Static Characteristics of Coarse-Grained Soils

 

Guodong Deng

School of Civil Engineering, Central South University, Changsha 410075, China. *Corresponding author, e-mail: csudgd@163.com

Jiasheng Zhang

School of Civil Engineering, Central South University, Changsha 410075, China; e-mail: csutmjs@163.com

Fei Meng

School of Civil Engineering, Central South University, Changsha 410075, China; e-mail: csutmxb@163.com

Song Wang

School of Civil Engineering, Central South University, Changsha 410075, China; e-mail: csutmmf@163.com 

Xiong Shi

School of Civil Engineering, Central South University, Changsha 410075, China; e-mail: csutmmf@163.com 

 

 ABSTRACT

This paper presents investigations on the static characteristics of Coarse-grained soils. A series of large-scale triaxial tests of the coarse-grained soils indicates that their static characteristics depend upon the proportion in which they are present. When the amount of coarse-grained soils is in the range of 30%~50%, the shearing strength is increased rapidly, and of the test samples are found to soften. In the compacted tests of grains-containing soils, the largest dry density of coarse grains and the content of coarse grains have relationship of parabola. The largest dry density as content of coarse grains increased first and later decreased. The compacted dry density has peak value when the content of coarse-grains (P5) is 52.57%. The degree of compaction above a value of 93% has insignificant effect on the strength of coarse-grained soils. The strength of soils is determined by the ambient pressure, but the collected straining decreases by increase in degree of compaction. A linear relationship is obtained for best water ratios and the content of coarse grains. In this study, the parabola-curve about the origins of axial straining square and lateral straining is investigated.

Keywords: Coarse-grained soils, static characteristics, constitutive relations, Large-scale triaxial tests

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