土石坝动力离心模型试验颗粒流数值模拟
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摘要
以长河坝离心模型试验为基础,开展颗粒流细观数值模拟研究,分析大坝在不同地震加速度和离心加速度下的动力响应(加速度和位移)和破坏模式,并对长河坝双向振动台模型试验进行了数值模拟分析.数值模拟结果表明:数值模拟规律与离心振动台试验规律基本一致,坝体的地震破坏模式为坝顶局部滑动破坏;同一高程坝坡位置的动力响应大于心墙位置;随着地震加速度峰值的增大,坝体加速度放大系数减小,坝体破坏模式不变;随着离心加速度的增大,坝体加速度放大系数减小,坝顶沉降减小.
The meso-mechanical simulation was performed based on the dynamic centrifugal model tests on Changhe Dam.The dynamic response(acceleration and displacement) and failure modes of Changhe Dam under different earthquakes and centrifugal accelerations were analyzed.The bi-axial shaking table model tests on Changhe Dam were also simulated and analyzed.The simulated results show that the numerical simulations agree with the results of the dynamic centrifugal model tests.The failure mode of dam body caused by earthquakes is the local sliding failure at the dam crest.The response on the dam slope at the same height is larger than that on the core wall.With the increase of the peak value of earthquake acceleration,the magnification coefficient of acceleration decreases,and the failure mode of dam body remains unchanged.With the increase of the centrifugal acceleration,the magnification coefficient of acceleration also decreases,and the settlement of dam crest decreases.
The meso-mechanical simulation was performed based on the dynamic centrifugal model tests on Changhe Dam.The dynamic response(acceleration and displacement) and failure modes of Changhe Dam under different earthquakes and centrifugal accelerations were analyzed.The bi-axial shaking table model tests on Changhe Dam were also simulated and analyzed.The simulated results show that the numerical simulations agree with the results of the dynamic centrifugal model tests.The failure mode of dam body caused by earthquakes is the local sliding failure at the dam crest.The response on the dam slope at the same height is larger than that on the core wall.With the increase of the peak value of earthquake acceleration,the magnification coefficient of acceleration decreases,and the failure mode of dam body remains unchanged.With the increase of the centrifugal acceleration,the magnification coefficient of acceleration also decreases,and the settlement of dam crest decreases.
引文
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[2]ARULANANDANK,ANANDRAJAHA,ABGHARI A.Centrifuge modeling of soil liquefaction susceptibility[J].Journal of GeotechnicalEngineering,1983,109(3):281-300.
[3]章为民,日下部治.砂性地基地震反应离心模型试验研究[J].岩土工程学报,2001,23(1):28-31.(ZHANG Wei-min,KUSAKABE O.Dynamic centrifuge model test of sandylayer[J].Chinese Journal of Geotechnical Engineering,2001,23(1):28-31.(inChinese))
[4]王年香,章为民.混凝土面板堆石坝动态离心模型试验研究[J].岩土工程学报,2003,25(4):504-507.(WANG Nian-xiang,ZHANG Wei-min.Dynamic centrifuge model test for concrete face rockfill dam[J].Chinese Journal of Geotechnical Engineering,2003,25(4):504-507.(in Chinese))
[5]王年香,章为民,顾行文,等.长河坝动力离心模型试验研究[J].水力发电,2009,35(5):67-70.(WANG Nian-xiang,ZHANGWei-min,GUXing-wen,et al.Dynamic centrifuge model test for Changhe dam[J].Water Power,2009,35(5):67-70.(in Chinese))
[6]杨贵,刘汉龙,陈育民,等.堆石料动力变形特性的尺寸效应研究[J].水力发电学报,2009,28(5):121-126.(YANG Gui,LIUHan-long,CHENYu-min,et al.Researchonsize effect of rock-fill materials on dynamic deformation property[J].Journal of HydroelectricEngineering,2009,28(5):121-126.(in Chinese))
[7]周健,王家全,曾远,等.颗粒流强度折减法和重力增加法的边坡安全系数研究[J].岩土力学,2009,30(6):1549-1554.(ZHOUJian,WANGJia-quan,ZENG Yuan,et al.Slope safety factor by methods of particle flowcode strength reduction and gravityincrease[J].Rock and Soil Mechanics,2009,30(6):1549-1554.(in Chinese))
[8]CAI M,KAISER P K,MORIOKA H,et al.FLAC/PFC coupled numerical simulation of AEin large-scale underground excavations[J].International Journal of Rock Mechanics and Mining Sciences,2007,44:550-564.
[9]BARDETJ P,PROUBETJ.Shear-band analysis in idealized granular material[J].Journal of Engineering Mechanics,ASCE,1992,118(2):397-415.
[10]章为民.长河坝水电站砾石土心墙堆石坝筑坝料静动力试验报告[R].南京:南京水利科学研究院,2006.
[11]SL203—97水工建筑物抗震设计规范[S].
[12]孔宪京,刘君,韩国城.面板堆石料模型动力破坏试验与数值仿真分析[J].岩土工程学报,2003,25(1):26-30.(KONG Xian-jing,LIUJun,HANGuo-cheng.Dynamic failure test and numerical simulation of model concrete-faced rockfill dam[J].Chinese Journalof Geotechnical Engineering,2003,25(1):26-30.(in Chinese))
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