水平和竖向地震作用下土工格栅加固高坝的动力响应分析
|
摘要
由于高土石坝中土工格栅与界面的复杂性,用复合材料法和钢筋代替格栅等方法不能充分反映土工格栅与土体之间相互作用的问题。文章利用FLAC~(3D)有限差分软件中geogrid单元模拟土工格栅及耦合界面,采用修正后的M-C模型模拟坝体材料的非线性;研究在地震荷载作用下对加筋土工格栅的高土石坝的加固效果,进行了三维有限差分化分析;计算结果表明,土工格栅加固高土石坝有助于减小坝体整体位移,增大坝体的安全系数,从而起到整体加固的作用。
Due to the complexity of the geogrid and the interface in the high earth-rock dam, the method that uses geogrid as a composite material or replaces it by steel bar does not fully reflect the interaction between the geogrid and the soil. In this paper, the finite difference software FLAC~(3 D) is used to simulate the geogrid and the coupling interface, and the modified M-C model is used to simulate the nonlinearity of the dam material. Under the seismic load, the reinforcement effect of high geogrid reinforced dam is analyzed, and the three-dimensional finite difference analysis is carried out. The results show that the geogrid reduces the overall displacement of the high earth-rock dam and increases the safety factor of the dam, thus enhancing the overall stability.
Due to the complexity of the geogrid and the interface in the high earth-rock dam, the method that uses geogrid as a composite material or replaces it by steel bar does not fully reflect the interaction between the geogrid and the soil. In this paper, the finite difference software FLAC~(3 D) is used to simulate the geogrid and the coupling interface, and the modified M-C model is used to simulate the nonlinearity of the dam material. Under the seismic load, the reinforcement effect of high geogrid reinforced dam is analyzed, and the three-dimensional finite difference analysis is carried out. The results show that the geogrid reduces the overall displacement of the high earth-rock dam and increases the safety factor of the dam, thus enhancing the overall stability.
引文
[1] 贾金生,袁玉兰,李铁洁.2003年中国及世界大坝情况[J].中国水利,2004(13):25-33.
[2] 陈生水,霍家平,章为民.“5.12”汶川地震对紫坪铺混凝土面板坝的影响及原因分析[J].岩土工程学报,2008,30(6):795-801.
[3] 周世良,刘占芳,王多垠,等.格栅加筋土挡墙数值分析的复合料方法[J].岩石力学与工程学报,2006,25(11):2327-2334.
[4] 杨涛,杨锦忠,石磊,等.土工格栅加筋拓宽路堤有限元分析[J].土木工程学报,2011,44(增刊2):37-40.
[5] 陈育民,徐鼎平.FLAC/FLAC3D基础与工程实例[M].北京:中国水利水电出版社,2009.
[6] 孙书伟,林杭,任连伟.FLAC3D在岩土工程中的应用[M].北京:中国水利水电出版社,2001.
[7] 朱亚林.地震时高土石坝的弹塑性分析和抗震措施研究[D].大连:大连理工大学,2011.
[8] 朱亚林,马驰,李端洲,等.地震作用下高土石坝的弹塑性分析[J].合肥工业大学学报(自然科学版),2016,39(11):1520-1524.
[9] 景海,陈环,王玲娟,等.土工合成材料与土界面作用特性的研究[J].岩土工程学报,2001,23(1):89-93.
[10] 吴刘,文白,周健.土工格栅与土界面作用特性试验研究[J].岩土力学,2009,30(4):965-970.
[11] 刘续.考虑土工格栅粘弹塑性的筋土拉拔界面特性研究[D].杭州:浙江大学,2013.
[12] 杨波,凌天清,张强,等.基于FLAC3D的土工格栅加筋土挡墙数值分析[J].水利水电科技进步,2012,32(1):11-14.
[2] 陈生水,霍家平,章为民.“5.12”汶川地震对紫坪铺混凝土面板坝的影响及原因分析[J].岩土工程学报,2008,30(6):795-801.
[3] 周世良,刘占芳,王多垠,等.格栅加筋土挡墙数值分析的复合料方法[J].岩石力学与工程学报,2006,25(11):2327-2334.
[4] 杨涛,杨锦忠,石磊,等.土工格栅加筋拓宽路堤有限元分析[J].土木工程学报,2011,44(增刊2):37-40.
[5] 陈育民,徐鼎平.FLAC/FLAC3D基础与工程实例[M].北京:中国水利水电出版社,2009.
[6] 孙书伟,林杭,任连伟.FLAC3D在岩土工程中的应用[M].北京:中国水利水电出版社,2001.
[7] 朱亚林.地震时高土石坝的弹塑性分析和抗震措施研究[D].大连:大连理工大学,2011.
[8] 朱亚林,马驰,李端洲,等.地震作用下高土石坝的弹塑性分析[J].合肥工业大学学报(自然科学版),2016,39(11):1520-1524.
[9] 景海,陈环,王玲娟,等.土工合成材料与土界面作用特性的研究[J].岩土工程学报,2001,23(1):89-93.
[10] 吴刘,文白,周健.土工格栅与土界面作用特性试验研究[J].岩土力学,2009,30(4):965-970.
[11] 刘续.考虑土工格栅粘弹塑性的筋土拉拔界面特性研究[D].杭州:浙江大学,2013.
[12] 杨波,凌天清,张强,等.基于FLAC3D的土工格栅加筋土挡墙数值分析[J].水利水电科技进步,2012,32(1):11-14.