Calibration method and device for dynamic stress test of railway subgrade

A technology of railway embankment and calibration method, which is applied in the field of foundation soil survey, road, infrastructure engineering, etc., can solve the problems of inaccurate calibration coefficient, reduce the normal stress of box surface, and low, and achieve the goal of improving accuracy Effect

Active Publication Date: 2017-03-22
CHINA SHENHUA ENERGY CO LTD +2
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  • Abstract
  • Description
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Problems solved by technology

That is, due to different media conditions and stress distributions, the data measured by the pressure cell may be lower or higher compared to the case of uniform loading
In addition, due to the deformation of the box surface, the arch effect and the shear stress of the box surface may also reduce the normal stress on the box surface
Due to the existing calibration method, the calibration environment is different from the test environment, therefore, the obtained calibration coefficient is inaccurate

Method used

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  • Calibration method and device for dynamic stress test of railway subgrade
  • Calibration method and device for dynamic stress test of railway subgrade

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Embodiment Construction

[0016] Specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings. It should be understood that the specific embodiments described here are only used to illustrate and explain the present invention, and are not intended to limit the present invention.

[0017] figure 1 It is a structural schematic diagram of a calibration device for railway subgrade dynamic stress testing according to the present invention. Such as figure 1 As shown, the calibration device provided by the present invention may include: a pressure sensor 10 installed in the railway embankment for outputting a corresponding sensor signal in response to the pressure on the railway embankment, wherein a bearing plate is arranged on the surface of the railway embankment , a medium of known weight is stacked on the carrier plate; and an acquisition analyzer 20 is used to determine the relationship between the actual pressure and the sensor signal a...

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Abstract

The invention discloses a calibration method and device for a railroad bed dynamic stress test. The calibration method comprises the steps that a pressure sensor arranged in a railroad bed responds to the pressure borne by the railway bed to output a corresponding sensor signal, a bearing plate is arranged on the surface of the railway bed, and media with known weight are loaded on the bearing plate in a stacked mode; the relation between the actual pressure and the sensor signal is determined according to the weight of the media and the sensor signal to determine a calibration coefficient. The calibration coefficient obtained through the calibration method is accurate, and the test accuracy is improved.

Description

technical field [0001] The invention relates to medium pressure calibration, in particular to a calibration method and device for railway subgrade dynamic stress testing. Background technique [0002] The subgrade is the foundation of the track. With the overall speed-up of the railway, the technical requirements for the subgrade also increase accordingly, and the dynamic stress change of the subgrade under the speed-up state is the main reason for the deformation or even destruction of the subgrade. Therefore, it is necessary to use a pressure sensor (such as an earth pressure sensor) to detect the pressure on the roadbed in order to analyze the force of the roadbed. Among them, the earth pressure sensor is generally calibrated in the laboratory, including air pressure calibration, liquid calibration (such as oil standard), and soil medium (such as gravel) calibration. [0003] In the calibration process, the pressure cell is usually buried in the soil or concrete or embed...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E02D1/00
CPCE01B2/006E02D1/00
Inventor 薛继连贾晋中孟宪洪黄立军唐永康何占元蔡德钩王立军陈锋
Owner CHINA SHENHUA ENERGY CO LTD
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