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1TheappendixJengineeringgeologyclassificationofsurroundingrockJ.0.1Theengineeringgeologicclassificationofsurroundingrockcanbedividedintopreliminaryclassificationanddetailedclassification.Theclassificationresultscanbeusedtoevaluatethestabilityofsurroundingrockandasthebasisofsupporttype.Classificationofsurroundingrockshallconformtotable0.1.JTableJ.0.1EngineeringgeologyclassificationofsurroundingrockJ.0.2Apreliminaryclassificationofsurroundingrockismainlyonthebasisofrocktypeandrockmassstructuretypeortheintegritedegree,rockmassissuitablefortheplanningandpreliminaryfeasibilitystudyphase,andshouldbeinaccordancewiththetablebelow.SurroundingRocktypeStabilityevaluationofsurroundingrockSupporttypeⅠStability:stableforalongtimeNoneedsupportingoruseanchoratsomeplaceorfillingwithconcrete.Bigspan,shotcrete,systemanchoringboltandsteelmesh.ⅡStableonthewhole,theoverallstabilityofsurroundingrock,won'tproduceplasticdeformationandlocalcombinationblockinstabilitymaybeproduced.ⅢStabilityispooratSomeplace:thestrengthofsurroundingrockisinsufficient,plasticdeformation,mayproduceatsomeplace,landslidesordeformationmaybeproducedwhenthereisnotsupporting.Theintactsoftrockmaybeshort-terminstabilityShotcrete,systemanchoringboltandsteelmesh,forthebigspancase,itshouldbestrengthentheflexibleandrigidsupporting.ⅣUnstable:thestabilityofsurroundingrockisshort-time,largerdeformationanddamagecanoccur.Shotcrete,systemanchoringboltandsteelmesh,forthebigspancase,strengthentheflexibleandrigidsupportingorpourconcretelining.ⅤVerypoorstability:thesurroundingrockcan'tkeepstabilityatshort-term.deformationandfailurewilloccurseriously.2TableJ.0.2PreliminaryclassificationofsurroundingrockRocktypesstructuraltypesofrockmassdegreeofrockintegritypreliminaryclassificationofsurroundingrockclassesinstructionHardrockTheintegratestructureorthethicklayeredstructureintegrityⅠ、ⅡThehardrock(Rb60)isⅠ,(when60Rb30)isⅡBlockystructurerelativeintegrityⅡ、ⅢThehardrock(Rb60)isⅡ,(when60Rb30)isⅢ.SubmissivestructureⅡ、ⅢInthickbeddedormiddle-thicklayeredstructureⅡ、ⅢInterbreedingstructureⅢ、ⅣAxisholelessthan30degreeAnglewiththestrikeofthestrata,4class.lamellarstructureIntegrityispoorⅢ、Ⅳwhenrockishomogeneous,andthereisnoweakinterlayer,ⅢclassmosaicstructureⅢ---BlockcrackstructureⅣ---CataclasticstructureRelativelyBrokenrockⅣ、ⅤWhentherearegroundwater,ⅤclassFragmentalorfragmentstructurebrokencompletelyⅤ---SoftrockTheintegratestructureorthethicklayeredstructureintegrityⅢ、Ⅳwhen30Rb15andnogroundwaterisⅢclass.whenithasgroundwater,Ⅳclass.when15Rb5Soft,ⅣclassblockystructureorsubmissivestructurerelativeintegrityⅣ、ⅤWhenthereisnogroundwater,Ⅳclass;whenithasgroundwater,Ⅴclassthickbeddedormiddle-thicklayeredstructureorinterbreedingstructurelamellarstructureorblockystructureIntegrityispoorⅣ、Ⅴwhen15Rb5softandnogroundwater;ⅣclassCataclastictextureRelativelybrokenrockⅣ、ⅤbrokenstructureorfragmentstructurebrokencompletelyⅤ----3J.0.3Thedeterminationofrocktypes,shouldcomplywiththetableJ.0.3.TableJ.0.3TheclassificationofrocktypesrocktypesHardRockSoftRockHardRockMidHardRockLittleSoftRockSoftRockSaturateduniaxialcompressivestrengthofrockRc(Mpa)Rc6060≥Rc3030≥Rc1515≥Rc5J.0.4Thedeterminationofrockmassintegraldegree,shouldcomplywiththetableJ.0.4TableJ.0.4ThedeterminationofrockmassintegraldegreeIntegraldegreeofrockmassIntegralRelativelyintegralLowintegralLittlecrushCrushGroupNumberofstructuralplanedevelopment1~21~22~32~32~33disorderlyStructuralplanespacing100100~5050~3030~101010-ThedevelopmentdegreeofstructureplaneNoslightly-developedMedium-developedrelativelydevelopedDevelopedHighdeveloped-Note:StructuralplanespacingmeanstheaveragevalueJ.0.5ThedeterminationofrockmassstructuraltypeshouldcomplywithappendixN.J.0.6Detailedclassificationofsurroundingrockshouldbetocontroltherockstrength,rockmassintegrityofthesurroundingrock,structurestate,groundwater,andmainstructuralplaneoccurrenceoverallratingofthesumofthefivefactorsaredividedintobasiccriterion,itismainlyusedforfeasibilitystudy,detaildesignstage,biddingandconstructionandshallcomplywiththeprovisionsofthetable.TableJ.0.6DetailedclassificationofsurroundingrockofundergroundcavernSurroundingrocktypeOverallratingofsurroundingrockTStressratioofsurroundingrockstrengthSⅠT854Ⅱ85≥T654Ⅲ65≥T452Ⅳ45≥T252ⅤT≤25-Note:ForⅠ、Ⅱ、Ⅲ、Ⅳtypes,whenthestressratioislessthantheabove,thentherocktypecorrespondinglowerlevel.J.0.7Thestrength-stressratio,S,maybeobtainedbythefollowingequation(J.0.7):4(J.0.7)Where:Rb—Saturateduniaxialcompressionstrengthofrock(MPa);Kv—Integritycoefficientofrockmass,i.e.:squareofratiooflongitudinalwavevelocityofrockmasstothatofrocktherein;σm—max.principlestressofsurroundingrock(MPa),ifthereisnomeasureddataavailable,itmaybereplacedbyself-weightstress.J.0.8Theratingsoffivefactorsinthedetailedclassificationshallcomplywiththefollowingstipulations.1.TheratingsofrockstrengthshallcomplywithTableJ.0.8-1.TableJ.0.8-1RatingofrockstrengthRockstrengthtypeHardrockSoftRockStiffModeratelystiffModeratelyweakWeakSaturateduniaxialcompressionstrengthRb(MPa)Rb6060≥Rb303