Study on the Interaction Influence of Strain Sensor and Asphalt Mixture Based on Discrete Element Method
In order to improve the reliability and working life of sensor strain response monitoring,the interaction influence of strain sensor and asphalt mixture was studied from the perspective of micromechanics.Based on the dis-crete element method,the 3D particle flow program was used to construct an asphalt mixture specimen model with built-in strain sensors.By the four-point bending simulation test,the internal stress transfer,force chain distribu-tion and micro-crack development and evolution of the structure were analyzed under the synergistic force of the strain sensor and the asphalt mixture.The results show that the PFC model has high reliability and simulation degree by monitoring the coordination number;The embedded strain sensor reduces the strength of the matrix structure by 2.7％,so that the maximum tensile stress is transferred from the bottom of the mid-span beam to the strain sensor flange position,and a stress concentration effect is formed around the strain sensor,resulting in a decrease in the mechanical properties of the asphalt mixture;Under the synergistic force of the strain sensor and the asphalt mixture,the internal tensile cracks of the structure show the change characteristics of"rapid increase,increase followed by decrease",and the tensile cracks account for 72.9％of the total cracks;"Stretching-based,tension-shear coexistence"is the development form of structural damage and failure.
discrete element methodstrain sensorasphalt mixtureinteractive influencemechanical behavior
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