长江科学院院报 ›› 2016, Vol. 33 ›› Issue (1): 77-82.DOI: 10.11988/ckyyb.20140013

• 岩土工程 • 上一篇    下一篇

石灰改良膨胀土的水稳定性研究

边加敏1,2   

  1. 1.南京交通职业技术学院 江苏省道路交通节能减排技术研发中心,南京 211188;
    2.河海大学 岩土力学与堤坝工程教育部重点实验室,南京 210098
  • 收稿日期:2014-01-06 出版日期:2016-01-20 发布日期:2016-01-20
  • 作者简介:边加敏(1979-),男,江苏南京人,讲师,博士,主要从事非饱和土的教学与科研工作,(电话)15951670241(电子信箱) bianjiamin1114@aliyun.com。
  • 基金资助:
    国家自然科学基金重点项目(506390101);教育部博士点基金项目(20100094110002);南京交通职业技术学院课题(JY1402,JY1507)

Water Stability of Lime-treated Expansive Soil

BIAN Jia-min1,2   

  1. 1.Research Center of Energy Saving and Emission Reduction of Traffic Engineering Technology of Jiangsu Province, Nanjing Communications Institute of Technology, Nanjing 211188, China;
    2.Key Laboratory of Geomechanics and Embankment Engineering under Ministry of Education, Hohai University, Nanjing 210098, China
  • Received:2014-01-06 Online:2016-01-20 Published:2016-01-20

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摘要： 为研究石灰改良膨胀土的水稳定性,以某边坡弱膨胀土及石灰改良膨胀土为研究对象,进行了击实试验、无侧限抗压强度试验和压缩模量试验,并引用其他学者的相关土水特征曲线(SWCC)试验结果,分析了石灰改良膨胀土的水稳定特性。结果显示石灰改良膨胀土的可击实范围比素土宽,且最优含水率和最大干密度随掺灰率的增大分别线性增大和线性减小;石灰改良膨胀土经过1 d的吸湿后,无侧限抗压强度与压缩模量降低幅度最大,之后随着吸湿天数的增加,无侧限抗压强度和压缩模量降低的幅度逐渐减小,最终趋于稳定;经过1次干湿循环后,无侧限抗压强度降低幅度最大,之后随着干湿循环次数的增加,无侧限抗压强度降低幅度逐渐减小。试验后的石灰改良膨胀土强度及模量的衰减程度较素土有了较大幅度的降低,表明石灰改良土的水稳定性有了较大的改善。此外,SWCC的研究表明石灰改良膨胀土的水稳定性得到了较大幅度的提高。

关键词: 石灰改良膨胀土, 水稳定性, 无侧限抗压强度, 压缩模量, SWCC

Abstract: The water stability of lime-treated expansive soil is researched through compaction test, unconfined compression test and compression modulus test on weak expansive soil and lime-treated expansive soil in association with the test results of soil-water characteristic curve (SWCC) by other scholars. Results reveal that the compaction scope of lime-treated expansive soil is wider than that of natural expansive soil, and the optimum water content and the maximum dry density respectively increases and decreases linearly with the increment of lime content. The reduction of unconfined compressive strength and compression modulus of lime-treated expansive soil is the largest after one-day water absorption, and with the increase of water absorption time, the reduction rate gradually gets smaller and finally tends to be stable. Moreover, the reduction of unconfined compressive strength is up to maximum after 1 day’s wetting-drying cycle, and with the increasing of wetting-drying cycle, the reduction rate also decreases. The decreased margins of unconfined compressive strength and compression modulus of lime-treated expansive soil are remarkably smaller than that of natural expansive soil, indicating that the water stability of lime-treated expansive soil is greatly improved. In addition, researches of SWCC also show that the water stability of lime-treated expansive soil is improved.

Key words: lime-treated expansive soil, water stability, unconfined compressive strength, compression modulus, SWCC

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