拱坝坝肩稳定性的地质力学模拟研究.pdf

第23卷第10期岩石力学与工程学报23(6)：1670～1676
2004年5月ChineseJournalofRockMechanicsandEngineeringMay，2004

拱坝坝肩稳定性的地质力学模拟研究*

李天斌1，2

(1成都理工大学环境与土木工程学院成都610059)(2地质灾害防治与地质环境保护国家专业实验室成都610059)

摘要为了论证和评价澜沧江小湾水电站拱坝坝肩岩体的稳定性，特别是软弱面(带)对坝肩稳定性的影响，采用相
似材料三维嵌合块体地质力学模型试验，对坝肩岩体在开挖、工程荷载和超载条件下的变形破坏特征以及破坏机
制进行研究，并评价坝肩岩体的稳定安全度和超载能力。
关键词岩体力学，模型试验，坝肩稳定性，地质力学模拟，小湾水电站
分类号TV642.4文献标识码A文章编号1000-6915(2004)10-1670-07

GEOMECHANICALMODELINGSTUDYONSTABILITY
OFARCHDAMSHOULDER

LiTianbin1，2
(1CollegeofEnvironmentandCivilEngineering，ChengduUniversityofTechnology，Chengdu610059China)
(2NationalLabofGeohazardPreventionandGeoenvironmentPreservation，Chengdu610059China)

AbstractInordertodemonstrateandevaluatethestabilityofrockmassesforthearchdamshouldersof
XiaowanpowerstationonLangcangRiverinChina，athree-dimensionalgeomechanicalmodeltestwasconducted
tostudythefeaturesandmechanismofdeformation-failureoftherockmassesofrightdamshoulderunderthe
conditionofexcavation，designedloadandoverload，andtoevaluateitsstabilityandoverloadingcapacity.The
testresultprovesthatattentionsshouldbepaidtothepartialstabilityoftheslopeattheupperreacheswith
excavation.Underdesignedload，thereisn’tanycrackingintherockmassesandthecompresseddeformationof
theweakzonesisrestrictedinthedistributionrangeofaccessionalstresscausedbydesignedload.Whentheload
isexceededuptothreetimes，theminutefissuresbegintoappearattheupperreachesofthedamfoundation.The
stabilityofthedamshoulderismainlycontrolledbythedeformationofweakzonesandthedeformation-failure
processofthedamshouldercanbedescribedby3stages，namely，beginningcrackofdamfoundation，compressed
crackofdamshoulderandlargedeformationofdamshoulder.Thereissufficientsafetystorageinthedam
shoulder’srockmassesbecauseitssafetydegreesunderthenormalcaseandtheinstabledeformationare3.0and
7.0，respectively.
Keywordsrockmechanics，modelingtest，stabilityofdamshoulder，geomechanicalmodeling，Xiaowanpower
station

南涧县交界部位，即澜沧江与其支流黑惠江交汇口
1前言以下约3.85km处的河段上。该水电站坝型为混凝
土双曲拱坝，坝高达292m。
澜沧江小湾水电站位于云南省西南部凤庆县与坝区河流由北向南，河谷狭窄，呈“V”字形

2003