A Prediction Method of Saturated and Unsaturated Soil Permeability Coefficient Based on Nuclear Magnetic Resonance Curve

Abstract

The invention provides a method for predicting the permeability coefficient of saturated soil and unsaturated soil based on nuclear magnetic resonance curves. Permeability proportional constant k of saturated soil combined with permeability test and nuclear magnetic resonance experiment c Calibration was performed to achieve T using saturated soil 2 The distribution curve predicts the permeability coefficient of saturated soil; for the prediction of the unsaturated permeability coefficient of soil in different water content states, it is necessary to conduct nuclear magnetic resonance experiments on the soil in these water content states, and use the T of soil samples in a certain state 2 The distribution curve predicts the relative permeability coefficient in this state, and then obtains the predicted value of the unsaturated permeability coefficient. In addition, the present invention also proposes T 2 The processing method when there is a lack of level in the distribution curve improves the prediction accuracy. The scheme of the present invention can overcome the manpower and material resources and the consumption of a lot of time when the test directly measures the permeability coefficient of saturated soil and unsaturated soil, and overcomes the fact that the existing permeability coefficient prediction method is mainly based on empirical method and the prediction accuracy is relatively low. low downside.

Description

technical field [0001] The invention belongs to the technical field of permeability coefficient research of saturated soil and unsaturated soil in geotechnical engineering, and particularly relates to a method for predicting the permeability coefficient of saturated and unsaturated soil based on nuclear magnetic resonance curves. Background technique [0002] There are closed air bubbles in unsaturated soil, which makes the water need to bypass the air bubbles in the process of infiltration in the soil, which increases the curvature of the water flow in the soil, which makes the seepage in the unsaturated soil very slow and difficult to measure. And with the difference of void ratio and saturation, the permeability coefficient of unsaturated soil changes drastically. Due to the time-consuming and labor-intensive methods of experimentally measuring the permeability coefficient of unsaturated soil, researchers have proposed many indirect prediction models from the perspective ...

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Problems solved by technology

[0003] The purpose of the present invention is exactly to the deficiency of above-mentioned technology, provides a kind of saturated and unsaturated soil permeability coefficient prediction method based on nuclear magnetic resonance curve, overcomes the shortcoming that existing permeability coefficient prediction method is based on empirical method and prediction accuracy is low , to realize the prediction of the saturated soil permeability coefficient of any dry density soil sample and the unsaturated soil permeability coefficient of any water content by using nuclear magnetic resonance test

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