TITLE:
Effects of Moisture Content and Plasticity Index on Duncan-Chang Model Parameters of Hydraulic Fill Soft Soil
AUTHORS:
Erzhong Chen, Meng Yan, Jihui Ding, Cen Gao, Yu Gan
KEYWORDS:
Moisture Content, Plasticity Index, Duncan-Chang Model, Unconsolidated Undrained Test
JOURNAL NAME:
World Journal of Engineering and Technology,
Vol.7 No.3,
August
7,
2019
ABSTRACT: In order to explore the effects of moisture content and plasticity index on Duncan-Chang model parametersK,n,CandRf,we selected 8 groups of soft soil with water content of 69.1%-94.3% and plasticity index of 32.2-54.1 for triaxial unconsolidated undrained shear test. The results show thatCuu,Kandnvalues all showed a downward trend, andRfvariation was not obvious with the increase of moisture content. The variation rule of each parameter is not obvious with the increase of plasticity index. When moisture content is constant,Cuuandnvalues do not change much,Kincreases with the increase of plasticity index within the range of 70%-80% moisture content, and does not change much with the increase of plasticity index when moisture content is greater than 80%,Rfhas no obvious rule.When the plasticity index is constant,Cuu,Kandndecrease with the increase of moisture content,Rfhas no obvious rule. The maximum value ofCuuis 20.18kPa, the minimum is 3.72kPa, and the maximum to minimum ratio is 5.42. The maximum value ofKis 0.517, the minimum is 0.022, and the maximum to minimum ratio is 23.5. The maximum value ofnis 1.198, the minimum is 0.150, and the maximum to minimum ratio is 7.99. The maximum value ofRfis 0.872, the minimum is 0.679, and the maximum to minimum ratio is 1.28.