开挖顺序对三峡永久船闸三闸首中隔墩变形机制影响的研究  

STUDY OF EFFECT OF EXCAVATION SEQUENCE ON DEFORMATION MECHANISM OF CENTRAL PIER OF THIRD PERMANENT SHIPLOCK CHAMBER OF THREE GORGES PROJECT

作　　者：程国明[1] 王思敬[1] 

机构地区：[1]中国科学院地质与地球物理研究所工程地质力学重点实验室,北京100029

出　　处：《岩石力学与工程学报》2004年第7期1061-1065,共5页Chinese Journal of Rock Mechanics and Engineering

基　　金：国家重点基础研究发展规划(973)(No.2002CB412702)项目资助课题。

摘　　要：鉴于目前对中隔墩变形机制认识仍不统一,运用数值模拟方法研究了不同开挖顺序对中隔墩变形机制的影响,并进行了岩体参数的敏感性分析。研究结果表明,中隔墩变形的主要影响因素是开挖顺序,中隔墩出现“一边倒”是由南北两侧开挖顺序不对称引起的;F215断层的存在对南侧位移大小有一定影响,但对南侧位移向北影响很小,不可能引起南侧位移向北;中隔墩“一边倒”需要满足一定的刚度和强度条件;中隔墩呈现“一边倒”并不表明其破坏、倒塌的趋势,相反,这种变形方式却表明中隔墩的整体刚度较高,呈弹性表现。研究结果为科学地解释中隔墩变形机制提供了理论依据。There are different points of view about the deformation mechanism of the central pier of the permanent shiplock of the Three Gorges Project. The influences of different excavation sequences on the deformation of the pier are investigated,and parameter sensitivity analysis is made by using FLAC. The numerical results show that the main influential factor for the deformation is the excavation sequence,and the abnormal deformation is caused by asymmetrical excavation sequence at two sides of the pier. It is also found that the existence of the fault F215 cannot result in northward displacement of the south side,and the abnormal inclination cannot occur unless the rock mass of the pier has relatively high stiffness and strength. It may be concluded that the occurrence of the abnormal inclination doesn抰 indicate the failure or collapse of the pier. On the contrary,it demonstrates that the pier has high stiffness and behaves elastically. The results provide a theoretical basis for a rational interpretation of the deformation mechanism of the central pier.

关 键 词：水利工程 三峡永久船闸 中隔墩 变形 数值模拟 

分 类 号：U641.34[交通运输工程—船舶及航道工程]