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Method for predicting stability angle of offshore underwater high-pressure diluted sludge hole

A prediction method and a technology of stable angle, applied in the field of infrastructure construction, can solve problems such as fish death, and achieve the effects of reliable results, strong process flow and convenient use.

Active Publication Date: 2021-03-02
HUAQIAO UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this law has higher requirements on the surrounding environment, such as causing greater impact on marine fish and surrounding residents, and in severe cases may lead to the death of fish, etc.

Method used

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  • Method for predicting stability angle of offshore underwater high-pressure diluted sludge hole
  • Method for predicting stability angle of offshore underwater high-pressure diluted sludge hole
  • Method for predicting stability angle of offshore underwater high-pressure diluted sludge hole

Examples

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Effect test

Embodiment 1

[0058]In an offshore bay in Fujian Province, the method of the invention was used to predict the stability angle of underwater high-pressure dilution silt holes. A typical silt undisturbed soil sample was taken from the silt foundation under seawater, sealed, and transported back to the geotechnical laboratory for non-solidification. Fast shear test to determine that the cohesive force c of the silt is 8kPa, and the internal friction angleIt is 7°; Use the remaining undisturbed soil sample mentioned above, use the ring knife method to carry out the density test, use the ring knife to test its volume, use a balance to weigh its mass, divide the mass by the volume to get its density, and then multiply it by the acceleration of gravity The weight γ is 16.5kN / m3;According to the design depth of sludge treatment in offshore waters, the depth H of the silt hole is determined to be 8m; according to experience, ρ1=1.20g / cm3; Using Matlab software, the angle α starts from 0.1° and takes the ...

Embodiment 2

[0060]A stone-filled breakwater was built in an offshore silt foundation in Fujian Province. The method of the invention was used to predict the stability angle of underwater high-pressure dilution silt holes. A typical undisturbed soil sample of the silt was taken from the offshore silt foundation, sealed and transported back. The geotechnical laboratory conducted an unconsolidated quick shear test and determined that the cohesive force c of the silt was 9kPa, and the internal friction angleIt is 6°; using the remaining undisturbed soil sample mentioned above, use the ring knife method to carry out the density test, use the ring knife to test its volume, use a balance to weigh its mass, divide the mass by the volume to get its density, and then multiply it by the acceleration of gravity The weight γ is 16.6kN / m3;According to the design depth of silt treatment in offshore water, the depth H of the silt hole is determined to be 12m; according to experience, ρ1=1.20g / cm3; Using Matlab...

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Abstract

The invention provides a method for predicting a stability angle of an offshore underwater high-pressure diluted sludge hole. The method comprises the following steps: 1) determining cohesive force cand an internal friction angle of sludge; 2) determining a weight gamma of underwater sludge; 3) determining the depth H of the high-pressure diluted sludge hole; 4) determining the density rho1 of the slurry in the high-pressure diluted sludge hole; 5) incrementally valuing the angle alpha from 0.1 degree with 0.1 degree until the value reaches 89.9 degrees to form an angle sequence; 6) determining the weight G of an underwater unstable body within the unit width; 7) determining the pressure P generated by the sludge hole slurry on the hole wall within the unit width; 8) determining the resistance R of the underwater unstable body within the unit width; 9) determining the instability force T of the underwater unstable body in the unit width; and 10) drawing a curve B and a curve C by using Matlab software and taking the sequence a as an abscissa and the sequence r and the sequence t as an ordinate.

Description

Technical field[0001]The present invention relates to the field of infrastructure construction, in particular to a method for predicting the stability angle of high-pressure dilution silt pores in offshore waters.Background technique[0002]In the process of offshore infrastructure construction, soft foundations such as silt are often encountered. At this time, the explosive squeezing of silt-filling method is a relatively economical and fast method. The law has higher requirements on the surrounding environment, such as causing greater impact on marine fish and surrounding residents, and severe cases may lead to fish death. At this time, the use of high-pressure water to dilute the sludge to make holes, and then fill the holes with rocks, is a construction method that can replace the explosion and squeeze the silt when the surrounding environment is demanding. When high pressure water is used to dilute the silt hole, the self-standing angle of the silt hole wall is the stable angle, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N13/00G01N9/36G01N3/24G01N19/04G06Q10/04
CPCG01N13/00G01N9/36G01N3/24G01N19/04G06Q10/04G01N2203/0003G01N2203/0025
Inventor 常方强耿鹏黄建生霍宁耿耿
Owner HUAQIAO UNIVERSITY
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