Testing method for compactness of pre-paved ballast bed

A detection method and technology of compaction degree, applied in the directions of roads, tracks, measuring instruments, etc., can solve the problems of volume deviation of measuring pits and deviation of detection results, so as to reduce the influence error and the probability of test deviation, and the steps are simple. Effect

Active Publication Date: 2020-06-19
CHINA RAILWAY 21TH BUREAU GROUP
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  • Claims
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Problems solved by technology

[0003] The present invention aims to provide a pre-paved ballast ballast bed density detection method to solve the problem that the existing water filling method and sand filling method compactness test method have large deviations in the volume of the test pit and are prone to deviations in detection results

Method used

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  • Testing method for compactness of pre-paved ballast bed
  • Testing method for compactness of pre-paved ballast bed
  • Testing method for compactness of pre-paved ballast bed

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Embodiment

[0038] The present invention aims to provide a method for detecting the density of a pre-paved ballast ballast bed to solve the problem that the existing water filling method and sand filling method compactness test method have large deviations in the volume of test pits and are prone to deviations in detection results.

[0039] Please refer to the attached figure 1 , the compactness test method provided by the invention mainly comprises:

[0040] Collect sample data:

[0041] First, take multiple samples from the test site to carry out the plate load test, and record the load intensity σ i and sinkage S i , get the foundation coefficient K i = σ i / S i , is the diameter of the load plate 200;

[0042] At the same time, multiple samples were taken from the corresponding test site for conventional compaction tests, and the same sample was simultaneously tested with multiple compaction test methods and data were collected. In this embodiment, the same sample was tested by ...

Embodiment approach

[0049] Wherein, the plate load test of the sample is the same as the plate load test of the test surface 100 . Please refer to the attached figure 2 , the implementation method of the plate load test is as follows:

[0050] 1. If the test surface of the test site is not flat enough, level the test site first, and then place the load plate 200 flat on the test surface 100 so that the load plate 200 is in good contact with the test surface 100 .

[0051] In order to ensure that the load plate 200 is in good contact with the test surface 100, after leveling the site, first lay flexible filler on the test surface 100, then place the load plate 200 flat on the filler, rotate the load plate 200 and hit the load plate 200 to discharge air so that the load plate 200 is in full contact with the test surface 100 . In this embodiment, the flexible filler is gypsum putty, and the surface of the loading plate 200 is coated with an oil film to prevent the gypsum putty from adhering.

[...

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Abstract

The invention relates to the field of foundation compactness testing, in particular to a method for testing compactness of a pre-paved ballast track bed, including the steps of carring out plate loadtest on test surface of test site to obtain foundation coefficient K of the test surface of test site, and substituting foundation coefficient K into polynomial regression equation p=AK2+BK+C to obtain compaction density po. The polynomial regression equation is obtained by the following steps: carrying out plate load test on a plurality of samples taken from the test site to obtain the foundationcoefficient K = theta / S; testing the above samples by both irrigation and sand pouring methods, and then obtaining the average value of the results of the two tests to obtain the compaction density Rho; taking the foundation coefficient K and compaction density Rho as the transverse and longitudinal coordinates respectively to establish the coordinate system, and fitting the discrete points linearly to obtain the polynomial regression equation. The invention has the advantages of high operability, less external influence factors, reduced volume deviation of the quantity test pit and the probability of test deviation, and accelerated compactness test speed.

Description

technical field [0001] The invention relates to the field of testing the degree of compaction of a pre-paved ballast bed, in particular to a method for detecting the degree of compaction of a pre-paved ballast bed. Background technique [0002] Commonly used detection methods include water filling method and sand filling method, which are more accurate for the detection of the compactness of subgrade fillers, but due to the large and irregular gaps between the ballasts, there is a deviation in the volume of the test pit: ①Compactness water filling method The volume of the test pit is measured by filling the water with plastic film on the test pit. Due to the ductility of the plastic film, the plastic film cannot fully fill the volume of the test pit, resulting in a slightly smaller volume measurement than the actual test pit and a higher density of the ballast bed; ② Sand filling The method is to measure the volume of the test pit with fine sand on the test pit. Because the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E01B35/00
CPCE01B35/00
Inventor 姚璐阎福全魏杨敏武林李芳李军忠杜鹏涛罗三亮宋凯强马国龙
Owner CHINA RAILWAY 21TH BUREAU GROUP
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