Page 92 - Water Standards

tionmethodsshallbeado p ted.
7.2.12 Thesu pp ortt yp eforsurroundin grocksofunder g round
p owerhousecavernsma ybedividedintoflexiblesu pp ort , ri g id
su pp ortandcomp ositesu pp ort.Thesu pp ortdesi g nshallcomp l y
withthep rinci p lethatp riorit yisg iventoflexiblesu pp ortwhile
,
takin gri g idsu pp ortassu pp lementar y andp riorit yisg ivento
s y stematicsu pp ortwhiletakin glocalizedstren g thenin gassu p -
p lementar ywiththeuseofrandomsu pp ortifnecessar y and
,
shouldconformwiththefollowin g s :
1 Eitheroneorcombinationofthefollowin gmeasures
suchasshotcrete,steelwiremesh,rockbolt ,anchorcable,
steelarchrib, etc.shouldbeusedfortheflexiblesu pp ort.
2 Whenflexiblesu pp ortalonecanhardl ymeetthestabilit y
re q uirementofsurroundin grocks , thecomp ositesu pp ortformed
b ycombinin gtheflexiblesu pp ortwithreinforcedconcretelinin g
shouldbeused.
3 Theri g idsu pp ortofreinforcedconcretelinin gorcom p osite
su pp ortshouldbeusedforsurroundin grocksofClassⅣ ClassⅤ.
4 Forsectionsorp artsofcavernsunders p ecialg eolo g ical
conditions , theadvancesu pp ortmeasuresuchasconsolidation
,
g routin g concretere p lacement , etc.ma ybeused.
5 Thesu pp ortshouldbedesi g nedascomp ositesu pp ortfor
cavernsre q uiredtobelinedwithreinforcedconcreteduetothe
re q uirementsofo p erationorh y draulics , etc.
7.2.13 Thedesi g nandtechnicals p ecificationsforconstruction
offlexiblesu pp ortofunder g roundp owerhouseshallconform
withGB50086, SL377andSL212.
7.2.14 Thefollowin gstructuralt yp esma ybeselectedforthe
ri g idsu pp ortusin greinforcedconcretestructuresaccordin gtoin-
itialsu pp ortandsurroundin grockconditions :

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