考虑筋材蠕变特性的加筋土流变模型  

Rheological model considering creep of geosynthetics for reinforced soil

作　　者：李丽华[1] 王钊[2] 陈轮[1] 

机构地区：[1]清华大学水利水电工程系,北京100084 [2]武汉大学土木建筑工程学院,武汉430072

出　　处：《岩土力学》2007年第8期1687-1690,共4页Rock and Soil Mechanics

基　　金：国家自然科学基金资助项目成果(No.50279036)

摘　　要：把加筋土体的分析看成黏弹性阶段和黏弹塑性两个阶段。考虑筋材的蠕变特性,给出了黏弹性阶段加筋体的弹性应变、筋材的应力和土体的水平微观应力。由方程可知,随着时间的增长,筋材发生按负指数衰减的应力松弛,筋材的应力降低、应变增加。给出了塑性阶段开始到达的时间和变形,在黏弹塑性阶段,加筋体中应力保持恒定,整个应变由于蠕变的发生逐渐增加。由此可针对具体的工程例子分析加筋土体的应力和变形情况,尽量减轻由于加筋土体强度、稳定性降低、变形增加造成的严重后果。The analysis of reinforced soil is regarded as two stages： viscoelastic stage and visco-elastoplastic stage. The creep performance of geosynthetics is considered. Elastic strain of reinforced soil, stress of geosynthetics and horizontal microstress of soil in viscoelastic stage are given. Stress relaxation appears weakening by negative index as the time increasing. At the same time strain of geosynthetics is increasing. The time and deformation corresponding to initiation of the plastic stage are given. Stress in the reinforcement remains constant in visco-elastoplastic stage. But the deformation remains increasing due to creep. Therefore the stress and strain in reinforced soil can be analyzed in different cases history. Then severe consequence due of strength and stability weakening and deformation increasing, can be reduced.

关 键 词：蠕变 加筋土体 土工合成材料 

分 类 号：TU472.34[建筑科学—结构工程]