三峡大坝泄洪坝段布置与结构设计  

Layout and structural design of TGP spillway dam section

作　　者：高润德[1] 胡进华[1] 陈志康[1] 

机构地区：[1]长江水利委员会设计院枢纽处

出　　处：《人民长江》1997年第10期16-17,共2页Yangtze River

摘　　要：三峡大坝泄洪坝段总长４８３ｍ，最大坝高１８３ｍ，为混凝土重力坝，共布置有３层６７个泄洪孔，其中表孔２２个、深孔２３个、导流底孔２２个。表孔、深孔为永久泄洪设备。枢纽最大泄洪能力达１０２５００ｍ３／ｓ。泄洪坝段３层大孔口，坝体布置、结构复杂。坝基采用了封闭抽水排水措施，以减小扬压力；大坝横缝在高程１１０ｍ以下进行接缝灌浆，以增强大坝整体性和改善孔口应力；深孔有压段采用钢板衬护，以改善孔口的抗磨蚀性能；横缝止水适当后移，利用横缝间水压力减小深孔有压段的孔口应力。The spillway section of TGP is of a concrete gravity type, with total length of 483 m and maximum height of 183 m. In this section, there are 67 flood discharging outlets arranged in 3 levels, including 22 top openings, 23 bottom outlets and 22 diversion bottom outlets. The top openings and bottom outlets are permanent flood discharge facilities. The maximum discharge capacity of the project amounts to 102 500 m 3/s. The spillway dam structure is rather complicated to accommodate 3 levels of large outlets. The closed grout curtain and pumped drainage system in the dam foundation is adopted to decrease the uplift pressure. The transverse joints under El. 110 m will be grouted in order to strengthen the integration of the dam and improve the stress state around the outlets. The pressure section of the bottom outlets is to be lined by steel plate to increase abrasion resistance capability. Water stop in transverse joints is shifted properly towards downstream side in order that the water pressure in the transverse joint will cause the stress intensity around the outlets to be reduced.

关 键 词：结构设计 泄水孔 三峡工程 大坝 泄洪坝 

分 类 号：TV652[水利工程—水利水电工程]