A Method for Predicting Two Characteristic Parameters of Soil-Water Characteristic Curve Based on Mercury Intrusion Intrusion
A technology of water characteristic curve and characteristic parameter, applied in the research field of unsaturated soil hydraulic characteristics
Inactive Publication Date: 2019-11-08
HUBEI UNIV OF TECH
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This method can only show that this method is feasible for fine aggregates, and it is not known whether this method is feasible for soil
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[0040] The implementation of the present invention will be described in detail below in conjunction with the accompanying drawings, but they do not constitute a limitation to the present invention, but are only examples; at the same time, the advantages of the present invention will become clearer and easier to understand through description.
[0041] refer to Figure 1-10 As shown: the present invention realizes the prediction of the fractal dimension and air intake value, more accurately predicts the soil-water characteristic curve, and predicts a curve in which the predicted value and the measured value almost coincide.
[0042] The method for predicting soil-water characteristic curve of the present invention is divided into 3 kinds, as Figure 8-10 As shown, the predicted value of the soil-water characteristic curve is compared with the measured value, and the optimal method for predicting the soil-water characteristic curve is obtained.
[0043] The specific implementat...
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The invention discloses a method for predicting two characteristic parameters of a soil-water characteristic curve based on a mercury intrusion method. The method is characterized in that two parameters which are fractal dimension and a gas inlet value are solved according to pore distribution data, and the soil-water characteristic curve is predicted based on a fractal model. When the fractal dimension is predicted, the invention provides 'critical pore diameter' concept, pore data less than the 'critical pore diameter' is selected and fitted to acquire the optimal fractal dimension. When the gas inlet value is predicted, the invention provides 'maximal characteristic pore diameter' concept, the 'maximal characteristic pore diameter' of the soil is predicted based on the porosity fractal model, and the gas inlet value is subjected to back calculation by using the 'maximal characteristic pore diameter'. Experimental results show that the soil-water characteristic curve predicted by the two characteristic parameters is identical to a measured value. The method for performing fractal prediction on the soil-water characteristic curve based on a mercury intrusion technology, provided by the invention, has extremely important significance in research on unsaturated soil hydraulic characteristics.
Description
technical field [0001] The invention relates to the technical field of research on hydraulic characteristics of unsaturated soil, and more specifically relates to a method for predicting two characteristic parameters of a soil-water characteristic curve based on a mercury intrusion method. Background technique [0002] The soil-water characteristic curve reflects the relationship between soil matric suction and water content. Not only water but also air are filled in the pores of unsaturated soil. The water-air interface (shrink film) has surface tension. In unsaturated soil, the pore air pressure is not equal to the pore water pressure, and the pore air pressure is greater than the pore water pressure, and the shrinkage film bears an air pressure greater than the water pressure. This pressure difference is called matrix suction. [0003] The method of direct measurement can only give the soil-water characteristic curve in a specific state (such as a specific pore structure)...
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IPC IPC(8): G01N15/08
CPCG01N15/088
Inventor 陶高梁朱学良孔令伟肖衡林叶建军马强李丽华李进吴小康陈银
Owner HUBEI UNIV OF TECH