长距离大断面水工隧洞下半洞开挖施工技术研究

Study on Excavation Technology of the Lower Half of Long-distance and Large-section Hydraulic Tunnel

对于大断面水工隧洞的施工一般分上、下半洞进行开挖,待上半洞完成后再进行下半洞的开挖,但由于隧洞距离长、地质条件复杂、工期紧等因素,通常上、下半洞需平行搭接作业才能满足进度要求,而平行搭接施工存在施工道路、设备共用调度等干扰,通常需要加强施工过程中的组织与管理,才能确保工程进度与安全,结合硬梁包水电站引水隧洞的实际情况,阐述了长距离大断面水工隧洞下半洞开挖施工技术。

Large-section hydraulic tunnels are generally divided into upper and lower halves for excavation.Excavation of the lower half normally starts when the upper half is completed.However,due to such factors as long distance,complex geological conditions,and tight construction period,the upper and lower halves are usually excavated synchronously to meet requirements for construction schedule,but that poses interferences in construction roads,requirements for sharing and joint scheduling of equipment.In this case,it is necessary to strengthen organization and management of construction process so as to ensure the progress and safety of the project.The author expounds the construction technology of the lower half of long-distance and large-section hydraulic tunnel taking actual situation of the headrace tunnel of Yingliangbao Hydropower Station as an example.