WhatWhyHowWho
怎么阅读
ForExample
① [Duringthe feasibilityandpreliminary designstagesofaproject,when
very little detailed information on the rock mass and its stress and hydrologic
characteristicsisavailable],theuseofarockmassclassificationschemecanbeof
considerable benefit.② Atits simplest, this may involve using the classification
schemeasacheck-listtoensurethatallrelevantinformationhasbeenconsidered.
③ At the other endofthespectrum,oneormorerockmassclassificationscheme
canbe used to build up apictureofthecompositionandcharacteristicsofarock
massto provide initial estimates of support requirements,and to provide
estimatesofstrengthanddeformationpropertiesoftherockmass.
① It is important to understandthattheuseofarockmassclassification
schemedoesnot ( and can not ) replacesome of the more elaborate design
procedures.However,② theuseofthesedesignproceduresrequiresaccessto
relativelydetailedinformationoninsitustress,rockmasspropertiesandplanned
excavationsequence,none of which may be available at an early stage in the
project.③ Asthis information becomesavailable,theuse of the rock mass
classificationschemesshouldbeupdatedandusedinconjunctionwithsitespecific
analyses.
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