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Method for evaluating ground coefficient K30 values of high-speed railway bed coarse particle soil padding

A high-speed railway and coarse-grained soil technology, which is applied in the field of foundation soil survey, infrastructure engineering, construction, etc., can solve problems such as the failure to complete the project, the increase of manpower and material resources, and the delay of the construction period

Active Publication Date: 2013-12-04
SOUTHWEST JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the existing method of carrying out the rolling test of the test section can accurately determine the K of the selected filler under different compaction coefficients 30 value, but the rolling test in the test section is a time-consuming and labor-intensive process, which requires a large investment of manpower and material resources, especially when multiple selected or improved fillers cannot meet the requirements, the manpower and material resources consumed will be In severe cases, it will even delay the construction period, resulting in the failure of the entire project to be completed smoothly

Method used

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  • Method for evaluating ground coefficient K30 values of high-speed railway bed coarse particle soil padding
  • Method for evaluating ground coefficient K30 values of high-speed railway bed coarse particle soil padding
  • Method for evaluating ground coefficient K30 values of high-speed railway bed coarse particle soil padding

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Effect test

Embodiment 1

[0051] A specific embodiment of the present invention is that the subgrade coefficient K of a high-speed railway embankment coarse-grained soil filler 30 Estimation method, its steps are as follows:

[0052] A. Determination of the maximum dry density of the filler sample

[0053] The maximum dry density ρ of the filler sample measured from the maximum dry density test of coarse-grained soil dmax ;

[0054] B. Determination of the maximum bite force of the filler sample under the control value K of the compaction coefficient

[0055] B1, prepare the shear test sample: according to the maximum dry density ρ of the filler sample obtained in step A dmax , the control value K of the filling compaction coefficient of the subgrade structure layer of the high-speed railway to be filled (the control value K of the filling compaction coefficient can be found in the "High-speed Railway Design Code" (Trial) TB10621-2009), and the dryness of the shear test sample is calculated Density...

Embodiment 2

[0072] A specific embodiment of the present invention is that the subgrade coefficient K of a high-speed railway embankment coarse-grained soil filler 30 Estimation method, its steps are as follows:

[0073] A. Determination of the maximum dry density of the filler sample

[0074] The maximum dry density ρ of the filler sample measured from the maximum dry density test of coarse-grained soil dmax ;

[0075] B. Determination of the maximum bite force of the filler sample under the control value K of the compaction coefficient

[0076] B1, prepare the shear test sample: according to the maximum dry density ρ of the filler sample obtained in step A dmax , The control value K of the filling compaction coefficient of the subgrade structure layer of the high-speed railway to be filled (the control value K of the filling compaction coefficient can be found in the "High-speed Railway Design Code" (Trial) TB10621-2009), and the dryness of the shear test sample is calculated Density...

Embodiment 3

[0082] A specific embodiment of the present invention is that the subgrade coefficient K of a high-speed railway embankment coarse-grained soil filler 30 Estimation method, its steps are as follows:

[0083] A. Determination of the maximum dry density of the filler sample

[0084] The maximum dry density ρ of the filler sample measured from the maximum dry density test of coarse-grained soil dmax ;

[0085] B. Determination of the maximum bite force of the filler sample under the control value K of the compaction coefficient

[0086] B1, prepare the shear test sample: according to the maximum dry density ρ of the filler sample obtained in step A dmax , The control value K of the filling compaction coefficient of the subgrade structure layer of the high-speed railway to be filled (the control value K of the filling compaction coefficient can be found in the "High-speed Railway Design Code" (Trial) TB10621-2009), and the dryness of the shear test sample is calculated Density...

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Abstract

The invention discloses a method for evaluating K30 values of high-speed railway bed coarse particle soil padding. The method includes: A, measuring maximum dry density of padding samples, B, measuring maximum occlusal force Cmax (unit of kPa / M) of the padding samples under compacting factor coefficient control values; C, calculating ground coefficient K30 (unit of MPa / M). The method is specific in theory and enables people to reliably evaluate ground coefficient K30 of the coarse particle soil padding under stipulated compacting factors, so that times of field test section rolling compaction tests are greatly reduced, labor and material input are reduced, and construction period is shortened.

Description

technical field [0001] The invention relates to the technical field of geotechnical engineering, in particular to a foundation coefficient K of a high-speed railway subgrade coarse-grained soil filler 30 Estimation method. Background technique [0002] Due to its excellent physical and mechanical properties, coarse-grained soil has been widely used in large-scale high-speed railway subgrade construction in my country. Coarse-grained soils used in railway subgrades include graded crushed stones, group A and group B fillers, crushed stones in group C, and gravel-type fillers. The "Code for Design of High-Speed ​​Railways" (Trial TB10621-2009) clearly stipulates that the surface layer of the subgrade bed that bears the significant action of the dynamic load of the train shall be made of graded gravel, and the bottom layer of the subbed layer shall be filled with Group A or B group or improved soil. The embankment uses the fillers of Group A and Group B and the crushed stone a...

Claims

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Application Information

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IPC IPC(8): E02D1/00
Inventor 罗强陈坚张良蒋良潍赵明志吕文强刘钢李浩熊勇孔德惠
Owner SOUTHWEST JIAOTONG UNIV
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