976—) ，男，湖北武汉人，副教授，博士，主要从事道路与桥梁工程方面的研究。E － mail: wangjing750301@163． com。
基金资助:
湖北省教育厅自然科学研究重点项目( D20131304)

Abstract

Abstract: California Bearing Ratio ( CBR) laboratory test，resilient modulus test and shear strength test were conducted to analyze the influence of initial water content and sand ratio on the properties of expansive soil． It is indicates that in the same sand mixing ratio，CBＲ value increases with the increasing of mixing ratio． And the amplification of CBR value has a largest increase when the sand ratio changes from 30% to 40%． The sticky poly force decreases with the increasing of sand mixing ratio． The interior friction angle and the resilient modulus increases and then decreases when the sand mixing ratio increases． When the sand mixing ratio is over 10%，the resilient modulus rapidly decreases． Based on the influence of various strength indexes，the initial water content and the sand mixing ratio is suggested to adjust according to the actual engineering in the subgrade design and construction．

Key words: expansive soil, weathered sand, California Bearing Ratio ( CBR) , resilient modulus, shear strength

摘要： 通过室内加州承载比( CBＲ) 、回弹模量及抗剪强度试验，研究了初始含水率、掺砂比对改良膨胀土性能的影响。研究表明: 在同一掺砂比下，CBＲ值、回弹模量和抗剪强度指标均随着初始含水率的提高先增加后减小; 当初始含水率相同时，CBＲ值随着掺砂比的增大逐渐增加，当掺砂比由30% 提高至40% 时，CBＲ值增幅最大; 黏聚力随着掺砂比的增加逐渐减小; 内摩擦角随着掺砂比的增大先增加后减小; 回弹模量随着掺砂比的增大先增加后减小，掺砂比超过10%后回弹模量迅速降低。在进行路基设计与施工时，须根据工程实际情况，综合考虑各强度指标间的影响，适当的调整初始含水率与掺砂比，以到达最佳的改良效果。

关键词: 膨胀土, 风化砂, CBＲ, 回弹模量, 抗剪强度

CLC Number:

TU411.3

Yang Jun，Tong Lei，Zhang Guodong，Tang Yunwei，Liang Yong. Experimental Study of Weathered Sand on Mechanic Index of Modified Expansive Soil[J]. Journal of Chongqing Jiaotong University(Natural Science), 2014, 33(1): 64-69.

杨俊，童磊，张国栋，唐云伟，梁勇. 风化砂改良膨胀土力学指标试验研究[J]. 重庆交通大学学报（自然科学版）, 2014, 33(1): 64-69.

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Experimental Study of Weathered Sand on Mechanic Index of Modified Expansive Soil

风化砂改良膨胀土力学指标试验研究

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