A sensor for testing internal shear stress of pavement structure layer and its embedding process and application

Abstract

The invention discloses a pavement structure layer internal shearing stress testing sensor and an embedding technology and application thereof. The pavement structure layer internal shearing stress testing sensor comprises a first sensor, a second sensor and a third sensor which are embedded into the same plane, wherein the first sensor is horizontal, and an included angle between the first sensor and the second sensor and an included angle between the second sensor and the third sensor are alpha and beta respectively. The embedding technology of the pavement structure layer internal shearing stress testing sensor includes: fixedly arranging the three sensors in the same plane at specific angles, measuring the angles alpha and beta, embedding the sensors with positions fixed into materials to be embedded into an identical pavement structure layer, and compacting a test piece by the aid of an indoor bituminous mixture test piece forming machine; fixing the bituminous mixture test piece, which is prefabricated indoors and includes the sensors, at a corresponding position of a pavement structure for embedding the sensors. The pavement structure layer internal shearing stress testing sensor and the embedding technology and application thereof have the advantages that internal shearing stress of the bituminous pavement structure layer can be measured, and success rate for embedding the sensors is increased.

Description

technical field [0001] The invention relates to an arrangement mode and an embedding process of a sensor for measuring internal shear stress of a pavement structure layer and its application in measuring the internal shear stress of an asphalt pavement structure layer. Background technique [0002] At present, in order to detect the internal stress and strain state of the asphalt pavement structure layer under the action of driving load, the method of embedding sensors in the pavement structure layer during the asphalt pavement construction stage is mostly used, and the sensors used are mostly fiber grating strain sensors. At present, in terms of sensor embedding technology, the sensor is directly fixed at the position where the pavement structure layer is laid, and then the asphalt mixture is paved and rolled. Due to the limitations of the embedding process, the arrangement directions of the sensors are mostly the longitudinal (traveling direction), transverse and vertical ...

AI Technical Summary

Problems solved by technology

In the current sensor embedding method, the rolling force of the road roller during the asphalt surface construction process will cause the sensor to bear a lot of pressure, resulting in damage to the sensor and a decrease in the success rate of embedding; and in terms of sensor layout, since the sensor is only along the line The longitudinal, transverse and vertical arrangement of the road, so that the strain values ​​in these three directions can be obtained, but its main defect is that the shear stress in the asphalt pavement structural layer under the action of driving load cannot be obtained

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