复杂地形对面板坝面板应力和变形的影响分析
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摘要
某混凝土面板堆石坝坝高144m,河谷地形复杂。采用三维非线性有限元法,建立了坝体和坝基的三维有限元模型,模拟了大坝填筑施工过程和水库蓄水过程,分析了运行期面板的应力变形及周边缝的变位特性,研究了复杂地形条件对该坝面板应力和变形的影响。计算表明:该混凝土面板堆石坝的面板应力受地形的影响较大,与坝体断面几何形态密切相关。左岸次堆石区变形大,面板应力较大,而右岸岩体的支撑作用显著,面板应力较小。右岸陡坡处及左右岸变坡处周边缝的变形较大。
A CFRD with the height of 144 meters situates in a river valley where the topography is complex.With the 3-D FEM model of the dam, the filling process of the dam and the storage process of the reservoir have been simulated, the deformation and the stress of the face slab and the strain of the peripheral joint have been analyzed, and the influence of the complex topographical condition on this dam has been studied.The research shows that, the stress of this dam′s face slab is largely influenced by the topography and is closely related with the geometry shape of the cross section.The stress of the face slab is bigger in the left bank because of the large secondary rock-fill zone and its deformation, while the rock mass′s support function is remarkable in the right bank and thus the stress of the face slab is smaller.The strain of the peripheral joint is bigger on the steep slope of the right bank, as well as in those places where the slope changes in both banks.
A CFRD with the height of 144 meters situates in a river valley where the topography is complex.With the 3-D FEM model of the dam, the filling process of the dam and the storage process of the reservoir have been simulated, the deformation and the stress of the face slab and the strain of the peripheral joint have been analyzed, and the influence of the complex topographical condition on this dam has been studied.The research shows that, the stress of this dam′s face slab is largely influenced by the topography and is closely related with the geometry shape of the cross section.The stress of the face slab is bigger in the left bank because of the large secondary rock-fill zone and its deformation, while the rock mass′s support function is remarkable in the right bank and thus the stress of the face slab is smaller.The strain of the peripheral joint is bigger on the steep slope of the right bank, as well as in those places where the slope changes in both banks.
引文
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[4]陈明致,金来均.坝工丛书:堆石坝设计[M].北京:水利出版社,1981.
[5]钱家欢,殷宗泽.土工原理与计算(第二版).[M].北京:中国水利出版社,1994.
[6]徐泽平.混凝土面板堆石坝应力变形特性研究[M].郑州:黄河水利出版社.2005.
[7]沈振中,陈小虎,盛蓉.岸坡台地对混凝土面板堆石坝变形和应力的影响[EB/OL].http://www.paper999.com/paper-pp-bq54/,2006-07-10.
[8]徐泽平,邵宇,梁建辉.狭窄河谷中高混凝土面板堆石坝应力变形特性研究[J].水力发电,2004,(A01):97-103.
[9]陈慧远.土石坝有限元分析[M].南京:河海大学出版社,1988,(01).
[10]顾淦臣,黄金明.混凝土面板堆石坝的堆石本构模型与应力应变分析[J].水力发电学报,1991,(01).
[11]沈珠江.堆石料的数学模型及混凝土面板堆石坝的计算[R].南京:南京水利科学研究院,1990.
[12]Goodman R F.Taglor R L and Brekke T L.A Model for the Mechanics of Jointed Rock,J.Soil Mech.And Found.Div.ASCE,1968.
[13]Desai C S and Zaman M M.Thin-Layer-Element for Interface and Joints.Int J Numer.Anal.Methodsin Geomech.,1984.
[14]刘浩吾.混凝土面板堆石坝接缝止水的实验和分析[J].岩土工程学报,1995,17(5).
[15]顾淦臣.土石坝地震工程[M].南京:河海大学出版社,1989.
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