沐若水电站引水发电建筑物设计

Design of water diversion and power generation structures of Murum Hydropower Station

马来西亚沐若水电站采用引水式地面厂房,总装机944 MW。主要介绍了水电站厂房区域边坡的支护设计、调压井结构设计、深埋引水隧洞设计、衬砌排水设计、主厂房设计等关键引水发电建筑物的设计过程。主要设计亮点有:将调压井上部井筒与下部阻抗孔设计成非同心结构,以增大两个调压井间距;对调压井分段分高程配筋,并对井筒围岩作灌浆处理以提高围岩承载力并减小渗透性;对引水隧洞的上平段及下平段分别采用了混凝土衬砌和钢衬钢筋混凝土衬砌;将隧洞衬砌外排水管网和钢衬外表面排水设计成盲沟,提高了钢衬抗外压失稳的安全度。

Murum Hydropower Station in Malaysia, with a total installed capacity of 944MW, is designed as a ground power- house with a water diversion tunnel system. We mainly present the design process of the water diversion and power generation structures, including stability analysis of powerhouse slope, design of surge shaft, deeply buried water diversion tunnel, drainage design of lining, design of main powerhouse. The design highlights are as follows： upper part of the surge shaft and the lower im- pedance hole are designed as a non- concentric structure to widen the distance between two surge shafts; steel reinforcement of surge shaft is designed in segmentation according to different elevation and rock mass grouting is conducted to strengthen bearing capacity and reduce permeability ; concrete lining and steel - lined reinforcement concrete lining are adopted respectively at upper horizontal section and lower horizontal section of the diversion tunnel; blind drainage ditches are designed respectively for drain- age network outside tunnel lining and exterior surface of steel lining so as to improve the stability and safety under external pres- sure.