Prediction method of air intake value of deformed soil based on vg model

A prediction method and technology of air intake value, which are applied in soil material testing, measuring device, suspension and porous material analysis, etc. The effect of convenient pore distribution characteristics of unsaturated soil, simple prediction model, and reduced calculation process difficulty

Active Publication Date: 2020-11-03
HUBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The prediction of air intake value often adopts the traditional mapping method or the result of fitting parameter estimation, the calculation process is more complicated, there are many human factors, and the prediction of air intake value of soil under deformation conditions is more cumbersome

Method used

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  • Prediction method of air intake value of deformed soil based on vg model
  • Prediction method of air intake value of deformed soil based on vg model
  • Prediction method of air intake value of deformed soil based on vg model

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Experimental program
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Effect test

Embodiment 1

[0025] like figure 1 As shown, the method for predicting air intake value of deformed soil based on the VG model provided in this embodiment includes the following steps:

[0026] Step 1. Measured matrix suction ψ under deformation conditions based on pressure plate tests 0 and measured mass moisture content w 0 series of measured data.

[0027] The instrument used in the pressure plate test is a volumetric pressure plate instrument. The air pressures are 5kPa, 10kPa, 30kPa, 80kPa, 160kPa, 280kPa, 450kPa, 700kPa, and 1250kPa. The water content of the sample mass can only be applied to the next level of pressure after the upper level is balanced, and finally the test data under different initial void ratios are obtained. Among them, the measured data include the measured matrix suction ψ 0 and measure mass moisture content w 0 . In this embodiment, as shown in Table 1 below, there are 10 groups of measured data.

[0028] Table 1 The measured data table of the soil-water ...

Embodiment 2

[0048] In the second embodiment, the specific prediction method is the same as that in the first embodiment, so it will not be repeated, only the specific data will be described: the measurement fitting parameter a 0 、m 0 , n 0 They are 0.5607, 0.03144, and 3.947 respectively. Substituting the measured fitting parameters and the k value with a void ratio of 0.97 after deformation into the prediction model of air intake value of deformed soil, the predicted air intake value of deformed soil is 6.79kPa, and the measured value is 5.70kPa.

Embodiment 3

[0050] In the third embodiment, the specific prediction method is the same as that in the first embodiment, so it will not be repeated, and only the specific data will be described: the measurement fitting parameter a 0 、m 0 , n 0 They are 0.5607, 0.03144, and 3.947 respectively. Substituting the measured fitting parameters and the k value with a void ratio of 0.90 after deformation into the prediction model of air intake value of deformed soil, the predicted air intake value of deformed soil is 13.29kPa, and the measured value is 10.42kPa.

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Abstract

The invention provides a method for predicting an air entry value of a deformed soil based on a VG model, and can quickly and effectively predict the air entry value of the deformed soil. The method is characterized by comprising the following steps: step1, measuring a series of actually measured data of a measured matrix suction [psi]0 and a measured mass water content w0 under a deformation condition based on a pressure plate test; step2, substituting the series of actually measured data of the measured matrix suction [psi]0 and the measured mass water content w0 into the VG model, fitting asoil-water characteristic curve to obtain measured fitting parameters a0, m0, n0 based on the soil-water characteristic curve; and step3, substituting the measured fitting parameters a0, m0 and n0 into a prediction model for the air entry value of the deformation soil, and calculating the air entry value of the soil under the deformation condition, that is the predicted value.

Description

technical field [0001] The invention belongs to the technical field of soil pore structure distribution characteristics and unsaturated soil water-holding characteristics, and in particular relates to a method for predicting air intake value of deformed soil based on a VG model. [0002] technical background [0003] Intake suction value ψ a (air entry value) refers to the suction value when the saturated soil begins to enter the air during the dehydration process. When the water in the soil is saturated, if a slight suction is applied to the soil, no water will be discharged from the soil, and the water content will still maintain the saturated value. When the suction increases to the intake suction value, the largest pores in the soil cannot resist the applied suction, so the soil starts to drain and the water content begins to decrease. The air intake value (that is, the air intake suction value) is a sudden change point on the soil-water characteristic (dehumidification...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N15/08G01N33/24
CPCG01N15/0893G01N33/246
Inventor 陶高梁罗晨晨肖衡林马强万娟朱志政付佩陈阳阳彭弯张琎炜
Owner HUBEI UNIV OF TECH
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