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Method for detecting compacting quality of roadbed

A detection method and compaction quality technology, applied in the direction of material inspection products, etc., can solve the problems of inability to quickly and accurately evaluate the project quality, high detection cost, and affect the construction progress, so as to improve the efficiency of detection work, ensure the quality of the project, The effect of improving the service life

Inactive Publication Date: 2009-10-14
JIANGSU TRANSPORTATION RES INST CO LTD
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Problems solved by technology

[0003] At present, testing methods such as sand filling method and ring knife method are often used in domestic highway subgrade compaction quality inspection. It is difficult to keep up with the speed of road construction and affect the construction progress if the project quality is comprehensively, quickly and accurately evaluated

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  • Method for detecting compacting quality of roadbed
  • Method for detecting compacting quality of roadbed
  • Method for detecting compacting quality of roadbed

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Embodiment Construction

[0034] Further description will be given below in conjunction with the examples.

[0035] The method for detecting the quality of subgrade compaction comprises the following steps:

[0036] step 1

[0037] The earthwork subgrade shall be filled and compacted in layers according to the designed section, and the compacted thickness of the layers shall not exceed 20cm;

[0038] After the compaction of each layer of filling is completed, random inspection shall be carried out, and the inspection frequency shall be every 2000m 2 Inspect 8 points, and measure the penetration rate PR (unit: mm / hammering time, usually take the value of one hammering) at the inspection point by standard penetration with Dynamic Cone Penetrometer (DCP).

[0039] The detection method of penetration rate PR is:

[0040] ①Select the point to be tested, and move the DCP to the test site for testing;

[0041] ②Put the sliding rod vertically on the ground, and put the ruler parallel to the sliding rod;

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Abstract

The invention relates to a method for detecting the compacting quality of a roadbed, aiming at providing a method which has the advantages of simple operation and short detecting period. The technical scheme for achieving the aim of the invention is as follows: the method for detecting the compacting quality of the roadbed comprises the following steps: 1. by the standard penetration of a dynamic cone penetrometer (DCP) at a detecting point, the DCP-detected penetration rate PR (unit mm / hammering time, generally taking a hammering value at one time) of earthwork roadbed section is detected layer by layer; 2. according to the DCP-detected penetration rate PR of a single detecting point, the weighted average of the filling penetration rate NPR of each layer at the detecting point is counted so as to obtain a CBR value or a rebound modulus E; and 3. according to the CBR value or the rebound modulus, the bearing capacity of the roadbed at different depths and the whole bearing capacity are judged.

Description

technical field [0001] The invention relates to a detection method in the field of road engineering, in particular to a detection method for roadbed compaction quality. Background technique [0002] The subgrade is the basic structure of the road, and it is the basis for supporting the pavement structure. It bears the driving load together with the pavement, and at the same time bears the erosion and impact of climate change and various natural disasters. The traffic load is transmitted to the subgrade through the pavement structure, and the stress-strain characteristics of the subgrade play an important role in the overall strength and stiffness of the road structure. In the deformation of the pavement structure, the deformation of the subgrade accounts for about 70% to 90%. The subgrade is generally filled and compacted in layers during the construction process, and the concealment is strong. If the quality of the filler is not good, or the construction control is imprope...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N33/42
Inventor 刘友煖何淼
Owner JIANGSU TRANSPORTATION RES INST CO LTD
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