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J4  2012, Vol. 46 Issue (3): 441-447    DOI: 10.3785/j.issn.1008-973X.2012.03.009
    
Study on properties of one-dimensional complex
nonlinear consolidation considering selfweight of saturated soils
HU An-feng1, HUANG Jie-qing1, XIE Xin-yu1, 2, WU Jian1, LI Jin-zhu1, LIU Kai-fu3
1. MOE Key Laboratory of Soft Soils and Geoenvironmental Engineering, Zhejiang University, Hangzhou 310058, China;
2. School of Civil Engineering and Architecture, Ningbo Institute of  Technology, Zhejiang University, Ningbo 315100, China;
3. School of Civil Engineering and Architecture, Zhejiang SciTech  University, Hangzhou 310018, China
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Abstract  

The nonlinear equations of permeability coefficient and effective stress were derived as functions of void ratio from compression test data of Ningbo soft clay. Based on one-dimensional nonlinear large strain consolidation equation using void ratio as a control variable, the effect of self-weight of soil on consolidation was taken into account. The behavior of self-weight consolidation is strongly nonlinear. It is difficult to find analytical solutions to its controlling equation. Partial differential finite element software FLEXPDE was used to solve the consolidation equation. Distributions of effective stress and excess pore water pressure with depth were presented under conditions of different ratios between compression index and permeability index. The numerical results considering complex nonlinearity of soil were in better agreement with the laboratory test data than those obtained under the assumptions for constant consolidation coefficient and other parameters during consolidation. If the compression-permeability index ratio is not equal to 1.0, the results using these two methods differ significantly. In this case, the nonlinearity of permeability and compressibility should be considered in order to understand the real distributions of effective stress and excess pore water pressure with depth during consolidation.



Published: 01 March 2012
CLC:  TU 443  
Cite this article:

HU An-feng, HUANG Jie-qing, XIE Xin-yu, WU Jian, LI Jin-zhu, LIU Kai-fu. Study on properties of one-dimensional complex
nonlinear consolidation considering selfweight of saturated soils. J4, 2012, 46(3): 441-447.

URL:

http://www.zjujournals.com/eng/10.3785/j.issn.1008-973X.2012.03.009     OR     http://www.zjujournals.com/eng/Y2012/V46/I3/441


考虑自重影响的饱和土体一维复杂非线性固结研究

根据宁波软土室内压缩试验数据,得到渗透系数及有效应力与孔隙比的非线性关系.考虑土体自重影响,采用以孔隙比为控制变量的一维大变形固结方程,应用偏微分有限元软件FLEXPDE,研究了不同压缩指数与渗透指数比值下土体有效应力和超静孔压在固结过程中沿深度的分布规律.试验结果和数值分析表明:考虑土体复杂非线性相对于假定固结系数及其他参数在固结过程中保持不变,计算结果更符合实际.在压缩指数与渗透指数比值不等于1的情况下,两种方法计算结果差别明显.为了真实反映土体固结过程中有效应力和超静孔压的分布,应考虑土体渗透性及压缩性的非线性变化.

[1] MIKASA M. The consolidation of soft clay—a new consolidation theory and its application[G]∥ Japanese Society of Civil Engineers.Civil Engineering in Japan,[S.l.]:[s.n.],1965: 21-26.
[2] GIBSON R E, ENGLAND G L, HUSSEY M J L. The theory of one dimensional consolidation of saturated clays, I. Finite non linear consolidation of thin homogeneous layers[J]. Geotechnique, 1967, 17(2): 261-273.
[3] POSKITT T J. Consolidation of saturated clay with variable permeability and compressibility[J]. Geotechnique, 1969, 19(2): 234-252.
[4] GIBSON R E, SCHIFFMAN R L, CARGILL K W. The theory of one dimensional consolidation of saturated clays, II. Finite non linear consolidation of thick homogeneous layers[J]. Canadian Geotechnical Journal, 1981, 18(2): 280-293.
[5] MESRI G, ROKHSAR A. Theory of consolidation for clays[J]. Journal of Geotechnical Engineering, ASCE, 1974, 100(GT4): 889-904.
[6] DUNCAN J M. Limitation of conventional Analysis of consolidation settlement[J]. Journal of Geotechnical Engineering, ASCE, 1993, 119(9): 1333-1359.
[7] 谢康和,郑辉,LEO C J. 变荷载下饱和软黏土一维大应变固结解析理论[J]. 水利学报,2003, 48(10): 6-13.
XIE KangHe, ZHENG Hui, LEO C J. Analytical solution for 1D large strain consolidation of saturated soft clay under timedepending loading[J]. Journal of Hydraulic Engineering, 2003,48 (10): 6-13.
[8] XIE Xinyu, ZHANG Jifa, ZENG Guoxi. Similarity solution of selfweight consolidation problem for saturated soil[J]. Applied Mathematics and Mechanics, 2005, 26(9): 1061-1066.
[9] CAI Yuanqiang, GENG Xueyu, XU Changjie. Solution of onedimensional finite strain consolidation of soil with variable compressibility under cyclic loadings \
[J\]. Computers and Geotechnics, 2007, 34(1): 31-40.
[10] SL2371999 土工试验规程[S]. 北京:中国水利水电出版社,1999.
SL2371999 Specification of soil test [S]. Beijing: China Water Power Press,1999.
[11] 谢康和,齐添,胡安峰,等. 基于GDS的黏土非线性渗透特性试验研究[J]. 岩土力学, 2008, 29(2): 420-424.
XIE Kanghe, QI Tian, HU Anfeng, et al. Experimental study on nonlinear permeability characteristics of Xiaoshan clay[J]. Rock and Soil Mechanics, 2008, 29(2): 420-424.
[12] 谢康和,周谨,董亚钦. 循环荷载作用下地基一维非线性固结解析解[J]. 岩石力学与工程学报, 2006, 25(1): 21-26.
XIE Kanghe, ZHOU Jin, DONG Yaqin. Analytical solution for onedimensional nonlinear consolidation of soil under cyclic loadings[J]. Chinese Journal of Rock Mechanics and Engineering, 2006, 25(1): 21-26.
[13] BERRY P L,WILKINSON W B. The radial consolidation of clay soils[J]. Geotechnique, 1969, 19(2): 253-284.

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