吉林大学学报(地球科学版) ›› 2016, Vol. 46 ›› Issue (6): 1790-1798.doi: 10.13278/j.cnki.jjuese.201606202

• 地质工程与环境工程 • 上一篇    下一篇

非饱和土增湿变形的实用计算方法

刘兰兰1, 李鸿儒2, 常秋影1, 李晓乐1, 王洪宇1, 赵传海1   

  1. 1. 长春建筑学院土木工程学院, 长春 130607;
    2. 西安理工大学土木工程学院, 西安 710048
  • 收稿日期:2016-02-07 出版日期:2016-11-26 发布日期:2016-11-26
  • 作者简介:刘兰兰(1983),女,讲师,主要从事非饱和土力学性质的研究,E-mail:109666088@qq.com
  • 基金资助:
    国家自然科学基金项目（51479168）；吉林省教育厅重点科研项目（吉教科字[2016]第539号）

Practical Computation Method of Deformation with Water Content Increasing of Unsaturated Soil

Liu Lanlan1, Li Hongru2, Chang Qiuying1, Li Xiaole1, Wang Hongyu1, Zhao Chuanhai1   

  1. 1. School of Civil Engineering, Changchun Architecture & Civil Engineering College, Changchun 130607, China;
    2. School of Civil Engineering and Architecture, Xi'an University of Technology, Xi'an 710048, China
  • Received:2016-02-07 Online:2016-11-26 Published:2016-11-26
  • Supported by:
    Supported by National Natural Science Foundation of China(51479168)and Key Research Project of Jilin Provincial Department of Education ([2016] No.539)

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摘要： 非饱和土力学研究目前还未进入实用阶段，主要原因在于吸力量测困难。本文提出了用等效吸力代替真实吸力的试验方法。首先以常规静三轴试验得到的原状饱和土以及非饱和土的应力-应变曲线为基础，根据变形等效的原则确定与某一饱和度相当的围压即为等效吸力；然后建立饱和度与等效吸力之间的非线性关系，并验证了该数学公式的正确性；再根据试验结果分析含水量对非饱和土强度的影响，建立了非饱和土的实用抗剪强度公式；最后按照邓肯-张模型的参数整理方法得到了不同饱和度非饱和土的模型参数，探索这些参数随饱和度的变化规律，建立了引入饱和度的非饱和黄土实用非线性模型，并进行了降雨入渗情况下非饱和土增湿变形的计算。结果表明，饱和度最大值为95%，等效吸力最大值为160 kPa，最大水平位移与竖向位移分别为0.6 cm和20.0 cm，均出现在浸水位置。计算结果合理地反映了非饱和土变形的分布趋势，验证了方法的合理性。

关键词: 非饱和土, 等效吸力, 三轴试验, 变形等效, 强度

Abstract: The research of unsaturated soil mechanics cannot yet reach in practical application because of the difficulty in measuring suction. A new test method to measure suction is suggested in this paper, in which the actual suction is replaced by equivalent suction. The cell pressure in a certain degree of saturation is taken as the equivalent suction according to the principle of deformation equivalence and the stress-strain curves obtained by triaxial compression tests of saturated and unsaturated undisturbed soil. A nonlinear relationship formula between equivalent suction and degree of saturation is presented. Then, considering the influences of water contents on strength, a non-linear shear strength model and stress-strain model of unsaturated loess are developed. And the parameters of Dancun-Chang's model are obtained for unsaturated soils with different saturation degree. The deformation from presented model under the case of rain-seepage into unsaturated soil show that the maximum of suction and displacement occurs in place in flooding, in which the maximum degree of saturation is 95%, the maximum equivalent suction is 160 kPa, the maximum horizontal displacement and vertical displacement are 0.6 cm and 20.0 cm, respectively. The calculation results rationally reflect the distribution trend of unsaturated soil deformation.

Key words: unsaturated soils, equivalent suction, triaxial compression tests, equivalence of deformation, strength

中图分类号: 

  • P642.116
[1] 陈正汉.非饱和土与特殊土力学的基本理论研究[J].岩土工程学报,2014,36(2):201-272. Chen Zhenghan. On Basic Theories of Unsaturated Soils and Special Soils[J]. Chinese Journal Geotechnical Engineering,2014,36(2):201-272.
[2] 沈珠江,孙大伟. 超固结土变形和稳定的折减吸力算法[J].岩土工程学报,2005,27(1):105-109. Shen Zhujiang, Sun Dawei. Deformation and Stability Analysis of Over-Consolidated Soils Based on Reduced Suction Concept[J]. Chinese Journal Geotechnical Engineering,2005,27(1):105-109.
[3] 沈珠江.非饱和土简化固结理论及其应用[J].水利水运工程学报,2003(4):1-6. Shen Zhujiang. Simplified Consolidation Theory for Unsaturated Soils and Its Application Hydro-Science and Engineering[J]. Hydro-Science and Engineering,2003(4):1-6.
[4] 沈珠江.非饱和土力学实用化之路探索[J].岩土工程学报,2006,28(2):256-259. Shen Zhujiang. Exploitation of Practical Use of Unsaturated Soil Mechanics[J]. Chinese Journal Geotechnical Engineering,2006,28(2):256-259.
[5] 陈辉,韦昌富,陈芳芳,等.非饱和土土-水特征曲线预估方法研究[J].岩土力学,2013,34(1):123-128. Chen Hui, Wei Changfu, Chen Fangfang, et al. Research on Prediction Method of Soil-Water Characteristic Curve of Unsaturated Soils[J]. Rock and Soil Mechanics, 2013, 34(1): 123-128.
[6] 朱青青,苗强强,陈正汉,等.考虑基质势影响的非饱和土水分运移规律测试系统研制[J].岩土力学,2016,38(增刊2):240-244. Zhu Qingqing, Miao Qiangqiang, Chen Zhenghan, et al. Development of Test System for Unsaturated Soil Water Movement Law Considering Influence of Matrix Potential[J]. Chinese Journal of Geotechnical Engineering, 2016,38(Sup.2):240-244.
[7] 赵成刚,李舰,刘艳,等.非饱和土力学中几个基本问题的探讨[J]. 岩土力学,2013,34(7):1825-1831. Zhao Chenggang, Li Jian, Liu Yan, et al. Discussion on some Fundamental Problems in Unsaturated Soil Mechanics[J]. Rock and Soil Mechanics,2013,34(7):1825-1831.
[8] 陈正汉,秦冰.非饱和土的应力状态变量研究[J].岩土力学,2012,33(1):1-11. Chen Zhenghan, Qin Bing. on Stress State Variables of Unsaturated Soils[J]. Rock and Soil Mechanics,2012,33(1):1-11.
[9] 弗雷德隆德D G,拉哈尔佐H. 非饱和土土力学[M]. 陈仲颐译. 北京:中国建筑工业出版社,1997. Fredlund D G,Lahars H. Unsaturated Soil Mechanics[M]. Translated by Chen Zhongyi. Beijing:China Architecture and Building Press,1997.
[10] 陈剑平,陈鑫,王清,等. 大连大窑湾区吹填淤泥土三轴剪切试验[J].吉林大学学报(地球科学版),2012,42(增刊3): 226-231. Chen Jianping, Chen Xin, Wang Qing, et al. Triaxial Shear Tests of Dredger Fill Sludge in Dayaowan Area of Dalian[J]. Journal of Jinlin University(Earth Science Edition), 2012,42(Sup.3):240-244.
[11] 沈珠江.广义吸力非饱和土的统一变形理论[J].岩土工程学报,1996,18(2):1-9. Shen Zhujiang. Generalized Suction and Unified Deformation Theory for Unsaturated Soils[J].Chinese Journal Geotechnical Engineering,1996,18(2):1-9.
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