Viscoelastic behavior with damage evolution of a new smart geosynthetic in service temperature range

Abstract

A new type of intelligent geosynthetic product, sensor-enabled geobelt (SEGB), is developed to improve the health monitoring of geotechnical structures. It can be used as a strain monitoring sensor owing to its unique property. As a conductive polymer, its electrical resistance regularly changes with its strain. Simultaneously, the SEGB is a geosynthetic product. This implies that it can be used as a reinforcement to strengthen a geotechnical structure. Therefore, to investigate its long-term mechanical properties within the temperature range of its service, a stress relaxation test is performed within the range of −20 °C to 40 °C. The results show that the stress relaxation of the SEGB stabilizes at a certain stress level instead of decreasing to zero. Additionally, the process of its stress relaxation is accompanied by damage. Based on this phenomenon, a ternary physical constitutive model reflecting the constitutive relationship of the SEGB is established. Furthermore, a stress relaxation model involving damage evolution, temperature, and initial strain is established. It can be used to describe the stress relaxation process of SEGB at different service temperatures.

Keywords

sensor-enabled geobelts / damage evolution / stress relaxation / temperature

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