坝料动残余变形特性试验
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摘要
为研究筑坝材料的动残余变形特性,在大型动力三轴仪上进行了动残余变形试验.试验结果表明:残余体积变形随围压和动应力比的提高而增大,固结应力比(或应力水平)对残余体积变形的影响不大;残余剪切变形随围压和动应力比的提高而增大,受固结应力比的影响较大,随固结应力比的提高而增大.为反映不同固结应力比对残余剪切变形的影响,在沈珠江动残余变形模型的基础上提出了经验修正公式,讨论了残余剪切变形的影响因素,分析了小于5 mm粒径颗粒含量对动残余体积变形的影响.
Tests were performed to investigate the dynamic residual deformation characteristics of dam materials by use of a large scale triaxial test apparatus. The results show that the dynamic residual volume deformation increases with the increase of confining pressure and dynamic stress ratio.The consolidated stress ratio(or stress level) has little effect on the residual volume deformation. The dynamic residual shear deformation increases with the increase of confining pressure and dynamic stress ratio,and it is greatly influenced by the consolidated stress ratio and increases with the increase of the consolidated stress ratio.A modified formula based on Shen Zhu-jiang's model was proposed to depict the effect of various consolidated stress ratios on the residual shear deformation.The influencing factors for the residual deformation were discussed.The effect of content of particles smaller than 5 mm on the dynamic residual volume deformation was analyzed.
Tests were performed to investigate the dynamic residual deformation characteristics of dam materials by use of a large scale triaxial test apparatus. The results show that the dynamic residual volume deformation increases with the increase of confining pressure and dynamic stress ratio.The consolidated stress ratio(or stress level) has little effect on the residual volume deformation. The dynamic residual shear deformation increases with the increase of confining pressure and dynamic stress ratio,and it is greatly influenced by the consolidated stress ratio and increases with the increase of the consolidated stress ratio.A modified formula based on Shen Zhu-jiang's model was proposed to depict the effect of various consolidated stress ratios on the residual shear deformation.The influencing factors for the residual deformation were discussed.The effect of content of particles smaller than 5 mm on the dynamic residual volume deformation was analyzed.
引文
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[12]饶锡保,何晓民,刘鸣.粗粒含量对砾质土工程性质影响的研究[J].长江科学院院报,1999,16(1):21-25(RAO Xi-bao,HEXiao-min,LIU Ming.Influence of coarse-grained content on engineering properties of gravelly soil[J].Journal of Yangtze River ScientificResearch Institute,1999,16(1):21-25.(in Chinese))
[2]陈存礼,何军芳,胡再强,等.动荷作用下饱和尾矿砂的孔压和残余应变演化特性[J].岩石力学与工程学报,2006,25(增刊2):4034-4039.(CHEN Cun-li,HEN Jun-fang,HU Zai-qiang,et al.Developing characteristics of pore water pressure and residualdeformation of tailing sands under cyclic load[J].Chinese Journal of Rock Mechanics and Engineering,2006,25(Sup2):4034-4039.(inChinese))
[3]阮元成,郭新.饱和尾矿料动力变形特性的试验研究[J].水利学报,2003(4):24-29.(RUAN Yuan-cheng,GUO Xin.Experimental study on dynamic deformation properties of saturated tailings material[J].Journal of Hydraulic Engineering,2003(4):24-29.(in Chinese))
[4]孔宪京,韩国成.粗粒料动应力-应变关系试验研究[R].大连:大连理工大学,1994.
[5]贾革续,孔宪京.粗粒土动残余变形特性的试验研究[J].岩土工程学报,2004,26(1):26-30.(JIA Ge-xu,KONG Xian-jing.Study on residual deformation characteristics of coarse-grained soils[J].Chinese Journal of Geotechnical Engineering,2004,26(1):26-30.(in Chinese))
[6]沈珠江,徐刚.堆石料的动力变形特性[J].水利水运科学研究,1996,6(2):143-150.(SHEN Zhu-jiang,XU Gang.Deformationbehavior of rock material under cyclic loading[J].Hydro-Science and Engineering,1996,6(2):143-150.(in Chinese))
[7]迟世春,林皋,孔宪京.堆石料残余体应变对计算面板堆石坝永久变形的影响[J].水力发电学报,1998,60(1):59-67.(CHIShi-chun,LIN Gao,KONG Xian-jing.Influence of residual volumetric strain of rockfill material on calculated permanent deformation ofconcrete faced rockfill dams[J].Journal of Hydroelectric Engineering,1998,60(1):59-67.(in Chinese))
[8]阮元成,陈宁,常亚屏.察汗乌苏水电站坝体料残余变形特性试验研究[J].水利水电技术,2004,35(10):75-77.(RUANYuan-cheng,CHEN Ning,CHANG Ya-ping.Experimental study on the residual deformation properties of fill materials for the concrete-faced dam of Chahanwusu Hydropower Station[J].Water Resources and Hydropower Engineering,2004,35(10):75-77.(in Chinese))
[9]郭兴文,王德信,燕立群,等.水布垭混凝土面板堆石坝地震永久变形分析[J].河海大学学报:自然科学版,2001,29(6):56-60.(GUO Xing-wen,WANG De-xin,YAN Li-qun,et al.Analysis of earthquake induced permanent deformation for high concrete facerockfill dams[J].Journal of Hohai University:Nature Science,2001,29(6):56-60.(in Chinese))
[10]邹德高,孟凡伟,孔宪京,等.堆石料残余变形特性研究[J].岩土工程学报,2008,30(6):808-812.(ZOU De-gao,MENG Fan-wei,KONG Xian-jing,et al.Residual deformation behavior of rock-fill[J].Chinese Journal of Geotechnical Engineering 2008,30(6):808-812.(in Chinese))
[11]郦能惠,朱铁,米占宽.小浪底坝过渡料的强度与变形特性及缩尺效应[J].水电能源科学,2001,19(2):39-42.(LI Neng-hui,ZHUTie,MI Zhan-kuan.Strength and deformation properties of transition zone material of Xiaolangdi Dam and scale effect[J].International Journal Hydroelectric Energy,2001,19(2):39-42.(in Chinese))
[12]饶锡保,何晓民,刘鸣.粗粒含量对砾质土工程性质影响的研究[J].长江科学院院报,1999,16(1):21-25(RAO Xi-bao,HEXiao-min,LIU Ming.Influence of coarse-grained content on engineering properties of gravelly soil[J].Journal of Yangtze River ScientificResearch Institute,1999,16(1):21-25.(in Chinese))
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