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A rapid detection and evaluation method for light soil subgrade

An evaluation method and technology for soil subgrade, which are applied in the field of foundation soil survey, infrastructure engineering, construction, etc., can solve the problem of lack of detection and evaluation methods for the pouring quality of deep subgrade, and achieve the effect of rapid detection and evaluation.

Active Publication Date: 2021-05-11
HOHAI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The present invention aims at the defects in the above-mentioned background technology, provides a quick detection and evaluation method of light soil roadbed, and solves the technical problem that the pouring quality of the existing deep roadbed still lacks effective detection and evaluation methods

Method used

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  • A rapid detection and evaluation method for light soil subgrade
  • A rapid detection and evaluation method for light soil subgrade
  • A rapid detection and evaluation method for light soil subgrade

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Embodiment

[0135] A road project uses light soil as the subgrade filling material, the design compressive strength is ≥1.2MPa, and the subgrade filling height is 1.2m. The single filling area of ​​the light soil subgrade is 20.0×16.0m, the single filling height is 0.4m, and the subgrade is poured in three layers: lower, middle and upper. The construction mix ratio of light soil is shown in the table below.

[0136]

[0137] Note: Conch brand PO42.5 ordinary Portland cement is used for cement, HTW-1 composite foaming agent is used as foaming agent, and the dilution ratio of foaming agent is 1:50.

[0138] First, determine the optimal detection distance L b : The light soil roadbed belongs to the strip roadbed, in order to determine the best detection distance L b , On one side of the subgrade test section, acoustic tubes with spacings of 0.4-1.0m, 1.2m, 1.5m and 2.0m are buried linearly, and three groups of parallel tests are set up. According to the test results, when the detection...

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Abstract

The invention discloses a quick detection and evaluation method for a light soil subgrade. Firstly, according to the field conditions of the light soil subgrade, acoustic measuring tubes are arranged at variable intervals in the subgrade, and an optimal detection interval is selected; Then, based on the section form of the subgrade, lay acoustic tubes in the subgrade with optimal detection intervals to obtain ultrasonic testing data of each layer of subgrade; then take samples from the uppermost subgrade to test its unconfined compressive strength, and through physical The sampling slot left after sampling is used to observe whether there are cracks in the uppermost subgrade, so as to establish the corresponding relationship between the pouring quality of the uppermost subgrade and the results of ultrasonic testing; and finally judge the pouring quality. The invention provides a detection method for the layered pouring light soil roadbed, and is suitable for the roadbed or structure that is inconvenient to directly detect inside due to layered pouring or block pouring.

Description

technical field [0001] The invention discloses a quick detection and evaluation method for light soil roadbed, and relates to the technical field of civil engineering quality detection. Background technique [0002] During the pouring process of light soil subgrade, affected by the construction quality and construction conditions, defoaming and grout leakage may occur, which will reduce the quality of the subgrade and affect the mechanical and engineering properties of the subgrade to varying degrees. Moreover, during the maintenance process of the roadbed, due to uneven internal stress and excessive temperature, defects such as cracks may exist inside the roadbed. [0003] When inspecting and accepting light soil subgrades poured in layers in engineering, the compressive strength of the subgrade surface and the presence or absence of cracks and other defects are usually used as the acceptance criteria. There is still a lack of effective detection and evaluation methods for ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E02D1/00
CPCE02D1/00
Inventor 刘鑫孙东宁张立业邵志伟史云强洪宝宁
Owner HOHAI UNIV
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