摘要
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℃ to 40℃.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.
本文研发了一种新型智能土工合成材料,即传感型土工带(SEGB),用以改善岩土结构的健康监测。一方面,SEGB作为导电聚合物,其电阻可以随着形变而有规律地变化,可以用作变形监测传感器。另一方面,SEGB是一种土工带,可以作为筋材来加强土工结构。为了研究其在不同使用温度下的长期力学性能,对其在−20℃~40℃的服役温度范围内进行应力松弛试验。结果表明,SEGB的应力松弛最终会稳定在一定的应力水平上,而不是下降到零。此外,应力松弛的过程伴随着损伤的演化。基于这一现象,建立了反映SEGB本构关系的三元件物理模型,以及涉及损伤演化、温度和初始应变在内的应力松弛模型。应力松弛模型可以用来描述SEGB在不同服役温度下含损伤的应力松弛过程。
基金
Project(2018YFB1600100)supported by the National Key Research and Development Project of China
Projects(51778346,52027813)supported by the National Natural Science Foundation of China
Project(2019GSF111007)supported by the Key Research and Development Project of Shandong Province,China。
作者简介
Corresponding author:崔新壮,PhD,Professor,E-mail:cuixz@sdu.edu.cn,ORCID:https://orcid.org/0000-0003-1501-3931。
