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Method for quickly judging whether unsaturated soil is damaged or not after being under stress

A rapid and soil-based technology, applied in the field of geotechnical engineering, can solve problems such as difficult measurement of pore water pressure, and achieve the effects of easy operation, accurate testing and high efficiency

Active Publication Date: 2019-01-15
NORTH CHINA UNIV OF WATER RESOURCES & ELECTRIC POWER
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Problems solved by technology

At present, the commonly used formulas for calculating the strength of unsaturated soil contain variable pore air pressure and pore water pressure, but the pore air pressure and pore water pressure are not easy to measure, and the commonly used formulas cannot directly judge whether the soil is destroy

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  • Method for quickly judging whether unsaturated soil is damaged or not after being under stress
  • Method for quickly judging whether unsaturated soil is damaged or not after being under stress
  • Method for quickly judging whether unsaturated soil is damaged or not after being under stress

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Embodiment Construction

[0024] The specific implementation of the present invention will be described in detail below in conjunction with the accompanying drawings and specific conditions.

[0025] Depend on figure 1 As shown, the present invention is in concrete implementation, and a kind of method for quickly judging whether unsaturated soil is damaged after being stressed comprises the following steps:

[0026] 1. First determine the limit equilibrium condition of unsaturated soil, the method is:

[0027] according to figure 1 As shown, when the soil is subjected to load σ 1 , σ 3 When the action is in the critical failure limit state, the stress in the soil at this time is: cohesion c', pore water pressure u in the pore water body w , the gas pressure u in the pores a , the difference between the two (u a -u w ) is called matrix suction S c , and the surface of the soil with the large principal stress (that is, with the large principal stress σ 1 The normal total stress σ and the shear s...

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Abstract

The invention relates to a method for quickly judging whether unsaturated soil is damaged or not after being under stress, which can quickly, accurately and effectively judge whether the unsaturated soil is damaged or not after being under stress so as to ensure engineering quality. The method comprises the following steps: determining parameters of residual water content theta<irr> and saturatedwater content theta<sat>, as well as parameters b and d related to soil properties by a pressure plate instrument; measuring parameters of total stress strength indexes c and phi by a conventional triaxial apparatus; measuring a parameter phi by an unsaturated direct shear apparatus; measuring the water content theta of a soil body, and measuring actual small principal stress sigma<3> and actual large principal stress sigma<z> on the soil body when the soil body is under stress by "soil mechanics"; and substituting the small principal stress sigma<3> on the soil body into a formula, solvingtheoretical large principal stress sigma<1> of the soil body in a critical failure limit state, and judging whether the soil body is damaged or not according to whether sigma<1> is larger than the large principal stress sigma<z> on the soil body. The method is simple, easy to operate, accurate in testing, high in efficiency and easy to popularize and apply, and provides technical support for construction.

Description

technical field [0001] The invention relates to geotechnical engineering, in particular to a method for quickly judging whether unsaturated soil is damaged after being stressed. Background technique [0002] In construction, it is essential to understand the force of rock and soil. The soil in nature is composed of soil particles accumulated to form a soil skeleton. If the pores in the soil skeleton are filled with water, the soil is called saturated soil; filled, it is called unsaturated soil. [0003] Soil strength is a key factor determining the stability of a project. At present, the commonly used formulas for calculating the strength of unsaturated soil contain variable pore air pressure and pore water pressure, but the pore air pressure and pore water pressure are not easy to measure, and the commonly used formulas cannot directly judge whether the soil is destroy. Therefore, how to quickly and effectively judge whether the unsaturated soil is damaged after being st...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N3/24
CPCG01N3/24G01N2203/0025
Inventor 黄志全贾景超何鹏毕庆涛李幻吴岱諠
Owner NORTH CHINA UNIV OF WATER RESOURCES & ELECTRIC POWER
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