The relationship among the surface fissure ratio, moisture content, seepage coefficient and deformation modulus of field unsaturated expansive soil in Nanning, Guangxi Province, China, was obtained by a direct or indirect method. Digital images of expansive soil of the surface fissure with different moisture contents were analyzed with the binarization statistic method. In addition, the fissure fractal dimension was computed with a self-compiled program. Combined with in situ seepage and loading plate tests, the relationship among the surface fissure ratio, moisture content, seepage coefficient and deformation modulus was initially established. The surface fissure ratio and moisture content show a linear relation, “y=−0.019 1x+1.028 5” for rufous expansive soil and “y=−0.071x+2.610 5” for grey expansive soil. Soil initial seepage coefficient and surface fissure ratio show a power function relation, “y=1×10−9exp(15.472x)” for rufous expansive soil and “y=5×10−7exp(4.209 6x)” for grey expansive soil. Grey expansive soil deformation modulus and surface fissure ratio show a power function relation of “y=3.935 7exp(0.993 6x)”. Based on the binarization and fractal dimension methods, the results show that the surface fissure statistics can depict the fissure distribution in the view of two dimensions. And the evolvement behaviors of permeability and the deformation modulus can indirectly describe the developing state of the fissure. The analysis reflects that the engineering behaviors of unsaturated expansive soil are objectively influenced by fissure.
[1]
Yong Zhang,et al.
Study on permeability test and curve prediction of expansive soil
,
2011,
2011 Second International Conference on Mechanic Automation and Control Engineering.
[2]
A. Seco,et al.
Stabilization of expansive soils for use in construction
,
2011
.
[3]
S. Nazarian,et al.
Quality Assessment and Quality Control of Deep Soil Mixing Construction for Stabilizing Expansive Subsoils
,
2010
.
[4]
Abbas Ahmadi,et al.
Fractal dimension of soil aggregates as an index of soil erodibility
,
2011
.
[5]
Chao‐sheng Tang,et al.
Influencing factors of geometrical structure of surface shrinkage cracks in clayey soils
,
2008
.
[6]
Yuan Jun-ping.
Numerical model and simulation of expansive soils slope infiltration considered fissures
,
2004
.
[7]
Isabelle Cousin,et al.
Numerical modelling of direct current electrical resistivity for the characterisation of cracks in soils
,
2007
.
[8]
A. Skempton.
Long-Term Stability of Clay Slopes
,
1964
.
[9]
Oswald Rendon-Herrero.
Special Issue on Construction on Expansive Soils
,
2011
.
[10]
Tammo S. Steenhuis,et al.
Preferential paths of flow under conventional and conservation tillage
,
1990
.