Experimental Study on the Combined Effect of Cyclic and Static Loads on the Mechanical Properties of the Saturated Soft Clay Material

Abstract:

The combined effect of cyclic and static loads on the mechanical properties of the soft clay was experimentally investigated by conducting undrained cyclic triaxial tests on Shanghai clay. The results show that an increment in either static or cyclic load increases excess pore pressures and axial strains. For a given value of combined cyclic and static loads, the mechanical properties of the soft clay are more sensitive to the cyclic load. Furthermore, the accumulated excess pore pressure and axial strain for a larger cyclic stress ratio and a lower combined stress ratio might overcome that for a lower cyclic stress ratio and a higher combined stress ratio. The mechanical properties of the soft clay after the cyclic load was unloaded were also discussed. It was observed that the excess pore pressure and axial strain under the static load alone decrease gradually with time. The trend of them largely depends on the ratio of cyclic load to static load.

• Periodical: Key Engineering Materials (Volume 723)
• Pages: 843-848
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.723.843
• Online since: December 2016
• Authors: Yi Wei*, Ying Zhu, Jing Ni
• Keywords: Axial Strain, Combination of Cyclic, Cyclic Triaxial Test, Excess Pore Pressure, Soft Clay Material, Static Loads

References

[1] H. H. Zhong, M. S. Huang, S. M. Wu, et al. On the deformation of soft clay subjected to cyclic loading, Chin. J. Geotech. Eng. 24(5) (2002) 629-632.

[2] J. K. Liu, J. H. Xiao, Experimental study on the stability of railroad silt subgrade with increasing train speed, J. Geotech. Geoenviron. Eng. 136(6) (2010) 833-841.

DOI: 10.1061/(asce)gt.1943-5606.0000282

[3] C. J. Wang, Y. M. Chen, Study on effect of traffic loading induced static deviator stress on undrained cyclic properties of saturated soft clay, Chin. J. Geotech. Eng. 29(11) (2007) 1742-1747.

[4] J. Ni, B. Indraratna, X. Y. Geng, et al. Experimental study of the combined effect of cyclic stress level and loading frequency on the performance of soft clays, Eng., Mechan. 31(10) (2014) 167-173.

[5] M. S. Huang, Z. M. Yao, Explicit model for cumulative strain of saturated clay subjected to cyclic load, Chin. J. Geotech. Eng. 33(3) (2011) 325-331.

[6] H. F. Huo, H. Y. Lei, Cyclic Properties of Normal Consolidated Clay Under Coupled Effect of Static and Dynamic Stresses, Chin. J. Rock Mech. Eng. 6 (2015) 1288-1294.

[7] X. C. Shi, R. Wang, Y. Han, Test research on deformation properties of ooze under unloading, Rock Soil Mech. 25(8) (2004) 1259-1262.

[8] J. Zhou, H. Wang, H. Y. Cai, Pore pressure characteristic analysis of soft clay during unloading based on lab data and numerical calculation, Chin. J. Geotech. Eng. 24(5) (2002) 556-559.