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Nondestructive testing method for bubble mixed light soil embankment

A non-destructive testing, lightweight soil technology, applied to the use of sound waves/ultrasonic waves/infrasonic waves to analyze solids, instruments, and analysis materials, etc., it can solve problems such as attenuation, physical and mechanical performance degradation, and unfavorable embankment stability. Simple operation and remarkable economic benefits

Active Publication Date: 2018-04-03
HOHAI UNIV +1
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  • Claims
  • Application Information

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Problems solved by technology

However, unlike the traditional embankment filling soil, the engineering performance of the air-bubble mixed lightweight soil gradually decays over time. This is because the physical and mechanical properties of cement products continue to decrease over time, which is not conducive to the stability of the embankment. for the sake of

Method used

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  • Nondestructive testing method for bubble mixed light soil embankment
  • Nondestructive testing method for bubble mixed light soil embankment
  • Nondestructive testing method for bubble mixed light soil embankment

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Effect test

Embodiment 1

[0038] A kind of air bubble mixed light soil embankment field non-destructive testing method of the present invention, it comprises the following steps:

[0039] Check point layout. Such as figure 1 with figure 2 As shown, the air bubble mixed light soil embankment 6 is installed on the embankment before pouring. Acoustic tubes should be installed along the vertical section of the future operating road with the largest traffic flow, and a group should be installed every 50-100m. Each group of measuring points contains two acoustic tubes 4, and the maximum distance between the acoustic tubes shall not exceed 50cm. The acoustic tube should be inserted into the soil layer 7 at the bottom of the embankment for more than 20cm, and filled with cement mortar 8 to the bottom of the light soil embankment. When installing the acoustic tube 4 upwards, install three metal acoustic tube brackets 5 outside each acoustic tube 4 to maintain its verticality and stability, so as not to cau...

Embodiment 2

[0047] For a foam light soil road of an expressway, in order to sample the quality of its pouring, an inspection point was set at the exit of a ramp. The design thickness of the light soil embankment at the test point is 1.75m, and the temperature of the day is 35°, and the water content is 15%. The method of the present invention is used to carry out sampling inspection on the air bubble mixed light soil embankment. The construction mix ratio of air bubble mixed light soil embankment to be tested is: cement: water: air bubble group = 350(g): 215(g): 672.1(L). After the pavement is completed, the measuring point is drilled to bury the acoustic tube. The distance between the two acoustic tubes at the site is 50cm. The test is performed every 10cm within the range of 1.75m. A total of 17 test sections are obtained. Ultrasonic velocity of light soil embankment, see the table below.

[0048] The measured value of ultrasonic wave velocity of air bubble mixed light soil embankment ...

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Abstract

The invention relates to a nondestructive testing method for a bubble mixed light soil embankment and belongs to the field of testing of the embankment. The nondestructive testing method comprises thefollowing steps: (1) arranging a testing point; (2) acquiring an ultrasonic signal; (3) correcting data on site; (4) inversely analyzing an acoustic parameter; and (5) judging the quality of the embankment. The simple practical method is provided to test the quality of the bubble mixed light soil embankment, and also has a very strong reference effect on the testing of the quality of other embankments.

Description

technical field [0001] The invention belongs to the field of embankment detection, and in particular relates to an on-site non-destructive detection method for air bubble mixed light soil embankment, and more specifically relates to a comprehensive quality determination method for air bubble mixed light soil embankment based on the acoustic wave transmission method. Background technique [0002] As a new type of geotechnical material, air-bubble mixed light soil has been widely used in the filling of special soft foundation road sections such as bridge head transition sections, road sections with structures, and deep soft soil sections. Due to its good properties, air-bubble mixed light soil has many advantages as embankment filler, and it has been proved in practice. However, unlike the traditional embankment filling soil, the engineering performance of the air-bubble mixed lightweight soil gradually decays over time. This is because the physical and mechanical properties o...

Claims

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Application Information

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IPC IPC(8): G01N29/04G01N29/07
CPCG01N29/04G01N29/07G01N2291/023
Inventor 刘鑫濮仕坤盛柯洪宝宁李之隆单浩徐奋强
Owner HOHAI UNIV
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