路基结构性能衰变影响因素与机理分析  

Analysis on Factors Affecting Performance Decay of Subgrade Structure and the Mechanism

作　　者：李冬雪[1] 孙宗元[2] 

机构地区：[1]吉林省交通科学研究所季冻区公路建设与养护技术交通行业重点实验室,长春130012 [2]同济大学道路与交通工程教育部重点实验室,上海201804

出　　处：《路基工程》2014年第6期42-45,50,共5页Subgrade Engineering

摘　　要：准确掌握路基结构性能与湿度的相关性,并且能够进行科学的表征,是完善"力学-经验"设计法的基础。鉴于此,综述了路基结构性能的主要影响因素,并探讨了路基结构性能的衰变机理。结果表明:应力状态与路基湿度对路基结构性能影响最为显著,而路基性能衰变可从非饱和土基质吸力、抗剪强度及细颗粒土流失等方面进行解释。Understanding the correlation between subgrade structure＇s performance and humidity correctly and representing it scientifically is the base to perfect＇mechanics-empirical＇design method; thus this paper summarized the main factors affecting the subgrade structure＇s performance and discussed the decay mechanism thereof. The results show that the stress status and subgrade humidity have most significant influence on the performance; and the performance decay may be explained from the aspects of unsaturated soil＇s matric suction, shear strength and fine-grained soil＇s erosion.

关 键 词：路基 路基湿度 回弹模量 永久变形 非饱和土土力学 

分 类 号：U416.1[交通运输工程—道路与铁道工程]