长江科学院院报 ›› 2016, Vol. 33 ›› Issue (6): 79-82.DOI: 10.11988/ckyyb.20150170

• 岩土工程 • 上一篇    下一篇

三峡库区某滑坡土非饱和松弛特性 试验研究及模型建立

刘佳龙1,2,王世梅1,2,胡秋芬1,2,郭振2   

  1. 1. 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
  • 收稿日期:2015-03-10 出版日期:2016-05-25 发布日期:2016-06-12
  • 作者简介:刘佳龙(1990-),男,湖北孝感人,硕士研究生,主要从事岩土体稳定性方面的研究,(电话)18871730681(电子信箱)190222591@qq.com。    通讯作者:王世梅(1965-),女,湖北宜昌人,教授,博士生导师,主要从事非饱和土流变特性研究,(电话)13972598072(电子信箱)284480957@qq.com。
  • 基金资助:
    国家自然科学基金项目(41372359)

Study on Unsaturated Relaxation Properties of Soils of a Landslide in the Three Gorges Reservoir Area and Model Construction

LIU Jia-long1,2, WANG Shi-mei1,2, HU Qiu-fen1,2, GUO Zhen2   

  1. 1.Collaborative Innovation Center for Geo-hazards and Eco-environment in Three Gorges Area, Yichang443002, China;
    2.College of Civil Engineering & Architecture, China Three Gorges University,Yichang 443002, China
  • Received:2015-03-10 Published:2016-05-25 Online:2016-06-12

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摘要： 为了解基质吸力对非饱和土松驰特性的影响,利用GDS非饱和三轴仪的高级加载模块对三峡库区某滑坡土样开展了不同基质吸力的非饱和松弛试验,选取了与试验松弛曲线较一致的指数函数、对数函数、幂函数分别进行了曲线拟合,在对3种拟合结果进行对比分析基础上,确定了拟合精度最高的幂函数作为松弛模型,并分别求出了不同基质吸力作用下松弛曲线的模型参数。同时分析了各模型参数与基质吸力之间的相关性,并建立了模型参数与基质吸力之间的关系函数,据此建立了能反映基质吸力影响的非饱和土松弛模型。

关键词: 滑坡, 非饱和土, 基质吸力, 松弛模型, 松驰特性

Abstract: In order to obtain influence of matric suction on relaxation properties of unsaturated soil, we conduct stress relaxation tests of unsaturated soil of a landslide in Three Gorges Reservoir area by using GDS triaxial apparatus. Exponential function, logarithmic function and power function are selected for curve fitting. Through comparative analysis, power function is selected as the relaxation model as it has maximum fitting accuracy, and the model parameters under different matric suctions are obtained. The correlations between matric suctions and model parameters are analyzed, and function relationships are built. The function relationships are substituted into the relaxation model equation and a relaxation model that can reflect the effect of matric suction of unsaturated soil is obtained.

Key words: landslide, unsaturated soil, matric suction, relaxation model, relaxation properties

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