小湾拱坝坝基开挖卸荷松弛效应的有限元分析

›› 2009, Vol. 30 ›› Issue (4): 1175-1180.

小湾拱坝坝基开挖卸荷松弛效应的有限元分析

周华¹，王国进^{1, 2}，傅少君³，邹丽春²，陈胜宏¹

1. 武汉大学水资源与水电工程科学国家重点实验室，武汉 430072； 2. 国家电力公司昆明勘测设计研究院，昆明 650051；3. 武汉大学土建学院，武汉 430072

收稿日期:2008-04-24 出版日期:2009-04-10 发布日期:2011-01-30
作者简介:周华，男，1982年生，博士，主要从事水工结构数值仿真方面的研究。
基金资助:
国家自然科学基金资助项目（No. 50679066）资助。

Finite element analysis of foundation unloading and relaxation effects of Xiaowan Arch Dam

ZHOU Hua¹，WANG Guo-jin ^1,2，FU Shao-jun3，ZOU Li-chun²，CHEN Sheng-hong¹

1. State Key Laboratory of Water Resources and Hydropower Engineering Science, Wuhan University, Wuhan 430072, China； 2. Kunming Institute of Hydropower Investigation-Design and Research, Kunming 650051, China； 3. School of Civil Engineering, Wuhan University, Wuhan 430072, China

Received:2008-04-24 Online:2009-04-10 Published:2011-01-30

摘要/Abstract

摘要：

针对小湾拱坝坝基开挖中出现的卸荷松弛问题，采用三维非线性有限元法对卸荷松弛效应进行了评价。通过松弛方案与未松弛方案计算，对小湾拱坝的应力和位移、屈服区分布以及坝基浅部关键截面的抗剪安全度、点安全度等方面进行了比较分析。研究结果表明，建基面地基松弛后，主要影响低高程局部区域的变形和应力，对拱坝整体变形和应力分布的影响很小；地基松弛后，拱冠梁建基面（953 m高程）坝踵处第一主应力有所增大，坝趾处第三主应力有所减小；拱冠处梁的作用减弱，拱冠梁处距坝踵20 m范围的点安全系数也略有降低；原设计方案在未松弛情况下基本可以满足《混凝土拱坝设计规范》关于建基面抗剪（断）安全系数的要求；坝基松弛后，抗剪（断）安全系数降低明显，与规范规定的要求相差较大，需采取适当的工程措施。该研究成果已为设计决策提供了依据。

关键词: 拱坝, 坝基, 卸荷松弛, 有限单元法

Abstract:

The effects of unloading and relaxation during the excavation of Xiaowan arch dam foundation are evaluated by 3-D nonlinear finite element method. Based on the analysis，the relaxed and un-relaxed cases are compared on the basis of stress, deformation, yield zone and the shear safety factor of critical section in shallow dam foundation. It is found that the relaxed foundation mainly affects the deformation and stress distribution in local section at low elevation, but has little effect on the whole dam. Compared with the un-relaxed case, the first principal stress in dam heel on dam foundation surface(EL.953.0 m) have increased to some extend after the foundation relaxation, while the third principal stress in dam toe decreased appreciably. It is also found that the contribution of cantilever beam has been weakened slightly and the shear safety factor of crown cantilever has a little decrease. The shear safety factor of dam foundation surface in the original design with un-relaxed foundation can basically satisfy the request of “Design Specification for Concrete Arch Dams”; but in the relaxed case it reduced obviously. Therefore proper measures should be taken in order for the improvement. This research has provided a reliable basis for the decision-making.

Key words: arch dam, dam foundation, unloading and relaxation, finite element method

中图分类号:

TV 641

周华，王国进，傅少君，邹丽春，陈胜宏. 小湾拱坝坝基开挖卸荷松弛效应的有限元分析[J]. , 2009, 30(4): 1175-1180.

ZHOU Hua，WANG Guo-jin1,，FU Shao-jun，ZOU Li-chun，CHEN Sheng-hong. Finite element analysis of foundation unloading and relaxation effects of Xiaowan Arch Dam[J]. , 2009, 30(4): 1175-1180.

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