Road internal stress and strain dynamic response information acquisition system and method

Abstract

The invention relates to a road internal stress and strain dynamic response information acquisition system and method, belonging to the field of road internal mechanical state detection. Four detection points are arranged during fwd detection. Response data is acquired through stress, strain sensors and a dynamic data acquisition unit which are buried in each structural layer in roads. According to recorded data of each layer of stress and strain sensor and the response time, awaveform is obtained. Effective graphic data is intercepted by the waveform response time, spliced, filtered, and theabnormal data is eliminated to obtain the result data. The response baseline calculation, response duration calculation, response peak record, peak interval record, and peak number record are completed in order. According to the invention, sensors and loads are arranged in a multi-point manner, through a reasonable and standard data processing flow, the system error of a data result is effectivelyreduced, and uncertain errors caused by fatigue, unfamiliar conditions and the like in a manual processing process are avoided.

Description

technical field [0001] The invention relates to the field of road internal mechanical state detection, in particular to the acquisition of road internal stress and strain dynamic response characteristic values ​​for FWD detection. Background technique [0002] The mechanical state of the internal structure of the road is the most direct indicator to evaluate the quality of the road and predict the life of the road. However, it is often difficult to obtain the true state of the internal structure of the road in the actual road. At present, the method usually used in road research is to measure the deflection data of the road surface through fwd (that is, the falling weight deflection meter), and then use the modulus back calculation model to calculate the modulus of each layer of the road, so as to know the road Mechanical properties of the internal structure. The main problems of this method are: (1) All kinds of modulus inversion models are simplified models based on a cer...

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Problems solved by technology

The main problems of this method are: (1) All kinds of modulus inversion models are simplified models based on a certain mechanical assumption. For the double coupled nonlinear (material nonlinear + structural nonlinear) response of road In terms of multi-layer structure, the calculation results of different models under the same parameter conditions and the same model under different parameter conditions have large deviations, and it is difficult to judge the authenticity of the calculation results; (2) the back calculation model usually only calculates 3-4 layer pavement structure, and the amount of calculation is large, when there are many pavement layers, it is usually impossible to calculate or the calculation result is far beyond the normal value

However, due to the large amount of data, low information ratio, and large noise of stress and strain, it is difficult to effectively obtain their response information.

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