Experimental Study of Silty Clay Plane Strain Tri-axial Test under RTC Path and Modified Cam-clay Model

Tao Cheng, Yi Zhang, Keqin Yan

Abstract


The character of geomaterials is affected by stress path remarkably. Under different stress paths, the stress-strain characteristics of geomaterials are difference. For the unloading path in existing engineering situation, the physical parameters and constitutive model is usually determined by loading test. The path to uninstall the actual project conditions which may be a larger error. Therefore, this work proceeding from the actual project, deep excavation of the lateral unloading condition is analysed. The tests of CTC path and RTC path on silty clay in Huangshi city of china by multi-path tri-axial plane strain are carried on in the geotechnical Engineering Laboratory of Huangshi Institute of Technology. Then, the phenomenon under the two stress paths are compared with each other and describing the differences between them. The mechanical properties in the RTC stress path is analyzed mainly. Based on the Cam-Clay model framework, then derived this material yield equation based on Cam-clay model, Laiding the foundation for the numerical analysis.


Keywords


Silty Clay; RTC Stress Path; Plane Strain Test; Modified Cam-Clay Model.

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References


LambeT. W.“Stress path method.”.Journal of the Soil Mechanics and Foundations Division, ASCE, 1967,93(SM6):309 - 331.

LambeT. W., MarrW. A. “Stress path method, Second Education.” Journal of the Geotechnical Engineering Division. ASCE,1979,105(GT6):727-738.doi:10.1016/0148-9062(79)90036-6.

Qin S. L., Yang L. Q., GAO H., et al. “Experimental Study of Mechanical Properties of Coarse Aggregates of Sericite Schist Under Different Stress Paths.“ Chinese Journal of Rock Mechanics and Engineering. 2014,33(9):1 932-1 938. doi:10.13722/j.cnki.jrme.2014.09.025.

Zhao J. J. ,Jiang X.. “Test Research of Mechanical Properties of Marine Soft Soil under Unloading Stress Path”. Journal of Tianjin CHENGJIAN University. 2015,21(4):267-272. doi:10.3969/j.issn.1006-6853.2015.04.007.

Li X. B., Guo L., Cai Y. Q., Hu X. Q..” Stress path tri-axial tests on K0-consolidated saturated soft clay”. Journal of Central South University (Science and Technology). 2015, 46(5):1820-1825. doi:10.11817/j.issn.1672-7207.2015.05.033.

Charles W. W. Ng. “Stress paths in relation to deep excavation”. Journal of Geotechnical and Geoenvironmental Engineering,1999,125(5):357-363.doi:10.1061/(asce)1090-0241(1999)125:5(357).

Yuan J., Gong X. N.. “Analysis of soft clay during excavation”. Journal of Zhejiang University (Engineering Science),2001,35(5):465-470.doi:10.3785/j.issn.1008-973X.2001.05.001.

Cheng T., Yan K. Q. “Numerical simulation for influences of stress paths on earth's surface deformation”. Rock and Soil Mechanics, 2010 , 31 (2) :661-666. Doi:10.3969/j.issn.1000-7598.2010.02.055

Chen K., Yan S. W., Sun L. Q., et al. “ Analysis of deformation of deep foundation pit under excavation unloading condition”. Rock and Soil Mechanics. 2016,37(4).doi:10.16285/j.rsm.2016.04.021.

Zhang K. Y., ,Li G. S., Mei X. H., et al. “Stress-deformation characteristics of silty soil based on K0 consolidation and drainage unloading stress path tests” Chinese Journal of Geotechnical Engineering. 2017 39(7).doi:10.11779/CJGE201707003.

Cheng, T., Wang, J. T., Yan, K. Q., et al. “Coupling analysis method for elastoplastic consolidation of clay considering stress paths”. Chinese Journal of Rock Mechanics and Engineering, 2008, 27(5): 403–412. doi:10.3321/j.issn:1000-6915.2008.02.025

Cheng T., Yan K. Q., Zheng J. J., et al. “Semi-analytical and semi-numerical method for plane strain consolidation of double-layer foundation considering stress paths”. European Journal of Environmental and Civil Engineering, 2017,21(10):1187-1216. doi: 10.1080/19648189.2016.1150903

Cheng T., Yan K. Q., Zheng J. J., et al. “Semi-analytical and semi-numerical method for the single soil layer consolidation problem” Engineering Computations, 2017,34(3):960-987. doi: 10.1108/EC-10-2015-0297

Feng T. G., Jiang Z. Q. "Research of constitutive models reflecting stress-strain relationship in lateral unloading conditions.” Journal of PLA University of Science and Technology (Natural Science Edition). 2013, 14(2):202-206.doi:10.3969/j.issn.1009-3443.2012.09.040.

Cheng, T., “Study on numerical modeling and consolidation problem of clay”, PhD Diss.,Huazhong University of Science and Technology, 2006.

Zhang R.T., Chen S. Y. “An experimental study on stress-strain behavior of soft clay along decreasing average normal stress” .Rock and Soil Mechanics, 2002,23(5):612-616.doi:10.3969/j.issn.1000-7598.2002.05.019.

Lu P. Y., Chen S. Y., Xiong L. Z., et al. “Elastoplastic Constitutive Equation for Hydraulic-fill Soil of Slurry-fall Dam”. Chinese Journal of Geotechnical Engineering, 1984,6(2):23-39.

Cheng T., Yan K. Q., Zhang H. Z., et al. “ Uniform nonlinear constitutive model and parameters for clay in different consolidation conditions based on regressing method”. 2014, (5):1-8. doi: 10.1155/2014/804586.

Zhang, Y., Kim, C.W., Beer, M., Dai, H., Guedes Soares, C., “Modeling multivariate ocean data using asymmetric copulas.” Coastal Engineering, 2018, 135, 91-111. DOI: 10.1016/j.coastaleng.2018.01.008.

Zhang, Y., Kim, C.W., Tee, K.F. “Maintenance management of offshore structures using Markov process model with random transition probabilities.” Structure and Infrastructure Engineering, 2017, 13(8), 1068-1080. DOI: 10.1080/15732479.2016.1236393.

Zhang, Y., Lam, J.S.L. “Estimating economic losses of industry clusters due to port disruptions.” Transportation Research Part A: Policy and Practice, 2016, 91, 17-33. DOI: 10.1016/j.tra.2016.05.017.

Zhang, Y. “A fuzzy residual strength based fatigue life prediction method.” Structural Engineering and Mechanics, 2015, 56(2), 201-221. DOI: 10.12989/sem.2015.56.2.201.

Zhang, Y., Lam, J.S.L. “Reliability analysis of offshore structures within a time varying environment.” Stochastic Environmental Research and Risk Assessment, 2015, 29(6), 1615-1636. DOI: 10.1007/s00477-015-1084-7.




DOI: https://doi.org/10.28991/cej-0309112

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