修建在砂砾岩地基上的拱坝应力分析.pdfVIP

第 25 卷 第 8 期 岩石力学与工程学报 Vol.25 No.8 2006 年 8 月 Chinese Journal of Rock Mechanics and Engineering Aug .，2006 修建在砂砾岩地基上的拱坝应力分析 胡 昱，刘光廷，李鹏辉 (清华大学 水利水电工程系，北京 100084) 摘要：在砂砾岩基础上修建拱坝，坝体的垂直方向和顺河向变形是否过大，是关系到拱坝安全甚至能否修建的重 要因素。砂砾岩受力变形有两个特点：一是在较低应力条件下，仍有较大的不可恢复变形；二是不同应力条件下， 岩石的切线变形模量不同。通过分析现场原位变形试验，构造出能够反应出砂砾岩受力变形特点的非线性本构模 型，并应用到实际工程中，分析其对坝体变形、应力的影响，可为工程规划和设计提供一定的参考依据。 关键词：水利工程；砂砾岩；拱坝；非线性本构方程；原位试验 中图分类号：TV 223 ；TV 644 文献标识码：A 文章编号：1000 –6915(2006)08 –1569 –06 STRESS ANALYSIS OF ARCH DAM BUILT ON SANDY GRAVEL FOUNDATION HU Yu ，LIU Guangting ，LI Penghui (Department of Hydraulic and Hydropower Engineering ，Tsinghua University，Beijing 100084，China) Abstract ：As for the Wuyi Hydraulic Project on the Dina River in Xinjiang Uygur Autonomous Region of China ， the study shows that an arch dam will have a larger economical advantage over an earth dam for the spillway；and drain holes can be emerged into the dam body. No more separate constructions such as floodway，which is a necessary part for earth dams ，are required. However，another key issue appears in the determination of the possibility for building an arch dam on sandy gravel ：the deformation of the dam in both vertical and horizontal directions ；and the corresponding stress distribution in the some situations can exert a great threat to the arch dam safety. The stress-displacement relation of sandy gravel has the two features as follows：(1) the irrecoverable deformation cannot be ignored even in lower stress status ；and (2)