Simple predicting method for permeation coefficient of saturated soil body based on fractal theory

A technology of permeability coefficient and prediction method, which is applied in the field of soil saturated permeability coefficient research, can solve the problems of cumbersome calculations, and achieve the effect of overcoming cumbersome calculations

Inactive Publication Date: 2018-12-11
HUBEI UNIV OF TECH
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to address the deficiencies of the above-mentioned technologies, to provide a simplified prediction method for the permeability coefficient of saturated soil based on the fractal theory, which overcomes the disadvantages in the prior art that the prediction of the permeability coefficient is based on the empirical method and the calculation is cumbersome.

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  • Simple predicting method for permeation coefficient of saturated soil body based on fractal theory
  • Simple predicting method for permeation coefficient of saturated soil body based on fractal theory
  • Simple predicting method for permeation coefficient of saturated soil body based on fractal theory

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Effect test

Embodiment 1

[0085] According to the maximum initial void ratio e measured before deformation of cohesive soil in Wuhan listed in Table 1 0 =1.115, its saturated permeability coefficient k s =2.806E-04cm / s, air intake value ψ a =1.660kPa, porosity θ=0.527, substituting in formula (1), formula (13) respectively can calculate the comprehensive proportional constant in formula (1), formula (13) (this comprehensive proportional constant includes k c , all constant terms of the fractal dimension D value). The comprehensive proportionality constant of formula (1) can be calculated and the comprehensive proportional constant of formula (6) In the case where the comprehensive proportional constant of each soil is known, during the deformation process, only the void ratio e and the air intake value ψ a (or obtained by data fitting) can predict the corresponding saturated permeability coefficient value. such as e 1 =1.037, ψ 1 =2.150kPa, the corresponding formula (1) 1.62E-04cm / s, k in fo...

Embodiment 2

[0087] According to the maximum initial void ratio e measured before deformation of Touchet silt loam listed in Table 1 0 =1.012, its saturated permeability is 0.695μm 2 , Intake value ψ a =4.130kPa, porosity θ=0.503, substituting into formula (1), formula (13) respectively can calculate the comprehensive proportional constant in formula (1), formula (13) (this comprehensive proportional constant includes k c , all constant terms of the fractal dimension D value). It can be calculated that the comprehensive proportional constant of formula (1) is 23.567 and the comprehensive proportional constant of formula (13) is 46.854. In the case where the comprehensive proportional constant of each soil is known, during the deformation process, only the void ratio e and the air intake value ψ a (or obtained by data fitting) can predict the corresponding saturated permeability. such as e 1 =0.916, ψ 1 =5.070kPa, the comprehensive proportional constant of formula (1) and the comprehe...

Embodiment 3

[0089] According to the maximum initial void ratio e measured before deformation of the Columbia sandy loam listed in Table 1 0 =1.268, its saturated permeability is 2.470μm 2 , Intake value ψ a =2.650kPa, porosity θ=0.559, respectively substituting in formula (1), formula (13) can calculate the comprehensive proportional constant in formula (1), formula (13) respectively (this comprehensive proportional constant includes k c , all constant terms of the fractal dimension D value). It can be calculated that the comprehensive proportional constant of formula (1) is 31.029 and the comprehensive proportional constant of formula (13) is 55.509. In the case where the comprehensive proportional constant of each soil is known, during the deformation process, only the void ratio e and the air intake value ψ a (or obtained by data fitting) can predict the corresponding saturated permeability. such as e 1 =1.114, ψ 1 =3.340kPa, the comprehensive proportional constant of the corresp...

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Abstract

The invention discloses a simple predicting model for permeation coefficient of a saturated soil body based on a TK saturated permeation coefficient model and a soil-water feature curve fractal model.The simple predicting model is shown in the attached figure. The simple predicting model has the advantage that the corresponding permeation coefficient of the saturated soil body is obtained, the defects of using of empirical method as the main method for predicting permeation coefficient and complicated calculation in the prior art are overcome, and the important meaning is realized on the application of physical engineering and the theory study.

Description

technical field [0001] The invention belongs to the technical field of soil saturated permeability coefficient research in civil engineering and geotechnical engineering, and in particular relates to a simplified prediction method for saturated soil permeability coefficient based on fractal theory. Background technique [0002] The influence law of saturated permeability coefficient and air intake value of deformed soil is the basis for establishing a soil constitutive model considering the interaction of hydraulic and mechanical properties, and conducting research on fluid-solid coupling analysis of saturated soil. The relationship between saturated permeability coefficient and gas inlet value is of great significance. For the saturated permeability coefficient under deformation conditions, it is generally predicted by establishing an empirical relationship with the void ratio. This method does not study the relevant mechanism deeply enough, and the prediction accuracy need...

Claims

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Application Information

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IPC IPC(8): G01N15/08
CPCG01N15/08
Inventor陶高梁张琎炜肖衡林马强李丽华朱志政付佩彭弯罗晨晨陈阳阳
OwnerHUBEI UNIV OF TECH