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A method for determining the permeability of loose granular materials based on numerical results mining

A kind of granular material and loose technology, which is applied in mining and offshore engineering, can solve problems that affect the reliability of large deformation consolidation theory, unreasonable engineering design, and difficulty in permeability coefficient, so as to facilitate program processing, understanding and calculation, The effect of ease of experimental design

Active Publication Date: 2021-10-01
SICHUAN UNIV
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Problems solved by technology

However, it is extremely difficult to determine the permeability coefficient under high void ratio by experiment, and the experimental equipment is special and expensive (for example, using X-ray to measure the distribution of void ratio with space during the consolidation experiment)
Another method to determine the permeability coefficient is the engineering material analogy method based on statistical analysis. This method has low precision at high void ratios, which seriously affects the reliability of the large deformation consolidation theory, resulting in unreasonable engineering design.

Method used

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  • A method for determining the permeability of loose granular materials based on numerical results mining
  • A method for determining the permeability of loose granular materials based on numerical results mining
  • A method for determining the permeability of loose granular materials based on numerical results mining

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Embodiment Construction

[0023] Step 1. Acquire settlement test data from one-dimensional deposition-consolidation (or similar type) tests, H i t after the start of the experiment i Time (i=1,2,...,n) the distance from the highest point of the sediment particle to the bottom of the specimen, that is, the height of the water-sand interface, and then H i and t i drawn on H i -lg t i Coordinate System.

[0024] Step 2. Select the constant P 1 and P 2 Large strain settlement and consolidation coupling (large strainsedimentation-consolidation, LSSC) analysis is carried out to obtain the settlement curve, that is, the relationship curve between settlement and lg(time), referred to as the predicted settlement curve (predicted settlement curve, PSC). The predicted sedimentation curve (PSC) has the following properties in the time logarithmic coordinate (lg t): the shape of the PSC is determined by the value of the constant P, when the constant M changes, the PSC shifts, figure 1 A schematic illustratio...

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Abstract

The invention discloses a method for determining the permeability of loose granular materials based on numerical results mining. The steps are as follows: obtain settlement data from a large-deformation one-dimensional settlement consolidation test, formulate two constants P, conduct large-deformation settlement and consolidation coupling analysis to obtain a prediction Settlement curve, change the constant M to make the predicted settlement curve move in the logarithmic coordinate of time to pass the test point, solve the intersection point of the line segment connected by two pairs of constants M and P under all test points in the P-lgM plane, and directly calculate the intersection point The arithmetic mean of the coordinates or the linear regression equation of the proposed intersection point and solve the constants M and P simultaneously with the initial conditions of the test to obtain the functional equation k(e)=Me of the permeability coefficient k and porosity e P . The method of the invention can predict the permeability of the loose granular material simply, quickly and accurately, the experiment design is simple and economical, the feasibility is strong, the data is easy to obtain, and the popularization value is high.

Description

technical field [0001] The invention relates to the fields of geotechnical engineering, mining, offshore engineering, water conservancy engineering, and disaster prevention and mitigation engineering, and in particular to a method for determining the change of permeability of loose granular materials with void ratio or dry density. Background technique [0002] The permeability coefficient k of the loose granular material changes with the change of the void ratio e during the consolidation process, and the relationship between the two can be expressed by the function k(e)=Me P Characterized, this change trend k(e)=Me P It is an important parameter to analyze and calculate the sedimentation and consolidation process of loose granular materials by using the large deformation consolidation theory. However, it is extremely difficult to determine the permeability coefficient under high void ratio by experiment, and the experimental equipment is special and expensive (for example...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F17/11G06F17/18G06Q10/04G01N15/08
CPCG01N15/08G06F17/11G06F17/18G06Q10/04
Inventor 戚顺超陈宣全周家文杨兴国范刚鲁功达姚强
Owner SICHUAN UNIV
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