Universal soil shrinkage curve equation

Geoderma ◽  
2015 ◽  
Vol 237-238 ◽  
pp. 78-87 ◽  
Author(s):  
E.C. Leong ◽  
M. Wijaya
Keyword(s):  
Shrinkage Curve ◽  
Soil Shrinkage ◽  
Curve Equation

Use of a three-dimensional scanner for shrinkage curve tests

2019 ◽  
Vol 56 (4) ◽  
pp. 526-535 ◽  
Author(s):  
Jonathan M. Wong ◽  
David Elwood ◽  
Delwyn G. Fredlund
Keyword(s):  
Void Ratio ◽  
Linear Regression Analysis ◽  
Three Dimensional ◽  
High Plasticity ◽  
3D Scanner ◽  
Shrinkage Curve ◽  
Limit Test ◽  
Individual Specimen ◽  
Curve Equation ◽  
Different Soils

A procedure is proposed for conducting shrinkage limit tests using a three-dimensional (3D) scanner. Shrinkage limit tests were conducted on 27 different soils of varying plasticity. In this study only eight of the shrinkage curves were determined using 3D scanning techniques, while the remaining 19 were taken from literature. An individual specimen was scanned between 30 and 50 times to produce a high-resolution shrinkage curve. Shrinkage curves for each material were obtained by curve fitting a shrinkage model to the measured dataset. The primary intent of the research was to relate the shrinkage curve equation to the plasticity of a given soil. Using linear regression analysis, an empirical correlation was developed to reasonably relate parameter csh from the shrinkage model to the ratio of the plastic and liquid limits. The shrinkage curves produced based on the model have an average difference of ∼1.2% in terms of measured void ratio and predicted void ratio. The method was demonstrated to be robust for materials of low, medium, and high plasticity. The proposed methodology also presents a means of estimating a shrinkage curve in its entirety based solely on the volume of an air-dried sample, the specific gravity, and Atterberg limits of the specimen. This effectively reduces the amount of work needed to derive the shrinkage curve and could potentially reduce the time for a shrinkage limit test by half or more.

A New Approach to Measure Soil Shrinkage Curve

2018 ◽  
Vol 42 (1) ◽  
pp. 20150237 ◽  
Author(s):  
Lin Li ◽  
Xiong Zhang
Keyword(s):  
New Approach ◽  
Shrinkage Curve ◽  
Soil Shrinkage

Quantification of the effects of zero and mechanical tillage on a vertisol by using shrinkage curve indexes

Soil Research ◽  
1988 ◽  
Vol 26 (3) ◽  
pp. 537 ◽  
Author(s):  
D Mcgarry
Keyword(s):  
Surface Layer ◽  
Bulk Density ◽  
Specific Volume ◽  
Shrinkage Curve ◽  
Soil Shrinkage ◽  
Straight Lines

The effect of zero versus mechanical tillage on the structure of the top 0.1 m of a Vertisol at Hermitage, near Warwick, Queensland, was examined by using indices derived from fitting three straight lines to soil shrinkage data. The data were generated from the slow drying of initially, near-saturated, SARAN-coated soil clods. Values of specific volume and the specific volume of air-filled pores were significantly greater in the mechanically tilled rather than the zero-tilled soil, showing that mechanical tillage has led to decreased bulk density and increased porosity in the surface layer of this soil.

Temporal dynamics of paddy soil structure as affected by different fertilization strategies investigated with soil shrinkage curve

2019 ◽  
Vol 187 ◽  
pp. 102-109 ◽  
Author(s):  
Huan Fang ◽  
Zhongbin Zhang ◽  
Daming Li ◽  
Kailou Liu ◽  
Kun Zhang ◽  
...  
Keyword(s):  
Paddy Soil ◽  
Soil Structure ◽  
Temporal Dynamics ◽  
Shrinkage Curve ◽  
Soil Shrinkage
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