新奥法开挖隧洞在大广坝工程中的应用

Application of New Austrian Tunneling Method in Daguangba Irrigation Project

海南省大广坝两条干渠隧洞，根据地质情况选择洞室断面，选择对围岩爆破破坏最轻微的爆破方法，及时支护防止围岩产生有害变形和破坏及加强围岩的现场观测。成功的采用新奥法开挖，并用滑动模板衬砌侧墙砼。

For building 2 tunnels of main canal of Daguangba Project in Hainan Province, chamber profiles were selected according to geological condition, a blasting method with the slightest damage to the surrounding rockmasswas chosen, support works was conducted in time to prevent the surrounding rockmass from harmful deformationand damage and field observation of surrounding rockmass was strengthened. New Austrian tunneling method wascarried out successfully and side walls were lined with concrete by using slide formwork.