Mechanical behavior of unsaturated intact loess over a wide suction range

SUN De-an; XU Qian-lei; CHEN Bo; ZHANG Zhou

doi:10.11779/CJGE202009002

Volume 42 Issue 9

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Chinese Journal of Geotechnical Engineering > 2020 > 42(9): 1586-1592. > DOI: 10.11779/CJGE202009002

SUN De-an, XU Qian-lei, CHEN Bo, ZHANG Zhou. Mechanical behavior of unsaturated intact loess over a wide suction range[J]. Chinese Journal of Geotechnical Engineering, 2020, 42(9): 1586-1592. DOI: 10.11779/CJGE202009002

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Mechanical behavior of unsaturated intact loess over a wide suction range

1.
Department of Civil Engineering, Shanghai University, Shanghai 200444, China
2.
College of Civil Engineering and Architecture, Quzhou University, Quzhou 324000, China

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Received Date: November 24, 2019
Available Online: December 07, 2022

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Abstract

A series of triaxial shear tests with controlled suction are performed on Q₃ unsaturated intact loess under constant net confining pressure to study the mechanical behavior of unsaturated intact loess over a wild suction range, and the suction is imposed using the axis translation technique and vapor equilibrium technique with saturated salt solution. The influences of the suction and net confining pressure on the strength and deformation characteristics of intact loess are analyzed. The test results show that the deviator stress of intact loess at failure increases with the suction under the same net confining pressure. The intact loess show different degrees of strain hardening or strain softening during the shear process under different suctions. The suction and net confining pressure have obvious influences on the shear dilatancy of intact loess, and a lower suction or higher net confining pressure results in a smaller shear-dilation. The cohesion of strength parameter of the intact loess increases obviously with the suction, while the internal friction angle does not change obviously in low suction range, but increases with the suction in high suction range.
- unsaturated intact loess,
- wide suction range,
- mechanical behavior,
- triaxial shear test,
- net confining pressure

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[1]	FREDLUND D G, RAHARDJO H. Soil Mechanics for Unsaturated Soils[M]. New York: John Wiley & Sons, Inc., 1993.
[2]	陈宗基. 中国西北黄土的基本性质及其工程建议[J]. 岩土工程学报, 1989, 11(6): 9-24. doi: 10.3321/j.issn:1000-4548.1989.06.002 CHEN Zong-ji. Fundamental properties of loess from Northwestern China[J]. Chinese Journal of Geotechnical Engineering, 1989, 11(6): 9-24. (in Chinese) doi: 10.3321/j.issn:1000-4548.1989.06.002
[3]	邵生俊, 周飞飞, 龙吉勇. 原状黄土结构性及其定量化参数研究[J]. 岩土工程学报, 2004, 26(4): 531-536. doi: 10.3321/j.issn:1000-4548.2004.04.021 SHAO Sheng-jun, ZHOU Fei-fei, LONG Ji-yong. Structural properties of loess and its quantitative parameter[J]. Chinese Journal of Geotechnical Engineering, 2004, 26(4): 531-536. (in Chinese) doi: 10.3321/j.issn:1000-4548.2004.04.021
[4]	陈伟, 骆亚生, 郭靖. 基于三轴剪切试验的原状黄土结构性研究[J]. 中国农村水利水电, 2012(7): 110-114. https://www.cnki.com.cn/Article/CJFDTOTAL-ZNSD201207031.htm CHEN Wei, LUO Ya-sheng, GUO Jing. The intact loess structural research based on the conventional triaxial compression test[J]. China Rural Water and Hydropower, 2012(7): 110-114. (in Chinese) https://www.cnki.com.cn/Article/CJFDTOTAL-ZNSD201207031.htm
[5]	段钊, 彭建兵, 冷艳秋. 泾阳南塬Q₂黄土物理力学特性[J]. 长安大学学报(自然科学版), 2016, 36(5): 60-66, 109. doi: 10.3969/j.issn.1671-8879.2016.05.009 DUAN Zhao, PENG Jian-bing, LENG Yan-qiu. Physico-mechanical characteristics of Q₂ loess in South Plateau of Jingyang[J]. Journal of Chang'an University (Natural Science Edition), 2016, 36(5): 60-66, 109. (in Chinese) doi: 10.3969/j.issn.1671-8879.2016.05.009
[6]	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. doi: 10.3321/j.issn:1000-4548.1999.01.018 CHEN Zheng-han. Deformation, strength, yield and moisture change of a remolded unsaturated loess[J]. Chinese Journal of Geotechnical Engineering, 1999, 21(1): 82-90. (in Chinese) doi: 10.3321/j.issn:1000-4548.1999.01.018
[7]	张登飞, 陈存礼, 李文文, 等. Q₃原状非饱和黄土的水量变化和临界状态特性[J]. 岩土工程学报, 2015, 37(增刊1): 197-201. https://www.cnki.com.cn/Article/CJFDTOTAL-YTGC2015S1038.htm ZHANG Deng-fei, CHEN Cun-li, LI Wen-wen, et al. Characteristics of critical state and water volume change for Q₃unsaturated intact loess[J]. Chinese Journal of Geotechnical Engineering, 2015, 37(S1): 197-201. (in Chinese) https://www.cnki.com.cn/Article/CJFDTOTAL-YTGC2015S1038.htm
[8]	郭楠, 陈正汉, 高登辉, 等. 加卸载条件下吸力对黄土变形特性影响的试验研究[J]. 岩土工程学报, 2017, 39(4): 735-742. https://www.cnki.com.cn/Article/CJFDTOTAL-YTGC201704025.htm GUO Nan, CHEN Zhen-han, GAO Deng-hui, et al. Experimental research on influences of suction on deformation characteristics of loess under unloading- reloading conditions[J]. Chinese Journal of Geotechnical Engineering, 2017, 39(4): 735-742. (in Chinese) https://www.cnki.com.cn/Article/CJFDTOTAL-YTGC201704025.htm
[9]	高登辉, 陈正汉, 郭楠, 等. 干密度和基质吸力对重塑非饱和黄土变形与强度特性的影响[J]. 岩石力学与工程学报, 2017, 36(3): 736-744. https://www.cnki.com.cn/Article/CJFDTOTAL-YSLX201703023.htm GAO Deng-hui, CHEN Zheng-han, GUO Nan, et al. The influence of dry density and matric suction on the deformation and strength characteristics of the remolded unsaturated loess soils[J]. Chinese Journal of Rock Mechanics and Engineering, 2017, 36(3): 736-744. (in Chinese) https://www.cnki.com.cn/Article/CJFDTOTAL-YSLX201703023.htm
[10]	殷宗泽. 土工原理[M]. 北京: 中国水利水电出版社, 2007: 131-144. YIN Zong-ze. Geotechnical Principle[M]. Beijing: Chinese Water Conservancy and Hydropower Press, 2007: 131-144. (in Chinese)
[11]	GAO Y, SUN D A, ZHU Z C, et al. Hydromechanical behavior of unsaturated soil with different initial densities over a wide suction range[J]. Acta Geotechnica, 2019, 14(2): 417-428. doi: 10.1007/s11440-018-0662-5
[12]	孙德安, 何家浩, 高游. 广吸力范围内压实红黏土的强度特性[J]. 岩土力学, 2017, 38(增刊2): 51-56. https://www.cnki.com.cn/Article/CJFDTOTAL-YTLX2017S2007.htm SUN De-an, HE Jia-hao, GAO You. Strength characteristics of compacted lateritic clay in a wide range of suction[J]. Rock and Soil Mechanics, 2017, 38(S2): 51-56. (in Chinese) https://www.cnki.com.cn/Article/CJFDTOTAL-YTLX2017S2007.htm
[13]	NG C W W, SADEGHI H, JAFARZADEH F. Compression and shear strength characteristics of compacted loess at high suctions[J]. Canadian Geotechnical Journal, 2017, 54(5): 690-699.
[14]	HOYOS L R, SUESCUN-FLOREZ E A, PUPPALA A J. Stiffness of intermediate unsaturated soil from simultaneous suction-controlled resonant column and bender element testing[J]. Engineering Geology, 2015, 188: 10-28.
[15]	高游, 孙德安. 制样方法对非饱和土力学特性的影响[J]. 岩土工程学报, 2016, 38(8): 1529-1534. https://www.cnki.com.cn/Article/CJFDTOTAL-YTGC201608022.htm GAO You, SUN De-an. Effect of specimen preparation on mechanical behavior of unsaturated soils[J]. Chinese Journal of Geotechnical Engineering, 2016, 38(8): 1529-1534. (in Chinese) https://www.cnki.com.cn/Article/CJFDTOTAL-YTGC201608022.htm
[16]	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.
[17]	秦冰, 陈正汉, 孙发鑫, 等. 高吸力下持水曲线的温度效应及其吸附热力学模型[J]. 岩土工程学报, 2012, 34(10): 1877-1886. https://www.cnki.com.cn/Article/CJFDTOTAL-YTGC201210017.htm QIN Bing, CHEN Zheng-han, SUN Fa-xin, et al. Temperature effect on water retention curve under high suction and its modeling based on thermodynamics of sorption[J]. Chinese Journal of Geotechnical Engineering, 2012, 34(10): 1877-1886. (in Chinese) https://www.cnki.com.cn/Article/CJFDTOTAL-YTGC201210017.htm

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Mechanical behavior of unsaturated intact loess over a wide suction range

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