不同剪切速率下掺砾料大三轴试验  

Large-scale triaxial tests on behavior of gravelly soil at different shearing rates

作　　者：朱俊高[1,2] 龚选[1,2] 周建方 金伟[4] 殷建华[5] 

机构地区：[1]河海大学岩土力学与堤坝工程教育部重点实验室,江苏南京210098 [2]河海大学岩土工程科学研究所,江苏南京210098 [3]丹阳市水利局,江苏丹阳212300 [4]中国水电顾问集团成都勘测设计研究院,四川成都610072 [5]香港理工大学

出　　处：《河海大学学报（自然科学版）》2014年第1期29-34,共6页Journal of Hohai University(Natural Sciences)

基　　金：高等学校博士学科点专项科研基金(20110094110002);住房和城乡建设部科学技术计划(2012-K3-9);高等学校学科创新引智计划(B13024)

摘　　要：对某心墙堆石坝掺砾心墙料进行三轴固结排水剪切试验,研究剪切速率对掺砾心墙料的应力-应变关系和强度特性影响。结果表明:无论剪切速率高低,掺砾心墙料试样在不同围压条件下应力-应变关系曲线均表现出不同程度的硬化和剪缩现象,随着剪切速率的增加,硬化现象逐步增强,剪缩现象逐渐减小;随着剪切速率的增加,偏应力峰值强度(σ1-σ3)f降低越明显,且强度指标φ减小显著;在试验的剪切速率范围内,割线弹性模量E1随剪切速率的增加而减小,体积模量K1随剪切速率的增加呈先增加、后减小的趋势。The stress-strain behavior and shear strength of gravelly soil at different shearing rates were investigated through a triaxial consolidated-drained shear test on the gravelly soil of a core rockfill dam .The results show that regardless of the level of the shearing rate , the stress-strain behaviors of the gravelly soil exhibited various degrees of hardening and shear shrinkage under different confining pressures .As the shearing rate increased , the hardening gradually strengthened but the shrinkage weakened .The peak deviatoric stress （σ1-σ3 ） f decreased remarkably with the increase of the shearing rate , and the intensity index φdecreased significantly .In the range of testing shearing rates, the secant modulus E1 decreased with the increase of the shearing rate , and the bulk modulus K1 increased initially , and then decreased with the increase of the shearing rate .

关 键 词：掺砾心墙料 剪切速率 土体强度特性 大三轴试验 固结排水剪试验 

分 类 号：TV641.41[水利工程—水利水电工程] TU41[建筑科学—岩土工程]