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Method for measuring porosity in piping development process

A technology of development process and porosity, applied in the direction of measurement device, permeability/surface area analysis, suspension and porous material analysis, etc., can solve the problem of not being able to accurately measure piping and restrict the in-depth study of piping development mechanism, etc., to achieve The effect of deepening understanding

Inactive Publication Date: 2012-07-25
HOHAI UNIV
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

However, due to the limitations of the inventor's research, the inventor has not been able to accurately grasp the method of measuring the porosity during the piping development process, thus restricting the in-depth research on the piping development mechanism

Method used

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  • Method for measuring porosity in piping development process
  • Method for measuring porosity in piping development process
  • Method for measuring porosity in piping development process

Examples

Experimental program
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Embodiment

[0022] Embodiment: the present invention utilizes as figure 1 The shown seepage-erosion stress-coupled piping test device is used to measure the porosity of soil during the development of piping.

[0023] The test method of seepage erosion stress coupled piping test device, the steps are as follows:

[0024] (1) Preparation and installation of samples. First, according to the requirements of dry density and water content, a special split mold is used to prepare the sample, and the outer surface of the sample is tightly wrapped with a heat-shrinkable tube. Secondly, place a porous steel plate with a diameter of 2mm on the base (the porous steel plate is mainly used to separate coarse and fine materials, this test assumes that the particle size of the movable fine particles is less than 2mm, that is, in the test, only fine particles with a particle size of less than 2mm can flow out of the test sample), fix the sample on the base of the instrument, and tighten the screws. Fin...

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Abstract

The invention discloses a method for measuring porosity in a piping development process. The porosity at a certain moment in the piping development process is determined by testing parameters such as initial porosity, volumetric strain and fine granule loss. By utilizing the method for measuring the porosity in the piping development process, the old problem that the soil mass porosity evolution process in the piping development process cannot be determined can be solved, and an important theoretical basis is provided for establishing a mathematical model for forecasting the piping occurrence and development process.

Description

technical field [0001] The invention relates to a method for measuring the porosity in the piping development process. Background technique [0002] Piping is a very important form of dam seepage failure, and its development process involves many complex mechanical behaviors such as pore water seepage, movable fine particle erosion migration, porous medium deformation, etc., and is accompanied by continuous changes in porosity. Determining the porosity of the soil at any time during the piping development process is the key to accurately predicting the piping development process. It has very important theoretical and practical significance for comprehensively and objectively understanding the piping mechanism and correctly predicting the piping development process. [0003] However, due to the concealment of the piping development process, there is no report on the porosity change law in the piping development process, and the porosity models commonly used in the seepage str...

Claims

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Application Information

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IPC IPC(8): G01N15/08
Inventor 罗玉龙詹美礼盛金昌速宝玉何淑媛
Owner HOHAI UNIV
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