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Unsaturated soil nonlinear strength enveloping shell model

A nonlinear and enveloping shell technology, applied in the field of soil mechanics, can solve problems such as calculation errors of soil shear strength, and achieve good application prospects and promotional value

Inactive Publication Date: 2017-08-01
CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Application Information

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Problems solved by technology

In this way, the application of Fredlund's plane model is limited to a certain extent, and the calculation of the corresponding soil shear strength will also have large errors

Method used

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  • Unsaturated soil nonlinear strength enveloping shell model
  • Unsaturated soil nonlinear strength enveloping shell model
  • Unsaturated soil nonlinear strength enveloping shell model

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Embodiment Construction

[0012] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments It is a part of embodiments of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0013] like figure 1 As shown, the three coordinate axes in the stress space represent: the effective normal stress (σ-u a ) axis (1), matrix suction (u a -u w ) axis (2) and shear stress τ axis (3), where σ is the normal stress, u a is the pore gas pressure, u w is the pore water pressure. The nonlinear strength envelope (4) falls with...

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Abstract

The invention relates to an unsaturated soil nonlinear strength enveloping shell model and belongs to the technical field of soil mechanics. At present, a shearing strength model widely applied in the unsaturated soil mechanics field is an Mohr-Coulomb destruction enveloping surface (plane) model proposed by Fredlund, but an application range of the plane model is relatively small, and a calculation error of corresponding soil body shearing strength is relatively large. The unsaturated soil nonlinear strength enveloping shell model has the key points of the technical scheme that an intersecting line of an enveloping shell (4) and a plane where a tau axis (3) and a (sigma-ua) axis locate satisfies a relationship expression: tau=c0[1+(sigma-ua) / sigma*t]1 / m, wherein c0 is soil body initial cohesive force, sigma*t is soil body tensile strength, and m is a parameter of a control strength envelope curvature. A projection of an arbitrary curve, parallel to a plane where a tau axis (3) and a (ua-uw) axis (2) locate, on the enveloping shell (4) on the plane satisfies the following relationship expresssion which is described in the description. The unsaturated soil nonlinear strength enveloping shell model can be used for more accurately calculating the soil body shearing strength.

Description

technical field [0001] The invention relates to the field of soil mechanics, and proposes a nonlinear strength envelope model of unsaturated soil. Background technique [0002] At present, the shear strength model widely used in the field of unsaturated soil mechanics is the Mohr-Coulomb failure envelope (plane) model proposed by Fredlund. More and more studies have shown that when the matric suction is smaller than the air intake value, the matric suction-related friction horn and effective internal friction angle Roughly equal; but when the matrix suction increases gradually, will decrease non-linearly. In this way, the application of Fredlund's plane model is limited to a certain extent, and the calculation of the corresponding soil shear strength will also have large errors. Contents of the invention [0003] In order to solve the above technical problems, the present invention provides a nonlinear strength envelope model of unsaturated soil, which can calculate...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N33/24
CPCG01N33/24
Inventor 方薇
Owner CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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