The problem of depression of the bridge approach road is the usual defect of the road in our country at present , in order to solve this problem , the high road of chang yu sandpile to settle soft subgrade to strengthen it 公路桥头引道沉陷是目前国内公路较常见的道路病害，为了解决这一问题，长余高速公路利用砂桩对桥头软弱地基进行了加固处理。
