地震荷载作用下包边填砂路堤动力特性分析

Dynamic Characteristic Analysis of Earthquake Vibratory Load for Road Structure of Filled-Sand and Clay Wrapping

包边填砂路堤是采用一种砂或砂石料填筑,用粘性土包边封顶的路堤结构形式,在地震荷载下,填砂料与包边粘性土各自的动力特性,以及它们之间相互作用所表现出的动力响应直接影响到路面结构及其路堤变形。本文针对软土地基上的包边填砂路堤路基所采用CFG桩和塑料排水板堆载预压这两种不同地基处理方法,采用FEM建模和模拟地震波信号分析方法,计算分析了地震震动荷载作用下包边填砂路堤与加固后路基的协同动力反应性态,以及震动影响下的路堤与路基的整体变形特性。计算结果表明,采用CFG桩路基处理加固后的包边填砂路堤其震动响应显著优于塑料排水板地基处理方法。

Filled-Sand and Clay Wrapping（FSCW） is a road surface structure that sand or stone is filled-up ground and clay is used as wrapping and binding. Dynamic characteristics of filled-sand and wrapping clay, respectively, and interacting between them under earthquake vibratory load would directly influence on road condition and deformation shape of highway. In this paper, for two foundation treatments, CFG pile reinforcement and plastics drainage plate preloading, synergism dynamic response feature and deformation rule of road filled-sand and clay wrapping including reinforcing foundation under earthquake vibratory load are calculated and analyzed with FEM method. The shock response of the road reinforced by CFG pile is obviously better than the ground base reinforced by plastics drainage plate preloading.