Pore Pressure Response and Dissipation of Piezocone Test in Shallow Silty Soil of Yellow River Delta

Journal of Marine Science and Engineering

Tao Liu¹  Chenhao Ding¹  Xiuli Feng²  Yan Zhang²  Shenggui Deng² 

[1] College of Environmental Science and Engineering, Ocean University of China, Qingdao 266100, China;College of Marine Geosciences, Ocean University of China, Qingdao 266100, China;

关键词: dilatant silty soils;    partial drainage;    shallow soil;    yellow river delta;    CPTu;   

DOI  :  10.3390/jmse10020255

来源: DOAJ

【 摘 要 】

Soil dilatancy and partial drainage have great influence on the consolidation coefficient assessment of silty soils with clay content of less than 30% in the Yellow River Delta using the CPTu. This paper discussed the effect of soil dilatancy and partial drainage on the pore pressure response and dissipation of piezocone test in shallow silty soil of the Yellow River Delta through variable penetration rate tests in a pressure chamber and a series of supplementary soil element tests. The results show that the pore pressure dissipation curve is affected by soil type and degree of consolidation. The soil dilatancy is the key factor affecting consolidation coefficient inversion of shallow silt and silty clays. The initial pore pressure is negative and the pore pressure increases to u_max first, but the u_max value is very small in the Yellow River Delta silt. The inversion method used for shear contractile soil cannot be used to invert the mechanical properties of shallow silty soil directly, and a new consolidation curve normalization method is proposed. This paper provides a reference for the consolidation coefficient inversion of CPTu data in the Yellow River Delta area.

【 授权许可】

Unknown