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Method for establishing unified strength theory of unsaturated soil

A technology of strength theory and construction method, which is applied in the field of construction of unified strength theory, can solve the problems of not considering matrix suction, lack of interpretation of theoretical basic mechanical model, and unverified true triaxial test of unsaturated soil.

Inactive Publication Date: 2014-10-08
CHANGAN UNIV
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Problems solved by technology

The double-shear element model and unified strength theory proposed by Yu Maohong have extensive theoretical significance, but they are not suitable for unsaturated soils because they do not consider the influence of matric suction.
The author combines Yu Maohong's unified strength theory with Fredlund's dual stress state variables, and uses the analogy method to establish a unified solution for the shear strength of unsaturated soil, but lacks a solid theoretical foundation and a reasonable mechanical model explanation, and has not gone through The true triaxial test verification of

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  • Method for establishing unified strength theory of unsaturated soil
  • Method for establishing unified strength theory of unsaturated soil
  • Method for establishing unified strength theory of unsaturated soil

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[0048] In order to make the objects and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the examples. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0049] The embodiment of the present invention provides a method for constructing the unified strength theory of unsaturated soil, including the following steps:

[0050] S1, such as figure 1 As shown, a double-shear element model suitable for unsaturated soil under a three-dimensional compressive stress state is constructed;

[0051] S2. Assume that when the two large shear stresses acting on the double-shear unit model obtained in step S1 and the influence function of the normal stress on the surface reach a certain limit value, the unsaturated soil double-shear unit begins to yield or fail ; matrix suction (u a -u w ) caused by the adsorp...

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Abstract

The invention discloses a method for establishing a unified strength theory of unsaturated soil. According to the double-stress state variable theory and the absorption strength characteristic of the unsaturated soil, a double-shear element model suitable for the unsaturated soil is established, then the unified strength theory of the unsaturated soil under a complex stress state is established, the characteristics of the particular case, the plane limit line and the space limit face of the unified strength theory are analyzed, the document rigidity and flexibility true triaxial test of unsaturated sand is used for verification. The method for establishing the unified strength theory of the unsaturated soil completes and enriches the basic theory of the unsaturated soil, and has important theoretical significance and engineering application value.

Description

technical field [0001] The invention relates to a construction method of a unified strength theory of unsaturated soil. Background technique [0002] Most geotechnical problems involve the strength of soil, and the study of the strength of unsaturated soil is the primary issue of unsaturated soil theory and its engineering application. In engineering practice, most unsaturated soils are under complex stresses. The existing rigid, flexible and rigid-flexible composite true triaxial tests on unsaturated soils show that the intermediate principal stress has a significant impact on the strength of unsaturated soils, but the existing Most of the unsaturated soil strength formulas are obtained by extending the Mohr-Coulomb (M-C) strength criterion of saturated soils without considering the influence of the intermediate principal stress. The representative ones are: Bishop effective stress type strength formula, Fredlund double stress state variable type strength formula or None o...

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Application Information

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IPC IPC(8): G06F19/00
Inventor 张常光赵均海范文朱倩孙珊珊张冬芳
Owner CHANGAN UNIV
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