考虑土体蠕变的桥台长期变形机理分析

Analysis of the Mechanism of Long-Term Deformation Considering the Creep of Soil Abutment

服役期的桥台在荷载作用下随着时间的增长会不断发生变形。考虑土体的蠕变特性,研究桥台长期变形机理,并提出防治措施。结果表明:在土体蠕变启动初期,桥台产生较快滑移变形,之后变形速率逐渐减小,经历一段时间后,变形速率趋向较小的稳定值,桥台匀速缓慢变形。改善土基的物理特性,采用桩基础传递桥面荷载到较深持力层,能有效地减少桥台长期变形现象的发生。

Abutment deform constantly under load with the increase of time during the service period.considering the creep of soil,the mechanism of long-term deformation of abutment is sdudied.The prevention measures are put forward.It shows that the abutment slip quickly in the early stage of creep,and then deformation rate decreases.After a certain time,the rate of deformation trend of a stable value,the deformation of abutment maintains uniformly and slowly.Improving the physical properties of soil and using of pile foundation can effectively reduce the long-term deformation of bridge.