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A test method for frost heaving performance of cement graded crushed stone for high-speed railway foundation

A technology of grading gravel and high-speed railway foundation, which is applied in the direction of measuring devices, optical devices, material thermal analysis, etc., can solve the problems of poor practicability and large error range, and achieve a small error range, simple method, and high measurement accuracy. Effect

Inactive Publication Date: 2019-03-05
SOUTHEAST UNIV +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] At present, the existing testing methods for the frost heave performance of cement graded crushed stones used in high-speed railway foundations have defects such as poor practicability and large error ranges.

Method used

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  • A test method for frost heaving performance of cement graded crushed stone for high-speed railway foundation
  • A test method for frost heaving performance of cement graded crushed stone for high-speed railway foundation
  • A test method for frost heaving performance of cement graded crushed stone for high-speed railway foundation

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034]Weigh the raw materials according to the mass fraction, take 90% of graded crushed stone, 5% of cement, and 5% of tap water, mix them well and pour them into shapes. The curing temperature is 20±2°C, the curing humidity is above 90%, and the curing is 28 days. The central wavelength of the fiber grating in the experimental group was 1533±0.5nm, the wavelength of the fiber grating in the control group was 1527±0.5nm, and the cooling rate was 0.1°C / min. The experimental results show that when the temperature reaches -30°C, the strain of the experimental group is -312με, and the strain of the control group is -378με, that is, the actual strain of cement graded crushed stone is 66με.

Embodiment 2

[0036] Take graded gravel, cement, and water of the same quality, and shape and maintain them in the same way. The central wavelength of the fiber grating in the experimental group was 1531±0.5nm, and the cooling rate was 0.05°C / min. The experimental results show that when the temperature reaches -10°C, the fiber grating strain of the experimental group is -176με, and when the temperature drops to -30°C, the strain is -368με.

Embodiment 3

[0038] Take graded gravel, cement and water in the same way, the cement content is 5%, the water content is 5% (the water-cement ratio is 1), and the standard molding maintenance is carried out. Water immersion treatment obtained samples with saturation degrees of 10%, 30%, 50%, and 80%, respectively. The central wavelength of the fiber grating in the experimental group was 1542±0.5nm, and the cooling rate was 0.01°C / min. The experimental results show that when the water saturation is about 30%, the shrinkage and frost heaving strain of the sample are basically the same, which is regarded as the critical water saturation under this dosage.

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Abstract

The invention discloses a cement grade gravel frozen-heave performance detection method for a high-speed railway bed. An optical fiber grating is used as a main study method for testing the frozen-heave performance of the cement grade gravel under the negative temperature condition; a blank optical fiber grating control group experiment is set for solving the problem of temperature compensation of the optical fiber grating material per se on deformation at the temperature change. The optical fiber grating measures the frozen-heave performance of the cement grade gravel; the temperature, the stress, the strain or other physical quantity change of environment of the optical fiber grating can be better detected; through different tests, the deformation behavior of the cement stage gravel under the negative temperature condition can be analyzed and studied; the frozen-heave performance of the cement grade gravel at the low-temperature environment can be better obtained. Compared with the prior art, the invention provides the efficient practical and accurate cement grade gravel frozen-heave performance detection method for the high-speed railway bed; the measurement precision is high (capable of reaching 1mu Epsilon); the practicability is high; the error range is small, and the like.

Description

technical field [0001] The invention relates to a detection method for the frost heave performance of cement graded crushed stones used in high-speed railway foundations, and belongs to the research field of cement graded crushed stones used in high-speed railway roadbeds. Background technique [0002] With the continuous acceleration of my country's reform and development and the leapfrogging of economy and technology, my country's railway technology continues to develop rapidly, especially the rapid development of high-speed rail technology, which embodies the progress of China's railway transportation to achieve leapfrog development, making China's railway infrastructure overall Achieve historical leap-forward horizontally. [0003] The subgrade in the high-speed railway engineering system is the basis for bearing the track structure and train load, and is an important part of railway engineering. In addition to basic functions, it should also meet the impact load requirem...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N25/00G01B11/16
CPCG01B11/165G01N25/00
Inventor 蒋金洋赵国堂杨国涛佘伟潘利
Owner SOUTHEAST UNIV
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