Abstract: Setting approach slap and paving geogirds are two primary measures to reduce the bridge head bump．The length of the approach slap should be shortened even be cancelled as enhancing the rebound module of the padding in the back of the abutment．According to the data of the ground module heightened by paving geogirds to deal with the bridge head bump in the freeway from Liangping to Changshou in Chongqing，This article analyses the relation among the ground module，the depth of abutment and the length of the approach slap，which can be referenced in the correct design an d construction of the approach slap by utilizing finiteelement program．

Key words: bridgehead-bump, approach slap, ground module, abutment depth, finite element

摘要： 设置桥头搭板和加铺土工格栅是处理桥头跳车的两种主要措施．当桥台台背填土的回弹模量提高后，所需 桥头搭板长度可以减小甚至搭板完全取消，本文利用重庆梁(平)长(寿)高速公路土工格栅处治桥头跳车得到 的有关地基模量提高的数据资料，借助有限元计算手段，计算地基模量、桥台高度与搭板长度之间关系，为桥头 搭板的正确设计和施工提供依据．

关键词: 桥头跳车：桥头搭板, 有限元, 地基模量, 桥台高度