A method for determining the shear strength of calcareous sand under high stress

A shear strength and determination method technology, applied in the direction of applying stable shear force to test material strength, strength characteristics, instruments, etc., can solve the problem that calcareous sand particles are brittle and brittle, affect the shear strength of soil, and have no clear Instructions and other issues, to achieve the effect of saving manpower, easy to operate, and novel ideas

Active Publication Date: 2022-04-29
TIANJIN UNIV
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Problems solved by technology

[0006] However, due to the brittleness of calcareous sand particles, under the action of high vertical stress, the shear process will lead to a considerable number of particle breakage
Previous studies have shown that particle breakage can affect the shear strength of soils
However, there is currently no clear statement about this relationship

Method used

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  • A method for determining the shear strength of calcareous sand under high stress
  • A method for determining the shear strength of calcareous sand under high stress
  • A method for determining the shear strength of calcareous sand under high stress

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Embodiment

[0057] The present invention determines the shear strength method of calcareous sand under high stress, comprising the following steps:

[0058] 1) Carry out constant stress single shear tests at 1500KPa, 3000KPa and 5000KPa for quartz sand with different relative compactness. Among them, the layered filling method is used for sample loading, which is divided into 3 layers, and each layer is of the same height and quality;

[0059] 2) During the test, when the shear force tends to a stable value, it is considered that the tested quartz sand sample has been damaged. If the above situation does not occur, the test will be stopped when the shear displacement reaches 20%;

[0060] 3) According to the shear stress-shear strain relationship curve during the test, such as figure 1 As shown, the maximum internal friction angle of the above-mentioned quartz sand under the corresponding relative compactness and constant stress is calculated by the Coulomb formula

[0061] 4) Then ac...

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Abstract

The invention discloses a method for determining the shear strength of calcareous sand under high stress: taking calcareous sand and quartz sand with the same particle size distribution, and preparing samples with different relative densities; adopting layered filling, respectively carrying out 1500KPa , 3000KPa, 5000KPa constant stress single shear test; when the shear force tends to a stable value, it is considered that the soil sample has been sheared, otherwise, when the shear displacement reaches 20%, the test is stopped; the stress-strain relationship curve is drawn, and the Coulomb formula is used to calculate the sand The maximum internal friction angle of the soil; calculate the dilatation angle to obtain the maximum dilation angle of sand with different compactness; calculate the critical internal friction angle; use the Hardin method or Marsal method to obtain the sample breakage rate Br H or Br M ; The shear strength formula is obtained by fitting the unbroken quartz sand; the broken component is introduced into the calcareous sand strength formula, the broken component is calculated according to the coefficient determined by the quartz sand before, and the shear strength formula of the calcareous sand is obtained by fitting with the broken rate. Cut strength formula.

Description

technical field [0001] The invention relates to a method for determining shear strength, more particularly, to a method for determining shear strength of calcareous sand under high stress. Background technique [0002] Calcareous sand, as a special marine soil with high void ratio and fragility, has a certain influence on its strength. There is a large amount of calcareous sand in the South my country Sea. With the exploration and exploitation of offshore oil and natural gas resources and the development of tourism on islands and reefs in the past ten years, the number of modernization projects on islands and reefs and offshore is increasing, and the scale will also increase. Therefore, it is very important to study the shear strength characteristics of calcareous sand as the foundation, and the analysis of the relationship between the shear strength and shear dilatation of calcareous sand is the most important. [0003] The relationship expression between the shear strength...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N3/24
CPCG01N3/24G01N2203/0003G01N2203/0025G01N2203/0284G01N2203/0682
Inventor 李飒卢川尹蒋松刘小龙陈文玮
Owner TIANJIN UNIV
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