无锡马山抽水蓄能电站堆石料工程特性平行试验研究
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摘要
通过马山抽水蓄能电站坝体堆石料平行试验研究,认为三种堆石料两次大型三轴剪切试验、侧限单向压缩试验和渗透试验的结果都很接近;堆石料的应力应变关系符合邓肯-张双曲线模型,低围压下会发生剪胀;其压缩性比较低,卸荷回弹量很小,基本都是塑性变形;堆石料的渗透规律基本满足达西定律。堆石料平行试验结果验证了材料的性质能满足工程设计的要求,也说明材料性质的稳定性、试验方法的可行性和试验仪器的准确性均比较令人满意。
A series of parallel tests are carried out on the rockfills of Mashan pumped storage power station in the city of Wuxi. It is found that the results of large scale triaxial compression tests,confined-uniaxial compression tests and seepage tests for twice on three kinds of rockfills are very closer. The stress-strain relationships of three rockfills are consistent with the Duncan-Chang hyperbolic model,and the volume dilates under lower confined pressures. The low compressibility of rockfills is due to their stiffness. The bounce is very little when unloading,so it is thought that the compression deformation is basically plastic. Additionally,the permeabilities for three rockfills accord with Darcy Law. Therefore,the test results show that the rockfill materials satisfy the design requests of engineering,and also validate that the stable properties of rockfills,the feasibility of experiment methods and the accuracy of apparatuses are all accepted.
A series of parallel tests are carried out on the rockfills of Mashan pumped storage power station in the city of Wuxi. It is found that the results of large scale triaxial compression tests,confined-uniaxial compression tests and seepage tests for twice on three kinds of rockfills are very closer. The stress-strain relationships of three rockfills are consistent with the Duncan-Chang hyperbolic model,and the volume dilates under lower confined pressures. The low compressibility of rockfills is due to their stiffness. The bounce is very little when unloading,so it is thought that the compression deformation is basically plastic. Additionally,the permeabilities for three rockfills accord with Darcy Law. Therefore,the test results show that the rockfill materials satisfy the design requests of engineering,and also validate that the stable properties of rockfills,the feasibility of experiment methods and the accuracy of apparatuses are all accepted.
引文
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[10]DL/T5016—1999,混凝土面板堆石坝设计规范[S].
[2]孔宪京,贾革续,邹德高,等.微小应变下堆石料的变形特性[J].岩土工程学报,2001,23(1):32-37.Kong X J,Jia G X,Zou D G,et al.Deformation characteristics of rockfill at small strains[J].Chinese Journal of Geotechnical Engineering,2001,23(1):32-37.
[3]沈珠江,徐刚.堆石料的动力变形特性[J].水利水运科学研究,1996,(2):143-150.Shen Z J,Xu G.Deformation behavior of rock materi-als under cyclic loading[J].Journal of Nanjing Hy-draulic Research Institute,1996,(2):143-150.
[4]刘萌成,高玉峰,刘汉龙,等.粗粒料大三轴试验研究进展[J].岩土力学,2002,23(2):217-221.Liu M C,Gao Y F,Liu H L,et al.Development of study on a large scale triaxial test of coarse-grained materials[J].Rock and Soil Mechanics,2002,23(2):217-221.
[5]吴兴征,栾茂田,李相崧.复杂加载路径下堆石料动力本构模型及数值模拟[J].世界地震工程,2001,17(1):9-14.Wu X Z,Luan M T,Li X S.Bounding-surface hy-poplastic medel for rockfill materials under complex loading paths and its verification[J].World Informa-tion on Earthquake Engineering,2001,17(1):9-14.
[6]岑威钧.堆石料亚塑性本构模型及面板堆石坝数值分析[D].南京:河海大学,2005.Cen W J.Hypoplastic modeling for rockfill and nu-merical analysis of concrete face rockfill dam[D].Nanjing:Hohai University,2005.
[7]HoltzW Z,Gibbs H J.Triaxial shear tests on pervi-ous gravelly soils[J].Journal of Soils Mechanics and Foundation Division,American Society of Civil Engi-neering,1956,82(1):1-22.
[8]王继庄.粗粒料的变形特性和缩尺效应[J].岩土工程学报,1994,16(4):90-95.
[9]刘汉龙,高玉峰.无锡马山抽水蓄能电站面板堆石坝坝体填筑料试验研究报告[R].南京:河海大学岩土工程研究所,2004.Liu H L,Gao Y F.Research report on rockfill mate-rials for concrete face rockfill dam of Mashan pumped storage power station in Wuxi[R].Nanjing:Geotech-nical Research Institute,Hohai University,2004.
[10]DL/T5016—1999,混凝土面板堆石坝设计规范[S].
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