Long-Term Performance of Geosynthetically Reinforced Walls: Implications of Creep and Stress Relaxation on Design

Cms9523141PI：Kaliakin等人，特拉华大学土工合成加筋土结构的时变响应问题需要从基本力学的角度进行研究，需要关注现有的设计程序和未来的应用。缺乏应力松弛实验数据，以及缺乏合理考虑蠕变和应力松弛的加固本构模型，阻碍了对应力松弛行为的透彻理解。本研究的主要目的是：1)实验研究土工合成材料加筋的应力松弛；2)建立一个简单的本构模型来真实地模拟加筋材料的时变行为；3)将该模型应用到现有的有限元计算机程序中，并验证该模型的预测能力；4)对工作应力条件下的土工合成材料加筋墙体进行广泛的数值参数研究。研究结果将有助于了解土工合成加筋与回填土相互作用的时变特性，使这类结构的设计更加合理。

ABSTRACT CMS9523141 PI: Kaliakin, et al., University of Delaware The problem of time-dependent response of geosynthetically reinforced soil structures requires study from the standpoint of fundamental mechanics, and attention is needed on current design procedures and for future applications. Standing in the way of a thorough understanding of the time-dependent behavior are the lack of stress relaxation experimental data, and the lack of a robust constitutive model for the reinforcement that will account for both creep and stress relaxation in a rational manner. The major objectives of the research are: 1) to experimentally study stress relaxation of selected geosynthetic reinforcement, 2) to develop a simple constitutive model to realistically simulate the time dependent behavior of the reinforcement, 3) to implement this model into an existing FE computer code, and to verify the predictive capabilities of the model, and 4) to conduct an extensive numerical parametric study of geosynthetically reinforced walls at working stress conditions. The results will facilitate the understanding of time dependent behavior of geosynthetic reinforcement interactive with backfill soil and will make the design of such structures more rational.