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Self-powered expressway traffic and roadbed modulus monitoring system and monitoring method

A technology of expressway and monitoring system, which is applied in the field of foundation soil survey, infrastructure engineering, construction, etc. It can solve the problems of inaccurate roadbed and complex load of expressway, achieve comprehensive detection system and accelerate the construction of traffic Internet of Things Effect

Active Publication Date: 2020-08-04
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this device requires power supply equipment, and the load on the expressway is relatively complex. There are many factors that can cause changes in the pressure inside the roadbed. Therefore, it is not accurate to judge whether the roadbed has collapsed by monitoring the changes in the pressure inside the roadbed.

Method used

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  • Self-powered expressway traffic and roadbed modulus monitoring system and monitoring method
  • Self-powered expressway traffic and roadbed modulus monitoring system and monitoring method
  • Self-powered expressway traffic and roadbed modulus monitoring system and monitoring method

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Embodiment Construction

[0041] In order to explain the rationality of this monitoring system, the corresponding theoretical verification is carried out as follows:

[0042] Theoretical verification is based on Biot's wave theory:

[0043]

[0044]

[0045] σ ij =λδ ij θ+μ(u i,j + u j,i )-αδ ij p f

[0046]

[0047] where u i (i=x, y, z) are the displacements of the soil skeleton along the x, y, and z directions respectively; w i (i=x, y, z) the displacement of the liquid phase relative to the soil skeleton along the x, y, and z directions; α, M are saturated soil parameters representing the compressibility of soil particles and pore fluid; ρ, ρ f are the density of soil and liquid phase respectively; m=ρ f / n is a parameter reflecting the porosity of the soil; n is the porosity of the soil; b is the physical quantity reflecting the internal friction force when the fluid-solid relative displacement occurs, u i 、w i The dot above represents the derivative with respect to time t; λ a...

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Abstract

The invention provides a self-energy-supply expressway traffic and roadbed modulus monitoring system and a monitoring method. The system comprises a piezoelectric sensor, a weighing device, an auxiliary unit and a computer terminal; the piezoelectric sensor and the weighing device are buried in an expressway roadbed along an expressway; the auxiliary unit is arranged beside the expressway; the weighing device is used for monitoring the weight of an automobile; the piezoelectric sensor is used for monitoring the speed of the automobile; and finally, the modulus of the roadbed is inversely calculated through the weight and speed of the automobile and the voltage peak of the piezoelectric sensor, and the purpose of detecting the modulus of the expressway roadbed is achieved. The piezoelectricsensor has a mechanical-electrical coupling characteristic, collected vibration energy can be stored in an energy storage capacitor at the same time, and the energy storage capacitor can be used forproviding power for the weighing device and other parts. By means of the self-energy-supply expressway traffic and roadbed modulus monitoring system and the monitoring method, vibration generated by the automobile on the expressway is used, the weight and speed of the automobile and the modulus of the roadbed can be monitored at the same time in a self-power-supply manner, safety pre-warning is provided for the expressway, and construction of the Internet of Things of the expressway is promoted.

Description

technical field [0001] The invention relates to the field of expressway traffic and roadbed modulus monitoring, in particular to a self-powered sensor for monitoring expressway vehicle speed, vehicle weight and roadbed modulus by using piezoelectric technology. Background technique [0002] Under cyclic vehicle loads, a small attenuation of the subgrade modulus may occur. The subgrade modulus is an important indicator to reflect whether the subgrade is in a healthy and stable state, so it is of great significance to monitor the subgrade modulus on the expressway in real time. The traditional roadbed modulus detection method needs to destroy the main body of the roadbed, and it is impossible to monitor the roadbed in real time. [0003] Secondly, the use of piezoelectric materials to make sensors has a long history. Invention patent CN207268904U and invention patent CN107742424A both use piezoelectric materials to make sensors to monitor traffic, but piezoelectric sensors ca...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E02D1/00E02D1/08
CPCE02D1/00E02D1/08
Inventor 曹志刚马力蔡袁强
Owner ZHEJIANG UNIV
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