Deformation strength characteristics of unsaturated remoulded loess simulated by BBM model

ZHENG Fang; SHAO Shengjun

doi:10.11779/CJGE20230327

Volume 46 Issue 8

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Chinese Journal of Geotechnical Engineering > 2024 > 46(8): 1665-1674. > DOI: 10.11779/CJGE20230327

ZHENG Fang, SHAO Shengjun. Deformation strength characteristics of unsaturated remoulded loess simulated by BBM model[J]. Chinese Journal of Geotechnical Engineering, 2024, 46(8): 1665-1674. DOI: 10.11779/CJGE20230327

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Deformation strength characteristics of unsaturated remoulded loess simulated by BBM model

ZHENG Fang^{1, 2,},
SHAO Shengjun^{3, 4}

1.
School of Civil Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China
2.
Shaanxi Key Laboratory of Geotechnical and Underground Space Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China
3.
Institute of Geotechnical Engineering, Xi'an University of Technology, Xi'an 710048, China
4.
Shaanxi Key Laboratory of Loess Mechanics and Engineering, Xi'an University of Technology, Xi'an 710048, China

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Received Date: April 13, 2023
Available Online: October 24, 2023

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Abstract

Abstract

The BBM model for unsaturated soils is analyzed, studied and validated. A modification is further made to the BBM model, so that the model is more consistent with the variation of matric suction in unsaturated loess. The iterative calculation method for the BBM model in the literature is performed under the stress path of b-constant and σ₃-constant with b=0. A revision is made on the existing calculation method, and then the calculation method for the BBM model under the stress paths of b-constant and p-constant with b=0 is given. Based on the results of the true triaxial suction experiments on unsaturated loess, the relevant model parameters of the BBM model are obtained, and the corresponding calculation method is used to predict the test results of the unsaturated loess under the stress paths of b-constant and p-constant with b=0. In order to consider the nonlinear change of model parameters with matric suction for unsaturated loess, a hyperbolic function is adopted to modify the BBM model. The modified model is verified, and the results show that the overall predicted results of the revised model are ideal, especially the predicted ones under low matric suction and low net mean stress are more ideal than those of the original model.
- unsaturated loess,
- matric suction,
- constitutive model,
- stress state,
- model parameter

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References (24)

References

[1]	陈正汉, 周海清, FREDLUND D G. 非饱和土的非线性模型及其应用[J]. 岩土工程学报, 1999, 21(5): 603-608. http://cge.nhri.cn/cn/article/id/10399 CHEN Zhenghan, Zhou Haiqing, FREDLUND D G. Nonlinear model for unsaturated soils and its application[J]. Chinese Journal of Geotechnical Engineering, 1999, 21(5): 603-608. (in Chinese) http://cge.nhri.cn/cn/article/id/10399
[2]	王朝阳. 非饱和黄土的强度特性及非线性本构模型研究[D]. 西安: 长安大学, 2004. WANG Zhaoyang. Study on Strength Characteristics and Nonlinear Constitutive Model of Unsaturated Loess[D]. Xi'an Chang'an University, 2004. (in Chinese)
[3]	章峻豪, 陈正汉, 赵娜, 等. 非饱和土的新非线性模型及其应用[J]. 岩土力学, 2016, 37(3): 616-624. https://www.cnki.com.cn/Article/CJFDTOTAL-YTLX201603003.htm ZHANG Junhao, CHEN Zhenghan, ZHAO Na, et al. A new nonlinear model of unsaturated soils and its application[J]. Rock and Soil Mechanics, 2016, 37(3): 616-624. (in Chinese) https://www.cnki.com.cn/Article/CJFDTOTAL-YTLX201603003.htm
[4]	凌华, 殷宗泽, 蔡正银. 非饱和土的应力-含水率-应变关系试验研究[J]. 岩土力学, 2008, 29(3): 651-655. https://www.cnki.com.cn/Article/CJFDTOTAL-YTLX200803016.htm LING Hua, YIN Zongze, CAI Zhengyin, et al. Experimental study on stress-water content-strain relationship of unsaturated soil[J]. Rock and Soil Mechanics, 2008, 29(3): 651-655. (in Chinese) https://www.cnki.com.cn/Article/CJFDTOTAL-YTLX200803016.htm
[5]	胡再强, 马素青, 李宏儒, 等. 非饱和黄土非线性K-G模型试验研究[J]. 岩土力学, 2012, 33(增刊1): 56-60. https://www.cnki.com.cn/Article/CJFDTOTAL-YTLX2012S1009.htm HU Zaiqiang, MA Suqing, LI Hongru, et al. Experimental study of nonlinear K-G model for unsaturated loess[J]. Rock and Soil Mechanics, 2012, 33(S1): 56-60. (in Chinese) https://www.cnki.com.cn/Article/CJFDTOTAL-YTLX2012S1009.htm
[6]	谢定义. 非饱和土土力学[M]. 北京: 高等教育出版社, 2015. XIE Dingyi. Soil Mechanics for Unsaturated Soils[M]. Beijing: Higher Education Press, 2015. (in Chinese)
[7]	ALONSO E E, GENS A, JOSA A. A constitutive model for partially saturated soils[J]. Géotechnique, 1990, 40(3): 405-430. doi: 10.1680/geot.1990.40.3.405
[8]	JOSA A, BALMACEDA A, GENS A, et al. An elastoplastic model for partially saturated soils exhibiting a maximum of collapse[C]// Proceedings, 3rd International Conference on Computational Plasticity, Barcelona, 1992.
[9]	黄海, 陈正汉, 李刚. 非饱和土在p-s平面上的屈服轨迹及土-水特征曲线的探讨[J]. 岩土力学, 2000, 21(4): 316-321. https://www.cnki.com.cn/Article/CJFDTOTAL-YTLX200004002.htm 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) https://www.cnki.com.cn/Article/CJFDTOTAL-YTLX200004002.htm
[10]	苗强强, 陈正汉, 朱青青. p-s平面上不同应力路径的非饱和土力学特性研究[J]. 岩石力学与工程学报, 2011, 30(7): 1496-1501. https://www.cnki.com.cn/Article/CJFDTOTAL-YSLX201107027.htm MIAO Qiangqiang, CHEN Zhenghan, ZHU Qingqing. Study of mechanics characteristic of unsaturated soils with different stress paths on p-s plane[J]. Chinese Journal of Rock Mechanics and Engineering, 2011, 30(7): 1496-1501. (in Chinese) https://www.cnki.com.cn/Article/CJFDTOTAL-YSLX201107027.htm
[11]	陈正汉. 非饱和土与特殊土力学[M]. 1版. 北京: 中国建筑工业出版社, 2022. CHEN Zhenghan. Mechanics for Unsaturated and Special Soils[M]. 1st ed. Beijing: China Architecture and Building Press, 2022. (in Chinese)
[12]	GENS A, ALONSO E E. A framework for the behaviour of unsaturated expansive clays[J]. Canadian Geotechnique Journal, 1992, 29: 1013-1032. doi: 10.1139/t92-120
[13]	姚仰平, 牛雷, 崔文杰, 等. 超固结非饱和土的本构关系[J]. 岩土工程学报, 2011, 33(6): 833-839. http://cge.nhri.cn/cn/article/id/14018 YAO Yangping, NIU Lei, CUI Wenjie, et al. UH model for unsaturated soils [J]. Chinese Journal of Geotechnical Engineering, 2011, 33(6): 833-839. (in Chinese) http://cge.nhri.cn/cn/article/id/14018
[14]	张登飞. 增湿时原状黄土的水力-力学特性及水气渗透规律研究[D]. 西安: 西安理工大学, 2017. ZHANG Dengfei. Study on Hydraulic-Mechanics Characteristics and Water Vapor Permeability of Undisturbed Loess During Humidification[D]. Xi'an: Xi'an University of Technology, 2017. (in Chinese)
[15]	刘帅帅. 非饱和结构性黄土本构模型研究[D]. 西安: 长安大学, 2018. LIU Shuaishuai. Study on Constitutive Model of Unsaturated Structural Loess[D]. Xi'an: Chang'an University, 2018. (in Chinese)
[16]	MACARI E J, HOYOS L R. Constitutive modeling of unsaturated soil behavior under axisymmetric stress states using a stress/suction-controlled cubical test cell[J]. International Journal of Plasticity, 2003, 19(10): 1481-1515. doi: 10.1016/S0749-6419(02)00018-9
[17]	申春妮, 方祥位, 陈正汉. Q₂黄土的非饱和直剪试验研究[J]. 地下空间与工程学报, 2010, 6(4): 724-728. https://www.cnki.com.cn/Article/CJFDTOTAL-BASE201004013.htm SHEN Chunni, FANG Xiangwei, CHEN Zhenghan. The unsaturated direct shear tests of Q₂ loess[J]. Chinese Journal of Underground Space and Engineering, 2010, 6(4): 724-728. (in Chinese) https://www.cnki.com.cn/Article/CJFDTOTAL-BASE201004013.htm
[18]	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. http://cge.nhri.cn/cn/article/id/10260 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) http://cge.nhri.cn/cn/article/id/10260
[19]	郑方, 邵生俊, 张博, 等. 控制吸力的非饱和土真三轴试验研究[J]. 岩土工程学报, 2019, 41(增刊2): 33-36. doi: 10.11779/CJGE2019S2009 ZHENG Fang, SHAO Shengjun, ZHANG Bo, et al. True triaxial tests on unsaturated soils with suction-controlled condition[J]. Chinese Journal of Geotechnical Engineering, 2019, 41(S2): 33-36. (in Chinese) doi: 10.11779/CJGE2019S2009
[20]	郑方, 邵生俊, 佘芳涛, 等. 重塑黄土在不同基质吸力下的真三轴剪切试验[J]. 岩土力学, 2020, 41(增刊1): 156-162. https://www.cnki.com.cn/Article/CJFDTOTAL-YTLX2020S1018.htm ZHENG Fang, SHAO Shengjun, SHE Fangtao, et al. True triaxial shear tests of remolded loess under different matrix suction[J]. Rock and Soil Mechanics, 2020, 41(S1): 156-162. (in Chinese) https://www.cnki.com.cn/Article/CJFDTOTAL-YTLX2020S1018.htm
[21]	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. doi: 10.11779/CJGE2015S1037 ZHANG Dengfei, CHEN Cunli, LI Wenwen. Characteristics of critical state and water volume change for Q3 unsaturated intact loess[J]. Chinese Journal of Geotechnical Engineering, 2015, 37(S1): 197-201. (in Chinese) doi: 10.11779/CJGE2015S1037
[22]	关亮, 陈正汉, 黄雪峰, 等. 非饱和填土(黄土)强度特性的三轴试验研究[J]. 建筑科学, 2011, 27(11): 55-57. https://www.cnki.com.cn/Article/CJFDTOTAL-JZKX201111015.htm GUAN Liang, CHEN Zhenghan, HUANG Xuefeng, et al. Study on the strength character of unsaturated loess by three-dimensional tests[J]. Building Science, 2011, 27(11): 55-57. (in Chinese) https://www.cnki.com.cn/Article/CJFDTOTAL-JZKX201111015.htm
[23]	党进谦, 李靖. 非饱和黄土的强度特征[J]. 岩土工程学报, 1997, 19(2): 59-64. http://cge.nhri.cn/cn/article/id/9955 DANG Jinqian, LI Jing. Strength Characteristics of Unsaturated Loess[J]. Chinese Journal of Geotechnical Engineering, 1997, 19(2): 59-64. (in Chinese) http://cge.nhri.cn/cn/article/id/9955
[24]	关亮, 陈正汉, 黄雪峰, 等. 非饱和重塑黄土的三轴试验研究[J]. 工程勘察, 2011, 39(11): 14-18. https://www.cnki.com.cn/Article/CJFDTOTAL-GCKC201111005.htm GUAN Liang, CHEN Zhenghan, et al. Study of the tri-axial experiment for the remodeled unsaturated loess[J]. Geotechnical Investigation and Surveying, 2011, 39(11): 14-18. (in Chinese) https://www.cnki.com.cn/Article/CJFDTOTAL-GCKC201111005.htm