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1、StudiesonLoosenedZoneofSurroundingRockUndergroundPowerhouseCavitiesforJinpingIHydropowerStationinConstruction基金项目：长江科学院中央级公益性科研院所基本科研业务费资助项目(No2010-2-8);国家自然科学基金重点项目雅砻江水电开发联合基金（50639090）;水利部公益性行业科研专项项目(201001009)作者简介：黄志鹏（1965-），男，硕士，高级工程师，1997年毕业于重庆建筑大学岩土工程专业，现任水利部岩土力学与工程重点
2、实验室副总工程师，主要从事岩土工程试验、研究及安全监测分析等工作.HUANGZhi-PengChongqingRockFoundationResearchCentre,KeyLaboratoryofGeotechnicalMechanics＆EngineeringofMinistryofWaterResources,YangtzeRiverScientificResearchInstitute,YangtzeRiverScientificResearchInstitute.Chongqing,China.zhipenghuang@163.co
3、mZHOUJiang-PingErtanHydroelectricDevelopmentLt.Company,Chengdu,China,zhoujiangping@ehdc.com.cnZHANJing-ShengChongqingRockFoundationResearchCentre,KeyLaboratoryofGeotechnicalMechanics＆EngineeringofMinistryofWaterResources,YangtzeRiverScientificResearchInstitute,Wuhan430010,C
4、hina;YangtzeRiverScientificResearchInstitute,Chongqing,China.512951760@qq.comLIWei-shuChongqingRockFoundationResearchCentre,KeyLaboratoryofGeotechnicalMechanics＆EngineeringofMinistryofWaterResources,YangtzeRiverScientificResearchInstitute,Wuhan430010,China;YangtzeRiverScien
5、tificResearchInstitute,Chongqing,China.lws_lwslws@163.comAbstract．ThispaperintroducesthetestresultsofloosenedzoneofsurroundingrockundergroundpowerhousecavitiesforJinpingIHydropowerStationinconstructionandtheresultsareanalyzedandstudied.Loosenedzoneofsurroundingrockscaleandd
6、istributionareinfluencedbygeologicalconditionsandexcavation,Loosenedzoneofsurroundingrockinupstreamanddownstreamsidewallobviousasymmetry.Downstreamsideupperandupstreamsidemid-lowerofmainpowerhouseisbigger;upstreamside-wallbottomanddownstreamside-wallmid-upperofmaintransform
7、erchamberislarge.Loosenedzoneofsurroundingrockandwavevelocitychangehasobvioustime-relatedfeature,loosenedzonedevelopmentandrockwavedecreaseisfasterexcavationearly;afterexcavation,itisstoppedgradually,but,finishthisprocessneedssixmonths.Wavevelocitydecreasedegreeofsurroundin
8、grockrapiddeclinereducedwithdepthincrease,superficialwavevelocityofsurroundingrock
