TITLE:
Composite Consolidation Coefficient Analysis of Soft Soil with Drainage Water
AUTHORS:
Jihui Ding, Kaikai You, Zhongmin Feng, Dongxu Sun
KEYWORDS:
Blow Fill Soft Soil, Drainage Unit, Consolidation Coefficient, Consolidation Test
JOURNAL NAME:
World Journal of Engineering and Technology,
Vol.7 No.4,
October
11,
2019
ABSTRACT: The consolidation coefficient is the most basic parameter to calculate the
consolidation rate of soil layer, and the horizontal consolidation coefficient controls
the radial water flow into the drainage well. Based on the background of the soft soil in Shantou,
Guangdong Province, a series of experimental studies on the consolidation characteristics
were carried out by using the modified consolidation instrument. And the concept
of the composite consolidation coefficient of the drained water body was put forward.
The composite consolidation coefficient reflects the consolidation characteristics
of soft soil with drainage water, The test results showed that: 1) The consolidation test
with drainage plate is basically consistent with the load compression curve, but
its consolidation rate is fast, which is reflected by the composite consolidation
coefficient. 2) In the consolidation test of water bodies with drainage, the vertical
consolidation coefficient and radial consolidation coefficient are calculated by “three-point method”, and then the composite consolidation coefficient is obtained. The composite
consolidation coefficient decreases with the increase of drain spacing ratio, effective
drainage diameter and drainage height, which is basically consistent with the theoretical
formula. 3) The vertical consolidation coefficient and radial consolidation coefficient
decrease with the increase of the diameter of the sample, and the difference is
obvious when the load is large. The large-size model with a diameter of 100 mm and a height of 100 mm is about 1.35 times
of the vertical consolidation coefficient of the conventional consolidation test.