Test Study on the Compressive Strength Properties of Compacted Clayey Soil

Abstract:

In order to study the effect of water content, degree of compaction and stress state on bearing capacity of subgrade, the engineering compacted clayey soil was taken as the subject investigated, regulation of compressive strength changing with water content, degree of compaction and confining pressure were analyzed through triaxial compression test, and function relationships between compressive strength and water content, degree of compaction and stress state were fitted based on the test data. Results show that effects of water content, degree of compaction and confining pressure on compressive strength properties of subgrade compacted clayey soil are all remarkably. The compressive strength decreases according to a quadratic function with the increase of water content, as well as increases in accordance with a quadratic function with the increase of the degree of compaction, and increases linearly with the increase of confining pressure. Improving the construction compaction standard properly, adopting the essential lateral confinement measure and keeping a lower water content of the subgrade in service can improve the bearing capacity and stability of the highway subgrade.

• Periodical: Key Engineering Materials (Volume 703)
• Pages: 380-385
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.703.380
• Online since: August 2016
• Authors: Han Bing Liu, Hu Zhu Zhang, Jing Wang*
• Keywords: Compacted Clayey Soil, Compressive Strength, Confining Pressure, Degree of Compaction, Water Content

References

[1] J.Y. Yuan, J.G. Qian and H.M. Zhang et al. Soil Properties and Soil Mechanics, China Communications Press, Beijing, (2009).

[2] Z.J. Lu, Problems on the research of shear strength of clayey soils, China Civil Engineering Journal, 32(1999) 3-9.

[3] Y.D. Luo, Research on shear strength of compacted soils considering saturation degree, Rock and Soil Mechanics, 32(2011) 3144-3147.

[4] E. Cokca, O. Erol and F. Armangil, Effects of compaction moisture content on the shear strength of an unsaturated clay, Geotechnical and Geological Engineering, 22 (2004) : 285-297.

DOI: 10.1023/b:gege.0000018349.40866.3e

[5] C.L. Chen, X. Jiang and T. Z. Su, et al, Influence of soil Structure on Unconfined Compression Behaviour of Compacted Loess, Chinese Journal of Rock Mechanics and Engineering, 33(2014): 2539-2545.

[6] Qin Yiping. Resilience factors of subgrade modulus and its' associated relationship, Master dissertation of Chang'an University, Xi'an, (2005).

[7] China Second Highway Survey, Design and Research Institute of Communications, Specifications for design of highway subgrades, China Communications Press, Beijing, (2015).