Method for testing ultrasonic wave velocity of frozen soil under axial pressure

A test method and ultrasonic technology, which is applied in the analysis of solids using sonic/ultrasonic/infrasonic waves, can solve problems such as incompatibility of insulating materials and sample damage, and achieve the effect of high accuracy and simple operation.

Inactive Publication Date: 2014-07-02
COLD & ARID REGIONS ENVIRONMENTAL & ENG RES INST CHINESE
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Problems solved by technology

Among them, the deformation modulus method and the density change measurement method will cause certain damage to the sample during the test.
Although the resistivity change method will not cause damage to the sample, it is not suitable for some insulating materials.

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  • Method for testing ultrasonic wave velocity of frozen soil under axial pressure
  • Method for testing ultrasonic wave velocity of frozen soil under axial pressure
  • Method for testing ultrasonic wave velocity of frozen soil under axial pressure

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Embodiment Construction

[0028] Below in conjunction with accompanying drawing, technical scheme of the present invention is described further:

[0029] Sample 9 of the present invention adopts the silt soil taken from the Beilu River Railway Test Section of the Qinghai-Tibet Plateau; the liquid limit is 24%, the plastic limit is 15.6%, and the plasticity index is 8.4; the optimum water content is 16%, and the maximum dry density is 1.76g / cm 3 ; Among them, the soil particles with a particle size of 0.1~0.05mm accounted for 30.39% of the total soil, the soil particles with a particle size of 0.05~0.01mm accounted for 58.29% of the total soil, and the soil particles with a particle size of 0.01~0.005mm accounted for 10% of the total soil. 4.32%, and soil particles with a particle size of less than 0.005mm accounted for 6.99% of the total soil mass. The specific operation steps are as follows:

[0030] (1) In order to compare with the actual project, the test adopts the optimal moisture content of 16...

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Abstract

The invention discloses a method for testing the ultrasonic wave velocity of frozen soil under axial pressure. The method comprises the following steps: manufacturing a frozen soil sample; preparing testing equipment; testing the ultrasonic wave velocity of the frozen soil sample under axial pressure; and analyzing the change conditions of the wave velocity of the frozen soil sample under the axial pressure. According to the method for testing the ultrasonic wave velocity of the frozen soil under axial pressure provided by the invention, the damage characteristics in the frozen soil loading process are detected, and the change characteristics of acoustic wave propagation of the frozen soil in the loading process have important guiding significance for predicting the dynamic change of cracks in cold frozen soil engineering and evaluating the stability in China.

Description

technical field [0001] The invention relates to a method for testing ultrasonic wave velocity of frozen soil under uniaxial pressure. Background technique [0002] Permafrost is widely distributed all over the world. my country is the third largest country with permafrost after Russia and Canada. The distribution area of ​​permafrost accounts for about 22.3% of my country's land area. These areas are rich in resources such as mineral deposits, fresh water, and wild animals and plants. Their existence and evolution have an important impact on the living environment, production and lifestyle of human beings, and the sustainable development of human society. With the successive completion of the Qinghai-Tibet Highway and the Qinghai-Tibet Railway, the development of the cold region has been accelerating, and the Qinghai-Tibet area is also widely distributed with transmission line pile foundations, electric towers and other projects. The areas where these projects are located h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N29/07
Inventor 黄星李东庆明锋邴慧杜玉霞彭万巍
Owner COLD & ARID REGIONS ENVIRONMENTAL & ENG RES INST CHINESE
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