the 2bdesign 2bof 2bthree 2bgorges 2bhydropower 2bstation

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Received 18 July 2011 The design of Three Gorges Hydropower Station Zhou ShudaXie Hongbing Changjiang Institute of SurveyPlanningDesign and ResearchChangjiang Water Resources CommissionWuhan 430010, China AbstractUsing physical model and numerical simulation techniquessome technical problems were studied systemati- callyincluding layout of power stationmeasures of sediment and floating debris dischargingtypes of intakeembed- ded types of spiral caselayout of underground powerhouse tunnel group and block reinforcementIt was optimal in technique and economy with the arrangement of powerhouse at the dam- toe of both banks underground powerhouse in the right bankas well as the intake with a single and small orificeThe sediment and debris problems could be solved with disperse sediment ejection and floating debris discharging holesWith the adoption of techniques for spiral cases such as heat and pressure preservationcushion layer and combined embeddingthe stable operation of generating units can be guaranteedThe arrangement of tailrace tunnel with sloping ceiling was better than that of tailrace surge tankThe technical requirements related to the embedding type of spiral case were proposedThe reinforcement of huge unfa- vorable blocks was discussed and the new idea for block reinforcement using anti- sliding piles and normal compressive stress of structural plane was put forwardKey wordsThree Gorges Power Stationlayoutsediment and floating debris dischargingspiral case embeddingshallow embedmentblock reinforcement 1 Introduction The general layout of Three Gorges Project TGPis as followflood discharge dam monolith in the middle of river bedpowerhouse at dam- toe and powerhouse monolith on two sides of the river channel ship lift and ship lock on the left bankand underground powerhouse in the right bankThe powerhouse structure is one of the three biggest structures of the Three Gorges Project and is equipped with 32 turbine generator units with a unit capacity of 700 MW and total capacity of 22 400 MWIt is the biggest hydropower station in the world with annual utilization hours of installing capac - ity of about 4 000 h and average annual energy out - put of 880×10 kW· Its construction has obvious significance for increasing clean energy proportion and promoting social and economic development for China 2 General layout of power station structure At the dam site of TGPthe river valley is openand the river bed and overbank can meet the layout re- quirements of flood discharge monolithpowerhouse monolith and powerhouse at dam- toeThe bedrock of the constructions is complete and strongwhich is favor- able to dam constructionIn the demonstration stage comparison of general layout schemes of power station structures was researchednamelypowerhouse at dam- toe at two banks underground powerhouse in the right bankpowerhouse at dam- toe of the left bankoverflow powerhouse and underground powerhouse in the right bankpowerhouse at dam- toe of the left bank two- row powerhouse of the right bankFor the schemescomprehensive technical and economic comparison was conducted in aspects of lay- out coordinationflood discharge safety staged con- struction conditionpowerhouse complexity construc- tion difficulty operation conditionconstruction period and investmentFinally the scheme of powerhouse at dam- toe of two banks underground powerhouse in the right bank was adopted Fig1). 1) Power station at dam- toeThe powerhouse struc- ture of the two banks consists of dam- type intakepres- sure penstockmain powerhouseupstream and down- stream auxiliary powerhousestail channel and front area of the plant.14 generators units are installed in the left power station with dimension of 634. ×68 upper part 39 )×94. length ×width × height ); corre- spondingly, 12 generator units are installed in the right power station with dimension of 567. ×68 upper part 39 ) ×94. length × width × height ). The 6 6 Engineering Sciences

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The 2bdesign 2bof 2bThree 2bGorges 2bHydropower 2bStation

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  • Received July

    The design of Three Gorges Hydropower Station

    Abstract - - - - - Key words

    1Introduction - - -

    2General layout of power station structure - - -

    - - - - - - - - - - - - - -

    66

  • -

    Fig1 Layout of power station structures - - - - 3Facilities of sediment release and floatingdebris release of power station

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    76

  • Fig2 Profile of power station at dam-toe unit of elevation m dimensional unit cm

    Fig3Profile of flow channel of underground power stationunit of elevation m dimensional unit cmsediment release for - - - - -

    - 86

  • - - - 4Layout of powerhouse at dam-toe

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    - - - - - - - - - - - 5Some technical concerns for design ofpower station structure51 Determination of powerhouse intake type - - - - - -

    96

  • Fig4Profile of flow channel of underground power stationunit of elevation m dimensional unit cm52Key technologies for spiral case embedding

    manners of extra-large hydropower station - - - - - -

    - - - D HD HD D - HD - - - - - - - - - - - - - 07

  • - - - - - - - - - - - - - -

    - - - - - - - - - - - - - Table 1Technology comparison of 3 spiral case embedding manners

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    53Combined bearing of abutment monolithpowerhouse and dam

    17

  • - - - - - - - - - - - 54Countermeasures for shallow-embedded

    underground powerhouse - - - - - - - - - - -

    - - - - - - - - - - - - - - - - - - - - - -- - - - 27

  • - - - 55Reinforcement of huge rock blocks of

    underground powerhouse - - - - - - - - -

    - - - - - 6Conclusion

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    Author -

    37