High-speed rail roadbed fine-grained soil mixing amount upper limit determining method

A high-speed railway-based, method-determining technology, applied in measuring devices, analyzing materials, and using wave/particle radiation for material analysis, etc., can solve problems affecting the safety of trains, the allowable dosage is not comprehensive enough, changes, etc., and achieve excellent durability Effect

Active Publication Date: 2018-09-14
SOUTHEAST UNIV
7 Cites 1 Cited by

AI-Extracted Technical Summary

Problems solved by technology

High-speed railway trains are more sensitive to the deformation response of the subgrade under high-speed running conditions. A small subgrade frost heave will affect the smoothness and ride comfort of the railway, and more seriously affect the safety of the train and greatly increase the railway construction Department's line maintenance workload and maintenance costs
The problem of frost heaving is usually manifested as deformation of the subgrade, which will cause changes in the elevation of the track surface and cause unevenness of the track. In severe cases, it will affect the safety of train operation
[0004] High-speed railway-based fillers include gravel aggregates and fine-grained soil fillers. The microstructure of fine-grained soil fillers refers to the size, shape, spatial...
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Method used

In order to further improve the efficiency of the inventive method, the connected area of ​​fine-grained soil distribution in the filler sample and the box fractal dimension and frost heaving rate can be set up as functional relationship, and later stage is aimed at similar filler, scans filler by X-ray tomography The m...
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Abstract

The invention discloses a high-speed rail roadbed fine-grained soil mixing amount upper limit determining method. The high-speed rail roadbed fine-grained soil mixing amount upper limit determining method comprises the following steps of (1) preparing filling samples different fine-grained soil content; (2) performing indoor frost heaving test to measure the frost heaving ratio of every filling sample; (3) performing X-ray tomographic scanning on the filling samples, counting and analyzing the area of communication and the box-counting fractal dimension of distribution of the fine-grained soilin every filling sample, and establishing function relations to fine-grained soil content; (4) comprehensively analyzing the change tendency of the fine-grained soil content along with the area of communication and the box-counting fractal dimension as well as the frost heaving ratio corresponding to different fine-grained soil content, determining the maximum mixing amount of fine-grained soil in roadbed filling. The high-speed rail roadbed fine-grained soil mixing amount upper limit determining method takes into consideration the influence of distribution of fine-grained soil filling and microscopic pores, and through a porous structure microscopic analyzing method and an image processing method, can accurately acquire the fine-grained soil mixing amount upper limit meeting the requirements of non-frost heaving filling, thereby being favorable to developing high-speed rail roadbed filling with excellent durability.

Application Domain

Material analysis using wave/particle radiation

Technology Topic

Soil scienceMicro level +8

Image

  • High-speed rail roadbed fine-grained soil mixing amount upper limit determining method
  • High-speed rail roadbed fine-grained soil mixing amount upper limit determining method
  • High-speed rail roadbed fine-grained soil mixing amount upper limit determining method

Examples

  • Experimental program(1)
  • Effect test(1)

Example Embodiment

[0032] Example
[0033] Weigh the graded crushed stone of the same quality, take tap water and 3%, 5%, 8%, 10%, 15%, 20%, 30% of the fine-grained soil with mass fractions of 3%, 5%, 8%, 10%, 15%, 20%, and 30%. After curing for one day at 20±2°C and humidity above 90%, samples of roadbed fillers with different fine-grained soil content were obtained.

PUM

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Description & Claims & Application Information

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