{"title":"Threshold Stress of the Soil Subgrade Evaluation for Highway Formations","authors":"Elsa Eka Putri, N.S.V Kameswara Rao, M. A. Mannan","volume":68,"journal":"International Journal of Civil and Environmental Engineering","pagesStart":580,"pagesEnd":587,"ISSN":"1307-6892","URL":"https:\/\/publications.waset.org\/pdf\/8193","abstract":"The objective of this study is to evaluate the threshold\nstress of the clay with sand subgrade soil. Threshold stress can be\ndefined as the stress level above which cyclic loading leads to\nexcessive deformation and eventual failure. The thickness\ndetermination of highways formations using the threshold stress\napproach is a more realistic assessment of the soil behaviour because\nit is subjected to repeated loadings from moving vehicles. Threshold\nstress can be evaluated by plastic strain criterion, which is based on\nthe accumulated plastic strain behaviour during cyclic loadings [1].\nSeveral conditions of the all-round pressure the subgrade soil namely,\nzero confinement, low all-round pressure and high all-round pressure\nare investigated. The threshold stresses of various soil conditions are\ndetermined. Threshold stress of the soil are 60%, 31% and 38.6% for\nunconfined partially saturated sample, low effective stress saturated\nsample, high effective stress saturated sample respectively.","references":"[1] Shahu, J. T., Yudhbir, and Kameswara Rao, N.S.V. 1999. \"Effective\nstress behavior of quasi-saturated compacted cohesive soils.\" Journal of\nGeotechnical and Geoenvironmental Engineering, Vol 125 pp. 322-329.\n[2] Huang H. Yang. 1993. Pavement Analysis and Design, Prentice Hall\nEnglewood Cliff, New Jersey.\n[3] Ishihara, K. 1993. Liquefaction and Flow Failure During Earthquakes,\nThe 33rd Rankine Lecture. 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