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Rapid detection and evaluation method for light soil roadbed

An evaluation method and soil subgrade technology, which can be applied in the field of foundation soil survey, foundation structure engineering, construction, etc., can solve the problems of lack of detection and evaluation methods for the quality of deep subgrade pouring

Active Publication Date: 2020-04-21
HOHAI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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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  • Rapid detection and evaluation method for light soil roadbed
  • Rapid detection and evaluation method for light soil roadbed
  • Rapid detection and evaluation method for light soil roadbed

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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 rapid detection and evaluation method for a light soil roadbed. The method comprises the steps of firstly arranging sound detection pipes at variable intervals in the roadbedaccording to field conditions of the light soil roadbed, and selecting an optimal detection interval; determining the arrangement group number of the sound detection pipes, then arranging the sound detection pipes in the roadbed at the optimal detection interval according to the section form of the roadbed, and acquiring ultrasonic detection data of each layer of roadbed; performing sampling on the uppermost layer of roadbed, testing the unconfined compressive strength of the uppermost layer of roadbed, observing whether cracks exist in the uppermost layer roadbed through a sampling groove left after physical sampling, and accordingly building a corresponding relationship between pouring quality of the uppermost layer of roadbed and an ultrasonic detection result; and finally, judging thepouring quality. A detection means is provided for the layered-pouring light soil roadbed, and the method is suitable for roadbeds or structures which are 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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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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