复杂加载条件对高面板堆石坝力学行为的影响
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摘要
针对高面板堆石坝因采用坝体分区填筑和面板分期浇筑互相交错的复杂施工方式使得高面板坝呈现出复杂的力学行为这一问题,借助某拟建高面板堆石坝,采用三维非线性有限元法对其进行复杂加载条件下的结构仿真分析。结果表明:复杂加载条件下坝体应力变形等力学行为均在合理范围之内,但坝体沉降极值较大坝全断面施工时有约12%的减小量;分二期浇筑的面板在竣工期下部一期面板凸向上游,容易引起脱空现象,需引起注意。
The high concrete face rockfill dams(CFRDs) usually adopt complex construction mode,that is,filling of zoned dam body and placing of concrete face slabs in stages.Thus,the high CFRDs exhibit complex mechanical behaviors.Based on a high CFRD to be constructed,the 3D nonlinear finite element method was applied to the structural simulation under complex loading conditions.The results indicate that the stress and deformation behaviors of the dam under complex loading conditions are reasonable.Compared with the behaviors of full section filling of dam body,the maximum settlement of the dam has a decrease of about 12%.The first stage face will be convex to the upstream at the completion stage under the placing of the concrete face slabs in two stages,which will cause separation between the concrete slab and the cushion layer,and it should be noticed.
The high concrete face rockfill dams(CFRDs) usually adopt complex construction mode,that is,filling of zoned dam body and placing of concrete face slabs in stages.Thus,the high CFRDs exhibit complex mechanical behaviors.Based on a high CFRD to be constructed,the 3D nonlinear finite element method was applied to the structural simulation under complex loading conditions.The results indicate that the stress and deformation behaviors of the dam under complex loading conditions are reasonable.Compared with the behaviors of full section filling of dam body,the maximum settlement of the dam has a decrease of about 12%.The first stage face will be convex to the upstream at the completion stage under the placing of the concrete face slabs in two stages,which will cause separation between the concrete slab and the cushion layer,and it should be noticed.
引文
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[3]相彪,张宗亮,迟世春.复杂应力路径下堆石料本构关系研究[J].岩土力学,2010,31(6):1716-1722,1728.
[4]岑威钧,任旭华,李启升.复杂地形条件下高面板堆石坝的应力变形特性分析[J].河海大学学报:自然科学版,2007,35(4):452-455.
[5]DUNCAN J M,CHANG C Y.Nonlinear analysis of stress andstrain in soils[J].Journal of Soil Mechanics and FoundationDivision,ACSE,1970,96(5):1629-1653.
[6]DUNCAN J M,BYRNE P,WONG K S,et al.Strength,stress-strain and bulk modulus parameters for finite element analysisof stresses and movements in soil masses[R].Berkrly:University of California,1980.
[7]姜弘道.水工结构工程与岩土工程的现代计算方法及程序[M].南京:河海大学出版社,1992.
[8]岑威钧,朱岳明,罗平平.面板堆石坝有限元仿真计算及参数敏感性研究[J].水利水电科技进展,2005,25(4):16-25.
[9]顾淦臣,黄金明.混凝土面板堆石坝的堆石本构模型与应力变形分析[J].水力发电学报,1991(1):12-24.
[10]GOODMAN R E,TAYLOR R L,BRECKE T L.A model forthe mechanics of jointed rock[J].Journal of Soil Mechanicsand Foundation Division,ASCE,1968,94(3):637-659.
[11]顾淦臣.钢筋混凝土面板堆石坝非线性有限元静动力分析:“七.五”国家科技攻关项目报告[R].南京:河海大学,1990.
[12]顾淦臣,沈长松,岑威钧.土石坝地震工程学[M].北京:中国水利水电出版社,2009.
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