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Method for determining permeability radius of column hemisphere of rock-soil body tortuosity power law slurry time-varying property

A technique for determining the method and tortuosity, which is applied in the directions of permeability/surface area analysis, flow characteristics, direct current flow characteristics measurement, etc., can solve the problems of inability to reasonably and effectively determine the diffusion radius of column-hemispherical seepage grouting, unpublished results, Issues such as impact have not been considered, and the effect of achieving high practical value and promotion value, improving technical level, and avoiding waste

Active Publication Date: 2022-07-08
CHENGDU UNIVERSITY OF TECHNOLOGY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] According to engineering practice and theoretical research, the time-varying nature of power-law fluid and the tortuosity of porous media have a very important impact on the infiltration diffusion process and grouting effect; however, the above research results show that the current infiltration grouting mechanism has not yet considered The influence of the coupling effect of porous media tortuosity and time-varying power-law fluid on the infiltration diffusion process and grouting effect, even considering only the influence of power-law fluid time-varying and porous media tortuosity separately - hemispherical infiltration grouting of power-law fluid Mechanisms have not been published related results
It can be seen that the current infiltration grouting theory is difficult to meet the needs of grouting engineering practice, so it cannot reasonably and effectively determine the column-hemispherical infiltration grouting diffusion radius considering the coupling effect of porous media tortuosity and time-varying power-law cement slurry

Method used

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  • Method for determining permeability radius of column hemisphere of rock-soil body tortuosity power law slurry time-varying property
  • Method for determining permeability radius of column hemisphere of rock-soil body tortuosity power law slurry time-varying property
  • Method for determining permeability radius of column hemisphere of rock-soil body tortuosity power law slurry time-varying property

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Embodiment 1

[0046] like Figure 1 to Figure 7 As shown, this embodiment provides a method for determining the penetration radius of a column hemisphere with a time-varying power-law slurry of rock and soil tortuosity, which takes into account the coupling effect of the tortuosity of a porous medium and the time-varying power-law cement slurry. like Figure 2 to Figure 3 As shown, the grouting enters from the grouting pipe 1 into the side grouting hole 2 and the bottom grouting hole 3, and the groundwater pressure at the outer grouting point of the grouting area .

[0047] Specific steps are as follows:

[0048] 1) Obtaining the porosity of porous media by geotechnical tests =48.97%, permeability coefficient =0.0118 m / s, groundwater pressure at the grouting point = 0 Pa, and the tortuosity of porous media is selected according to the existing research results. =2.25, such as Figure 4 As shown, in the porous medium 4 and the pores 5, the actual osmotic diffusion flow path of th...

Embodiment 2

[0060] The present embodiment provides a method for determining the penetration radius of a column hemisphere with a time-varying power-law slurry of rock and soil tortuosity. The specific steps are as follows:

[0061] 1) Obtaining the porosity of porous media by geotechnical tests =44.19%, permeability coefficient =0.0083 m / s, groundwater pressure at the grouting point = 0 Pa, and the tortuosity of porous media is selected according to the existing research results. =2.25;

[0062] Porous Media Porosity The parameters are as follows: the density of the porous medium measured by the geotechnical test =1482kg / m 3 , density, mass, moisture content of porous media = 0.20%, specific gravity = 2.65.

[0063] 2) The initial consistency coefficient of the power-law cement slurry with a water-cement ratio of 0.60 was obtained by conducting rheological tests =4.6156Pa·s n , rheological index =0.2692, time-varying coefficient =0.0010 Viscosity with water =1.31×10...

Embodiment 3

[0069] The present embodiment provides a method for determining the penetration radius of a column hemisphere with a time-varying power-law slurry of rock and soil tortuosity. The specific steps are as follows:

[0070] 1) Obtaining the porosity of porous media by geotechnical tests =40.31%, permeability coefficient K=0.0055 m / s, groundwater pressure at grouting point = 0 Pa, and the tortuosity of porous media is selected according to the existing research results. =2.25;

[0071] Porous Media Porosity The middle parameters are as follows: The density of porous media measured by the rock and soil test is P=1585 kg / m 3 , density, mass, moisture content of porous media = 0.20%, specific gravity = 2.65.

[0072] 2) The initial consistency coefficient of the power-law cement slurry with a water-cement ratio of 0.70 was obtained by the rheological test =1.9321Pa·s n , rheological index =0.4537, the time-varying coefficient k=0.0009 and the viscosity of water =1.31×1...

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Abstract

The invention discloses a rock-soil body tortuosity power-law slurry time-varying cylindrical hemisphere permeability radius determination method, which comprises the following steps: obtaining the porosity of a porous medium and a corresponding permeability coefficient by utilizing a rock-soil body test, measuring to obtain underground water pressure at a grouting point, and determining the tortuosity of the porous medium; obtaining an initial consistency coefficient, a rheological index and a time-varying coefficient of the power-law cement slurry with the designed water-cement ratio by using a rheological test, and determining the viscosity of water; grouting parameters are obtained, wherein the grouting parameters comprise grouting pressure, grouting time, the number of grouting holes in the side face of a grouting pipe and the radius of the grouting holes; and solving the diffusion radius of the column-hemisphere permeation grouting considering the tortuosity of the porous medium and the time-varying coupling effect of the power-law cement grout. Through the scheme, the method has the advantages of simple logic, accuracy, reliability and the like.

Description

technical field [0001] The invention relates to the technical field of environmental protection and ecological restoration, in particular to a method for determining the penetration radius of a column hemisphere with a time-varying power-law slurry of rock and soil tortuosity. Background technique [0002] The osmotic grouting of grouting fluid in porous media can show three diffusion forms: spherical, cylindrical and cylindrical-hemispherical. According to different rheological constitutive equations, the grouting fluid can be divided into Newtonian fluid, Bingham fluid and There are three types of power-law fluids. The pores of porous media are tortuously distributed, so the infiltration and diffusion channel of the slurry in it is not a straight path, but has a typical tortuous effect; at the same time, the rheological parameters of the cement slurry are not constant, but will change with time. It has a typical time-varying effect. If the tortuosity effect (ie tortuosity...

Claims

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Application Information

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IPC IPC(8): G01N13/04G01N15/08G01N11/04G01N11/14
CPCG01N13/04G01N15/082G01N15/088G01N11/04G01N11/14G01N2013/003G01N33/383G01N33/246G01N33/24G01N15/0893
Inventor 杨志全刘昱清朱颖彦王向鹏杨溢叶长文陈茂李小辉张碧华杨太强林凡强
Owner CHENGDU UNIVERSITY OF TECHNOLOGY
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