既有公路扩堑高边坡控制爆破施工技术

Controlled blasting technology for the high cutting slope expansion of existing roads

新建公路经常遇到与既有公路交叉、搭接、合并的情况,须对既有公路原有路堑高边坡扩堑施工。该类工程往往具有既有公路交通疏导任务重、施工干扰和难度大、危险性高、工期紧的特点,扩堑石质边坡通常采取控制爆破技术施工。文章拟通过对新建铜黄高速公路联络线右线YK2+348.65-YK2+552.369段路基与既有铜黄一级公路K120+800-K121+083.969右幅路基合并段扩堑边坡的控制爆破施工过程,总结既有公路扩堑高边坡控制爆破施工技术。

The new built roads usually intersect,lap or combine the existing ones.In this case,the expanding construction on the high cutting slope of the existing roads has to be done.Such projects perform critically on dredging traffic,so that it is difficult to construct,and dangerous.Expanding construction usually adopts controlled blasting technology.This article makes a summary on the controlled blasting technology on the high cutting slope of the existing roads by analyzing the controlled blasting process of the combination of the right line YK2＋348.65～YK2＋552.369 of the new built Tonghuang high-speed way and the right subgrade of the existing Tonghuang first class road K120＋800～K121＋083.969.