安新高速公路改建工程台阶开挖方案分析

随着我国经济的迅速发展,一些现有高速公路已不能适应交通量增长的要求,需要扩大道路通行能力,面临改扩建问题,而开挖台阶是新老路基结合处常用的技术措施之一。结合安新高速公路改建工程,分析了旧路开挖施工时可能产生坍塌的原因,提出合适的台阶开挖尺寸,针对不同路基填料尤其是不易松散土(粘土)与易松散土(砂土)提出相应的台阶开挖方案。研究表明,合适的台阶开挖方案有良好的效果,并可以有效避免施工过程中旧路基的坍塌,保证路基稳定性。研究成果对高速公路改建工程台阶开挖的设计与施工具有借鉴意义。

Analysis on Scheme of Digging Steps in Anxin Widening Expressway

With the rapid development of economic,some expressways cannot meet the requirements of traffic volum increasing.It is an acute problem to rebuild these expressways, and digging steps is one of the usual measures.On basis of Anxin Widening Expressway,the reasons of possible collapse on the old roadbed during construction are analysed,and appropriate sizes of steps put forward.Besides,corresponding schemes of digging steps in allusion to different filling of roadbed are presented.The results show that appropriate schemes have good effect,and can avoid collapse of the old roadbed.The research results have significance for digging steps in widening expressway.