侧限条件下增湿时湿陷性黄土的变形及持水特性

doi:10.13722/j.cnki.jrme.2015.0300

摘要
图/表
参考文献
相关文章 (15)

全文: PDF (284 KB) HTML (1 KB)
输出: BibTeX | EndNote (RIS)

摘要用改装的非饱和土直剪仪在无应力及净竖向应力作用下对湿陷性黄土进行分级增湿试验，测量增湿过程中变形及吸力的变化，分析增湿前孔隙比(无应力时)及净竖向应力对增湿时湿陷性黄土的变形及持水特性的影响，探讨无应力与净竖向应力作用时增湿持水特性之间的关系，提出力水耦合作用下孔隙比与吸力关系的表达式及以饱和度与吸力关系表征的持水特性模型。研究结果表明：力水耦合作用下，孔隙比与归一化吸力关系可用对数函数来描述，可以用孔隙比的变化来反映净竖向应力对持水特性的影响。无应力及净竖向应力作用时，只要孔隙比相同，则饱和度与吸力间关系相同。吸力小于阈值时，增湿前孔隙比和力水耦合作用所致孔隙比的变化对含水率与吸力间关系皆有较大影响；大于阈值时，几乎没有影响，且可用同一幂函数描述，据此提出考虑孔隙比变化的修正V-G模型，该模型可以预测无应力及净竖向应力作用时湿陷性黄土的增湿持水特性，预测结果与试验结果吻合较好。

	服务

	把本文推荐给朋友
	加入我的书架
	加入引用管理器
	E-mail Alert
	RSS
	作者相关文章

关键词 ：土力学, 湿陷性黄土, 增湿, 变形, 持水特性, 力水耦合

Abstract：Stepped wetting tests were performed on collapsible loess under null stress and net vertical stress by using refitted direct shear apparatus for unsaturated soils. The variation of deformation and suction were measured during wetting. The influences of void ratio at the beginning of wetting(null stress) and net vertical stress on deformation and water retention behaviour of collapsible loess were analyzed during wetting. The wetting water retention behaviour under null stress was compared with that under net vertical stress. The models describing the relation of void ratio versus the suction and the water retention behaviour on the degree of saturation versus the suction were proposed under hydro-mechanical coupling. Having considered hydro-mechanical coupling，the relationship of void ratio and normalized suction was described by a logarithmic function and the influence of net vertical stresses on the water retention behaviour was reflected by the variation of void ratio. The relationship of the suction and degree of saturation under hydro-mechanical coupling was the same as that under null stress for the same void ratio. When the suction was less than a certain threshold value，the variations of the void ratio either at the beginning of wetting or induced by hydro-mechanical coupling had great influence on the relationship of suction and water content. A modified V-G model considering the variations of the void ratio was put forward. The model described the wetting water retention behaviour under null stress and net vertical stresses. The predicted results were in good agreement with the test results.

Key words： soil mechanics collapsible loess wetting deformation water retention behaviour hydro-mechanical coupling

引用本文:

张登飞1，2，陈存礼1，2，杨炯1，王俊甫1，张文博1. 侧限条件下增湿时湿陷性黄土的变形及持水特性[J]. 岩石力学与工程学报, 2016, 35(3): 604-612.
ZHANG Dengfei1，2，CHEN Cunli1，2，YANG Jiong1，WANG Junfu1，ZHANG Wenbo1. Deformation and water retention behaviour of collapsible loess during wetting under lateral confinement. , 2016, 35(3): 604-612.

链接本文:

http://www.rockmech.org/CN/10.13722/j.cnki.jrme.2015.0300 或 http://www.rockmech.org/CN/Y2016/V35/I3/604

[20]	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(5)：892–898. " target="_blank">
[23]	ALONSO E E，GENS A，JOSA A. A constitutive model for partially soils[J]. Geotechnique，1990，40(3)：405–430. " target="_blank">
[24]	姚仰平，牛雷，韩黎明，等. 超固结非饱和土的试验研究[J]. 岩土力学，2011，32(6)：1 601–1 605.(YAO Yangping，NIU Lei，HAN Liming，et al. Experimental study of behaviors of over consolidated unsaturated clays[J]. Rock and Soil Mechanics，2011，32(6)：1 601–1 605.(in Chinese)) " target="_blank">
[1]	陈正汉，刘祖典. 黄土的湿陷变形机制[J]. 岩土工程学报，1986，8(2)：1–12.(CHEN Zhenghan，LIU Zudian. Mechanism of collapsible deformation of loess[J]. Chinese Journal of Geotechnical Engineering，1986，8(2)：1–12.(in Chinese))
[3]	张茂花，谢永利，刘保健. 增(减)湿时黄土的湿陷系数曲线特征[J].岩土力学，2005，26(9)：1 363–1 368.(ZHANG Maohua，XIE Yongli，LIU Baojian. Characteristics of collapsibility coefficient curves of loess during moistening and demoistening process[J]. Rock and Soil Mechanics，2005，26(9)：1 363–1 368.(in Chinese)) " target="_blank">
[4]	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 of Geotechnical Engineering，2014，36(2)：201–272.(in Chinese))
[5]	李加贵，陈正汉，黄雪峰. 原状Q3黄土湿陷特性的CT–三轴试验[J]. 岩石力学与工程学报，2010，29(6)：1 288–1 296.(LI Jiagui，CHEN Zhenghan，HUANG Xuefeng. CT-triaxial test for collapsibility of undisturbed Q3 loess[J]. Chinese Journal of Rock Mechanics and Engineering，2010，29(6)：1 288–1 296.(in Chinese)) " target="_blank">
[7]	刘保健，谢定义，郭增玉. 黄土地基增湿变形的实用算法[J]. 岩土力学，2004，25(2)：270–274.(LIU Baojian，XIE Dingyi，GUO Zengyu. A practical method for moistening deformation of loess foundation[J]. Rock and Soil Mechanics，2004，25(2)：270–274.(in Chinese)) " target="_blank">
[8]	陈存礼，高鹏，胡再强. 黄土的增湿变形特性及其与结构性的关系[J]. 岩石力学与工程学报，2006，25(7)：1 352–1 360.(CHEN Cunli，GAO Peng，HU Zaiqiang. Moistening deformation characteristic of loess and its relation to structure[J]. Chinese Journal of Rock Mechanics and Engineering，2006，25(7)：1 352–1 360.(in Chinese)) " target="_blank">
[2]	朱元青，陈正汉. 原状Q3黄土在加载和湿陷过程中细观结构动态演化的CT–三轴试验研究[J]. 岩土工程学报，2009，31(8)：1 219–1 228.(ZHU Yuanqing，CHEN Zhenghan. Experimental study on dynamic evolution of meso-structure of intact Q3 loess during loading and collapse using CT and triaxial apparatus[J]. Chinese Journal of Geotechnical Engineering，2009，31(8)：1 219–1 228.(in Chinese)) " target="_blank">
[6]	张苏民，郑建国. 湿陷性黄土(Q3)的增湿变形特征[J]. 岩土工程学报，1990，12(4)：21–31.(ZHANG Sumin，ZHENG Jianguo. The deformation characteristics of collapsible loess during moistening process[J]. Chinese Journal of Geotechnical Engineering，1990，12(4)：21–31.(in Chinese))
[10]	郭敏霞，张少宏，邢义川. 非饱和原状黄土湿陷变形及孔隙压力特性[J]. 岩石力学与工程学报，2000，19(6)：785–788.(GUO Minxia，ZHANG Shaohong，XING Yichuan. Collapse deformation and pore pressure characteristics of unsaturated intact loess[J]. Chinese Journal of Rock Mechanics and Engineering，2000，19(6)：785–788.(in Chinese))
[11]	王铁行，卢靖，岳彩坤. 考虑温度和密度影响的非饱和黄土土–水特征曲线研究[J]. 岩土力学，2008，29(1)：1–6.(WANG Tiehang，LU Jing，YUE Caikun. Soil-water characteristic curve for unsaturated loess considering temperature and density effect[J]. Rock and Soil Mechanics，2008，29(1)：1–6.(in Chinese)) " target="_blank">
[12]	刘奉银，张昭，周冬，等. 密度和干湿循环对黄土土–水特征曲线的影响[J]. 岩土力学，2011，32(增2)：132–137.(LIU Fengyin，ZHANG Zhao，ZHOU Dong，et al. Effects of initial density and drying-wetting cycle on soil water characteristic curve of unsaturated loess[J]. Rock and Soil Mechanics，2011，32(Supp.2)：132–137.(in Chinese)) " target="_blank">
[14]	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)) " target="_blank">
[15]	李永乐，刘汉东，刘海宁，等. 黄河大堤非饱和土土水特性试验研究[J]. 岩土力学，2005，26(3)：347–350.(LI Yongle，LIU Handong，LIU Haining，et al. Test and study on soil water curve of unsaturated soil of Yellow River dyke[J]. Rock and Soil Mechanics，2005，26(3)：347–350.(in Chinese)) " target="_blank">
[16]	陈存礼，褚峰，李雷雷，等. 侧限压缩条件下非饱和原状黄土的土水特征[J]. 岩石力学与工程学报，2011，30(3)：610–615.(CHEN Cunli，CHU Feng，LI Leilei，et al. Soil-water characteristics of unsaturated undisturbed loess under confined compression condition[J]. Chinese Journal of Rock Mechanics and Engineering，2011，30(3)：610–615.(in Chinese))
[18]	张苏民，郑建国. 力和水作用先后次序对湿陷性黄土力学性状的影响[J]. 勘察科学技术，1990，(3)：10–14.(ZHANG Sumin，ZHENG Jianguo. The effect of the sequence of load application and water on mechanics characteristics of collapsible loess[J]. Site Investigation Science and Technology，1990，(3)：10–14.(in Chinese)) " target="_blank">
[9]	邢义川，李京爽，李振. 湿陷性黄土与膨胀土的分级增湿变形特性试验研究[J]. 水利学报，2007，38(5)：546–551.(XING Yichuan， LI Jingshuang，LI Zhen. Deformation characteristics of collapsible loess and expansive soil under the condition of wetted in stages[J] Journal of Hydraulic Engineering，2007，38(5)：546–551.(in Chinese)) " target="_blank">
[19]	PEREIRA H F J，FREDLUND D G. Volume change behavior of collapsible compacted gneiss soil[J]. Journal of Geotechnical and Geoenvironmental Engineering，ASCE，2000，126(10)：907–916. " target="_blank">
[21]	TARANTINO A. A water retention model for deformable soils[J]. Géotechnique，2009，59(9)：751–762. " target="_blank">
[22]	ROMERO E，GENS A，LLORET A. Water permeability，water retention and microstructure of unsaturated compacted Boom clay[J]. Engineering Geology，1999，54(1/2)：117–127. " target="_blank">
[13]	陈正汉. 重塑非饱和黄土的变形、强度、屈服和水量变化特性[J]. 岩土工程学报，1999，21(1)：82–90.(CHEN Zhenghan. Deformation，strength，yield and moisture change of a remolded unsaturated loess[J]. Chinese Journal of Geotechnical Engineering，1999，21(1)：82–90.(in Chinese)) " target="_blank">
[17]	陈正汉，扈胜霞，孙树国，等. 非饱和土固结仪和直剪仪的研制及应用[J]. 岩土工程学报，2004，26(2)：161–166.(CHEN Zhenghan，HU Shengxia，SUN Shuguo，et al. Development and application of consolidation apparatus and direct shear apparatus for unsaturated soils[J]. Chinese Journal of Geotechnical Engineering，2004，26(2)：161–166.(in Chinese))