膨胀土土水特征曲线的覆土压力效应研究

doi:10.13722/j.cnki.jrme.2019.0895

Abstract
Figure/Table
References (0)
Related Citation (15)

Download: PDF (887 KB) HTML (1 KB)
Export: BibTeX | EndNote (RIS)

Abstract In order to investigate the stress state effect on water retention and deformation characteristics of expansive soil. Considering the overburden pressure，a soil-water characteristics curve(SWCC) model of expansive soil is carried out. Furthermore，the equation-fitting process of the proposed model under the different one-dimensional overburden pressure is analyzed. Results show that：(1) The moisture content in Nanyang expansive soil displays a regular change and bimodal characteristics wile matrix suction changes. With the increase of overburden pressure，the water-holding capacity of expansive soil decreases. The boundary effect II is significantly prolonged at 200 kPa overburden pressure. (2) The pore ratio of the soil decreases with the increase of overburden pressure and matric suction. The contribution of pore shrinkage caused by overburden pressure is 2.12 times as much as that caused by matric suction. Under the stress，the loss of void water caused by overburden pressure dominates volume shrinkage in the dehumidification process of expansive soil. (3) Based on the segmentation，the Fredlund-Xing equation is improved by using the proposed bimodal SWCC model to fit the data of Nanyang expansive soil. Fitting parameters a1 and n1 can effectively reflect the characteristic variation of SWCC1 under different overburden pressure. The influence of overburden pressure is weakened in the stage of SWCC2. The relationship between each parameter and overburden pressure is not obvious. The research gives references for the quantitative characterization of the hydraulic-mechanical coupling effect of expansive soil，as well as the study of bimodal characteristics SWCC models.

Key words： soil mechanics expansive soil bimodal soil-water characteristic curve overburden pressure effect consolidation yield stress model

	Service

	E-mail this article
	Add to my bookshelf
	Add to citation manager
	E-mail Alert
	RSS
	Articles by authors
	WANG Xiaoqi
	XU Chong
	WANG Shiji
	LI Xian

Cite this article:

WANG Xiaoqi,XU Chong,WANG Shiji, et al. Study on overburden pressure effect of expansive soil water characteristic curve[J]. , 2020, 39(S1): 3067-3075.

URL:

http://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2019.0895 OR http://rockmech.whrsm.ac.cn/EN/Y2020/V39/IS1/3067

[12]	ELKADY T Y，AHMED A M. Effect of vertical stress on the soil water characteristic curve of highly expansive soils[J]. Springer Berlin Heidelberg，2012：165–171.
[22]	SATYANAGA A，RAHARDJO H，LEONG E C，et al. Water characteristic curve of soil with bimodal grain-size distribution[J]. Computers and Geotechnics，2013，48：51–61.
[3]	夏金文，魏玉杰，蔡崇法. 花岗岩风化土物理特征曲线间的相关性研究[J]. 土壤学报，2017，54(3)：581–589.(XIA Jinwen，WEI Yujie，CAI Chongfa. Correlations between characteristic curves of physical properties of weathered granite soils[J]. Acta Pedologica Sinica，2017，54(3)：581–589.(in Chinese))
[11]	NG C W W，PANG Y. W. Influence of stress state on soil-water characteristics and slope stability[J]. Journal of Geotechnical and Geoenvironmental Engineering，2000，126(2)：157–166.
[23]	常东升，张利民. 土体渗透稳定性判定准则[J]. 岩土力学，2011，32(1)：253–259.(CHANG Dongsheng，ZHANG Limin. Internal stability criteria for soils[J]. Rock and Soil Mechanics，2011，32(1)：253–259.(in Chinese))
[1]	程展林，龚壁卫. 膨胀土边坡[M]. 北京：科学出版社，2015：23–27.(CHENG Zhanlin，GONG Biwei. Expansive soil slope[M]. Beijing：Science Press，2015：23–27.(in Chinese))
[28]	SMETTEM K R J，KIRKBY C. Measuring the hydraulic properties of a stable aggregated soil[J]. Journal of Hydrology，1990，117(1)：1–13.
[9]	BROOKS R H，COREY A T. Hydraulic properties of porous media[M]. Fort Collins，USA：Colorado State University，1964.
[13]	张昭，刘奉银，赵旭光，等. 考虑应力引起孔隙比变化的土水特征曲线模型[J]. 水利学报，2013，44(5)：578–585.(ZHANG Zhao，LIU Fengyin，ZHAO Xuguang，et al. A soil water characteristic curve model considering void ratio variation with stress[J]. Journal of Hydraulic Engineering，2013，44(5)：578–585.(in Chinese))
[30]	HONG Z S，ONITSUKA，KATSUTADA. A method of correcting yield stress and compression index of ariake clays for sample disturbance[J]. Soils and Foundations，2008，38(2)：211–222.
[15]	周葆春，张彦钧，汤致松，等. 不同压实度荆门弱膨胀土的一维膨胀–压缩特性[J]. 岩土力学，2014，35(5)：1 275–1 283.(ZHOU Baochun，ZHANG Yanjun，TANG Zhisong，et al. One-dimensional swelling-compression characteristics of Jingmen weak expansive soil under different compactnesses[J]. Rock and Soil Mechanics，2014，35(5)：1 275–1 283.(in Chinese))
[18]	豆红强，韩同春，龚晓南. 降雨条件下考虑裂隙土孔隙双峰特性对非饱和土边坡渗流场的影响[J]. 岩石力学与工程学报，2016，34(2)：4 373–4 379.(DOU Hongqiang，HAN Tongchun，GONG Xiaonan. Effects of bi-modal characteristics of fractured soil pore on seepage field of unsaturated soil slope[J]. Chinese Journal of Rock Mechanics and Engineering，2016，34(2)：4 373–4 379.(in Chinese))
[19]	中华人民共和国国家标准编写组. GB/T 50123－1999土工试验方法标准[S]. 北京：中国水利水电出版社，1999.(The National Standards Compilation Group of People?s Republic of China. GB/T 50123－1999 Standard for soil test method[S]. Beijing：China Water Power Press，1999.(in Chinese))
[21]	中华人民共和国国家标准编写组. GB50112－2013膨胀土地区建筑技术规范[S]. 北京：中国建筑工业出版社，2013.(The National Standards Compilation Group of People?s Republic of China. GB50112－2013 Technical code for buildings in expansive soil regions[S]. Beijing：China Building Industry Press，2013.(in Chinese))
[25]	陈波，孙德安，高游，等. 弱胶结结构性软黏土力学特性的试验研究[J]. 岩土工程学报，2017，39(12)：1–8.(CHEN Bo，SUN Dean，GAO You，et al. Experimental study on mechanical behavior of weakly structured soft clays[J]. Chinese Journal of Geotechnical Engineering，2017，39(12)：1–8.(in Chinese))
[29]	BUTTERFIELD R. A natural compression law for soils (an advance on e-log p?[J]. Geotechnique，1979，29(4)：469–480.
[4]	邓羽松，丁树文，蔡崇法，等. 鄂东南崩岗剖面土–水特征曲线及模拟[J]. 土壤学报，2016，53(2)：264–355.(DENG Yusong，DING Shuwen，CAI Chongfa，et al. Characteristic curves and model analysis of soil moisture in collapse mound profiles in southeast Hubei[J]. Acta Pedologica Sinica，2016，53(2)：264–355.(in Chinese))
[7]	VAN GENUCHTEN M T. A closed-form equation for predicting the hydraulic conductivity of unsaturated soils[J]. Soil Science Society of America Journal，1980，44(44)：892–898.
[14]	汪时机，程明书，李贤，等. 非饱和土双应力变量广义土–水特征曲线理论模型构建[J]. 农业工程学报，2017，33(6)：1–7.(WANG Shiji，CHENG Mingshu，LI Xian，et al. Establishment of generalized soil-water characteristic curve theoretical model considering two stress state variables for unsaturated soils[J]. Transactions of the Chinese Society of Agricultural Engineering，2017，33(6)：1–7.(in Chinese))
[17]	BURGER C A，SHACKELFORD C D. Evaluating dual porosity of pelletized diatomaceous earth using bimodal soil-water characteristic curve functions[J]. Canadian Geotechnical Journal，2001，38(1)：53–66.
[24]	张先伟，孔令伟，郭爱国，等. 不同固结压力下强结构性黏土孔隙分布试验研究[J]. 岩土力学，2014，35(10)：2 794–2 800.(ZHANG Xianwei，KONG Lingwei，GUO Aiguo，et al. Experiment study of pore distribution of strong structural clay under different consolidation pressures[J]. Rock and Soil Mechanics，2014，35(10)：2 794–2 800.(in Chinese))
[2]	李爱国，岳中琦，谭国焕，等. 野外土–水特征及其工程意义[J]. 岩石力学与工程学报，2004，23(6)：969–973.(LI Aiguo，YUE Zhongqi，TAN G H，et al. Field soil-water characteristics and its engineering implication[J]. Chinese Journal of Rock Mechanics and Engineering，2004，23(6)：969–973.(in Chinese))
[5]	程明书，李贤，汪时机，等. 非饱和土双应力变量广义土水特征曲线模型验证[J]. 农业工程学报，2017，33(6)：8–17.(CHENG Mingshu，LI Xian，WANG Shiji，et al. Model verification of generalized soil-water characteristic curve considering two stress state variables for unsaturated soils[J]. Transactions of the Chinese Society of Agricultural Engineering，2017，33(6)：8–17.(in Chinese))
[6]	黄海，陈正汉，李刚. 非饱和土在p-s平面上屈服轨迹及土–水特征曲线的探讨[J]. 岩土力学，2000，21(4)：316–321.(HUANG Hai，CHEN Zhenghan，LI Gang. A study on yield locus of unsaturated soils on p-s plane and soil-water characteristic curve[J]. Rock and Soil Mechanics，2000，21(4)：316–321.(in Chinese))
[8]	FREDLUND D G，XING A Q. Equations for the soil-water characteristic curve[J]. Canadian Geotechnical Journal，1994，31(4)：521–532.
[10]	VANAPALLI S K，FREDLUND D G，PUFAHL D E. The influence of soil structure and stress history on the soil–water characteristics of a compacted till[J]. Geotechnique，1999，49(2)：143–160.
[16]	ZHANG L M，ASCE M，CHEN Q. Predicting bimodal soil–water characteristic curves[J]. Journal of Geotechnical and Geoenvironmental Engineering，2005，131(5)：666–670.
[20]	中华人民共和国国家标准编写组. GB/T 50145－2007土的工程分类标准[S]. 北京：中国计划出版社，2008.(The National Standards Compilation Group of People?s Republic of China. GB/T 50145－2007 Standard for engineering classification of soil[S]. Beijing：China Planning Press，2008.(in Chinese))
[27]	沈珠江. 广义吸力和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 of Geotechnical Engineering，1996，18(2)：1–9.(in Chinese))
[26]	陈宇龙，黄栋. 不同应力状态下孔隙结构特征对土–水特征曲线的影响[J]. 工程科学学报，2017，39(1)：147–154.(CHEN Yulong，HUANG Dong. Influence of pore structure characteristics on soil-water characteristics curves under different stress states[J]. Chinese Journal of Engineering，2017，39(1)：147–154.(in Chinese))