Methods for actually measuring axle load acting position of pavement structural layer, maximum strain of pavement structural layer bottom and axle load speed

Abstract

The invention discloses methods for actually measuring the axle load acting position of a pavement structural layer, the maximum strain of the pavement structural layer bottom and the axle load speed,and belongs to the field of road engineering. The methods for actually measuring the axle load acting position of the pavement structural layer and the maximum strain of the pavement structural layerbottom are characterized in that the strain ratio of the structural layer bottom is calculated through an elastic layered theoretical system, the vehicle axle load acting position is calculated through the strain ratio, then the relation between the structural layer strain at different distances from the vehicle axle load acting position and the maximum strain is calculated through the elastic layered theoretical system, and thus the maximum strain of the structural layer bottom is obtained. Meanwhile, the method that the effective waveform is intercepted, the time interval of passing of adjacent axles of a vehicle is obtained, and by combining the corresponding axle spacing, the vehicle axle load speed is obtained is provided. Compared with an existing design method, the technical problem that when no axle position sensor is arranged inside the pavement structural layer, the load acting position, the maximum strain of the structural layer bottom and the vehicle axle load speed cannotbe determined is solved, and the methods have the characteristics of being low in measuring cost, rapid, simple, efficient, accurate and the like.

Description

technical field [0001] The invention relates to the field of road engineering, and specifically provides a method for actually measuring the axial load action position of the pavement structure layer, the maximum strain at the bottom of the layer, and the axial load velocity. Background technique [0002] The mechanical response state of the structural bottom is an important factor in the structural design of asphalt pavement. At present, the monitoring of the mechanical response state of the structural bottom is generally carried out by burying asphalt strain gauges at the bottom of the structural layer in the test section. When the vehicle passes over the strain gauge, the data collector is triggered to collect and record it. Pavement structure design usually takes the most unfavorable state as the design standard. Therefore, it is necessary to obtain the strain data when the vehicle load passes directly above the asphalt strain gauge, that is, the strain at the position w...

AI Technical Summary

Problems solved by technology

However, in practical applications, most of the cases are limited to economic or technical conditions, and the shaft position sensor is not buried at the bottom of the pavement structure layer. At this time, it is difficult to obtain the position of the wheel axle load at the bottom of the structure layer and the maximum strain at the bottom of the structure layer.

[0003] At the same time, according to the principle of time-temperature equivalence, it can be known that the internal response of the pavement structure layer is significantly affected by the driving speed. At present, in the dynamic response test of the structural layer, the vehicle speed is generally obtained by reading the speed instrument panel of the detected vehicle. This speed value currently has accuracy. lower question

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