Structural Strength Deterioration Characteristics and a Model of Undisturbed Loess under the Action of Wetting and Freeze-Thaw Cycles

被引:12
作者
She, Haicheng [1 ,2 ,3 ]
Hu, Zaiqiang [1 ]
Qu, Zhan [4 ]
Li, Hongru [1 ]
Guo, Hu [5 ,6 ]
Ma, Xiaoli [3 ]
机构
[1] Xian Univ Technol, Inst Geotech Engn, Xian 710048, Peoples R China
[2] Minist Water Resource, Key Lab Failure Mech & Safety Control Tech Earth, Nanjing 210024, Peoples R China
[3] Yulin Univ, YuLin Key Lab Special Soil Mech & Engn, Yulin 719000, Peoples R China
[4] Xian Shiyou Univ, Coll Petr Engn, Xian 710065, Peoples R China
[5] Yanan Univ, Sch Petr Engn & Environm Engn, Yanan 716000, Peoples R China
[6] China Univ Petr, State Key Lab Petr Resources & Prospecting, Beijing 102249, Peoples R China
基金
中国国家自然科学基金;
关键词
CONSTITUTIVE MODEL; LAND SUBSIDENCE; REMOLDED LOESS; DAMAGE; SOIL; LANDSLIDES; STRESS; CHINA; CLAY; DISTRIBUTIONS;
D O I
10.1155/2019/4790250
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Undisturbed loess is affected by external environmental disturbances, such as wetting and freeze-thaw cycles, which cause microstructural changes that have an important impact on the structural strength of the loess. These changes in turn affect the stability of structures such as embankments, slopes, and guards. This article takes the Q(3) undisturbed loess in Lintong District, Xi'an, as an example. The effects of wetting and freeze-thaw cycles on the loess expansion ratio and pore structure were studied by wetting tests, freeze-thaw cycle tests, and scanning electron microscopy (SEM). The changes in the compression index and compression modulus were studied by a confined compression test. The loess e-lgp compression curve was obtained according to the confined compression test, and the newly defined concepts of the loess structural strength, residual structural strength, and structural strength damage variable, in addition to the e-lgp compression curve, were combined with the experimental data to calculate the damage value generated by the disturbance during the sampling and preparation of loess. The deterioration of the structural strength and damage variable of loess was analyzed. Based on the microscopic statistical damage theory and Weibull distribution, the model used the volume expansion ratio as a variable to establish a statistical damage model under wetting and freeze-thaw cycles. Finally, on the basis of the test, the model parameters were determined. The models were verified by taking loess from a foundation pit in the northern suburbs of Xi'an and were in good agreement with the results of the test. Ultimately, the models have good practicability and can provide guidance for engineering design and construction.
引用
收藏
页数:23
相关论文
共 64 条
  • [1] [Anonymous], 1999, Chin J Geotech Eng
  • [2] Land subsidence induced by groundwater pumping, monitored by D-InSAR and field data in the Toluca Valley, Mexico
    Calderhead, A. I.
    Martel, R.
    Alasset, P. -J.
    Rivera, A.
    Garfias, J.
    [J]. CANADIAN JOURNAL OF REMOTE SENSING, 2010, 36 (01) : 9 - 23
  • [3] Casagrande A., 1932, Boston Society Civil Engineers Journal, V19, P168
  • [4] EFFECT OF FREEZING AND THAWING ON THE PERMEABILITY AND STRUCTURE OF SOILS
    CHAMBERLAIN, EJ
    GOW, AJ
    [J]. ENGINEERING GEOLOGY, 1979, 13 (1-4) : 73 - 92
  • [5] [陈正汉 CHEN Zhenghan], 2009, [岩土力学, Rock and Soil Mechanics], V30, P1
  • [6] FORM AND FUNCTION OF MICROFABRIC FEATURES IN A VARIETY OF NATURAL SOILS
    COLLINS, K
    MCGOWN, A
    [J]. GEOTECHNIQUE, 1974, 24 (02): : 223 - 254
  • [7] Landslide risk assessment and management: an overview
    Dai, FC
    Lee, CF
    Ngai, YY
    [J]. ENGINEERING GEOLOGY, 2002, 64 (01) : 65 - 87
  • [8] Dang JQ, 1998, J HYDRAULIC ENG, V9, P15
  • [9] On a statistical damage constitutive model for rock materials
    Deng, Jian
    Cu, Desheng
    [J]. COMPUTERS & GEOSCIENCES, 2011, 37 (02) : 122 - 128
  • [10] GEOLOGICAL AND GEOTECHNICAL CHARACTERISTICS OF SOME LOESS AND LOESSIC SOILS FROM CHINA AND BRITAIN - A COMPARISON
    DERBYSHIRE, E
    MELLORS, TW
    [J]. ENGINEERING GEOLOGY, 1988, 25 (2-4) : 135 - 175