摘要
在地下过流隧洞设计中,由于结构布置、地质条件等因素影响,隧洞进、出口两端之间不能以均匀坡度连接,有时在较短水平距离内需有较大高程变化。考虑到需保持水流的平顺,降低水头损失以及减小水流对隧洞的冲刷,高程变化处不宜采取竖井形式,而是设置为龙抬头结构形式斜井。龙抬头结构形式斜井具有长度短,倾角陡,上、下弯段空间小等特点,这给开挖支护施工带来了较大难度,施工方法的选择关系到施工安全、质量以及成本,对龙抬头结构形式斜井开挖支护施工方法进行分析研究具有较大意义。结合丰宁抽水蓄能电站尾水隧洞末端斜井施工实践,对龙抬头式斜井开挖支护施工技术进行分析,选择技术可行、经济合理的施工方案。
In the design of underground overflow tunnel,due to the influence of structural arrangement,geological conditions and other factors,the inlet and outlet ends of the tunnel can’t be connected by uniform gradient,and sometimes large elevation changes are required in a short horizontal distance.Because it is necessary to keep the water flow smooth,reduce head loss and reduce water flow scouring to the tunnel,the head-up inclined shaft should be set instead of the shaft at the elevation change.Head-up inclined shaft is characterized by short length,steep inclination and small space in upper and lower bends,which brings great difficulty to its excavation and support construction.The selection of construction method is related to construction safety,quality and cost,so it is of great significance to analyze and study the construction method of excavation and support for head-up inclined shaft.Based on the construction practice of inclined shaft at the end of tailrace tunnel of Fengning Pumped Storage Power Station,this paper analyses the construction technology of excavation and support of head-up inclined shaft,and selects a feasible and economical construction scheme..
作者
唐明秀
阎金涛
李乔生
洪荣
TANG Ming-xiu;YAN Jin-tao;LI Qiao-sheng;HONG Rong(YUNNAN WATER DIVERSION PROJECT CONSTRUCTION ADMINISTRATION,Kunming 650000,China;POWERCHINA SINOHYDRO ENGINEERING BUREAU 14 CO.,LTD.,Kunming 650041,China)
出处
《云南水力发电》
2021年第8期83-88,共6页
Yunnan Water Power
