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应力路径对砂土变形特性的影响(曹培)

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应力路径砂土变形特性的影响

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1Z$KFxet*y$U7J0【作者】曹培 【导师】蔡正银
S#}0N-} nq;N0【作者基本信息】南京水利科学研究院,岩土工程,2006年,硕士

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b#B5A6~ ui!R0【中文摘要】 砂土的变形特性不仅依赖于其相对密度也依赖于所处的固结压力。同一固结压力下,密砂剪胀,松砂剪缩;同一密度的砂在低固结压力下可能剪胀,而在高固结压力下则可能剪缩。而对于相同密度和固结压力的砂样,在不同的应力路径下表现出的应力—应变关系、强度、剪胀特性等也都有很大区别。但是目前使用的大多数砂土本构模型多是建立在常规三轴试验的基础上,忽略了砂土的这种状态依赖性及应力路径对模型参数的影响,将不同密度的同一种砂看作不同的材料,采用不同的材料参数来计算。 为了研究应力路径对砂土变形特性的影响,用标准砂制备了三组不同密度的试样,利用CKC多功能三轴仪分别对每组试样在两种不同围压下等向固结,然后按六种应力路径进行了三轴固结排水试验。在研究应力路径影响的同时,也对初始状态包括密度和初始固结应力的影响进行了一些研究。 通过对不同应力路径试验结果的分析和比较,发现应力路径和初始状态对砂土的应力一应变关系、强度、剪胀特性等都有很大影响:对于初始状态相同的砂样,在三轴拉伸试验中表现的剪胀性比在三轴压缩试验中的要小得多;对于初始应力状态相同的砂样,砂土的强度和剪胀性随试样密度的增大而增大;对于同一初始密度的土体,其...更多强度随初始有效正应力的增加而增加,而且压缩性也随之增大,试样最终的体胀值随之减小。根据试验结果,确定了标准砂的临界状态线及临界状态参数。 最后详细介绍了砂土的状态相关本构模型,并以试验结果为依据确定了模型参数,然后利用Fortran程序对试验过程进行数值模拟,并与试验结果进行对比分析。结果表明,该模型能较好的模拟砂土在不同应力路径下三轴排水试验的应力—应变关系和剪胀等变形特性,能够反映砂土的变化规律。  还原

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C-|xrcPpc7F m0【英文摘要】 The behaviors of sand depend not only on its relative density but also on the consolidation pressure. It is shown that, under the same consolidation pressure, sand in a dense state will exhibit dilative response, and it will exhibit contractive response when it is in a loose state. However, sand with the same density will show volume expansion subjected to a low consolidation pressure and it maybe show contractive response under a high consolidation pressure. With regard to the sand samples with the same initial state, their stress-strain relationship, strength and dilatancy are different under different stress paths. Unfortunately, most of the existing constitutive models are based on the routine triaxial tests and do not consider the effect of states and stress paths of sand. One has to use different parameters for sand with different densities.In order to study the effect of stress paths on the deformation behavior of sand, three sand samples with different densities were prepared b...更多y use of standard sand, and then were isotropically consolidated under two kinds of pressures by use of the CKC Triaxial System. Six stress paths tests were conducted on these samples under drained conditions. The effect of the initial states (the density and consolidation pressure) as well as that of stress paths was studied.By analyzing and comparing all the test results, it is found that the stress path can have great effect on the stress-strain relationship, the strength and the dilatancy of sand. Sand with the same initial states shows more contractive response in triaxial extension tests than in triaxial compression tests. Both the strength and dilatancy of sand increase with the density under the same initial effective mean normal stress. In the same way, the strength and compressibility of sand with the same density increase with the initial effective mean normal stress and the ultimate value of volume expansion decrease correspondingly. Then, the critical state lines are provided based on the test results of different stress paths.Finally, the state-dependent dilatancy constitutive model for sand was introduced in detail. After determining all the model parameters according to the test results, numerical calculation of the whole test procedure was studied by applying FORTRAN programs. The model simulations are in agreement with the test results under different stress paths, in terms of both the shear stress-strain response and volumetric characteristics, and the present model can reflect the deformation behaviors of sand.  还原水利论文RHF/LbY*E ZyB

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【中文关键词】 砂土; 应力路径; 三轴试验; 剪胀; 本构模型; 状态相关水利论文`,F$ZP#T/?6w{
【英文关键词】 sand; stress path; triaxial test; dilatancy; constitutive model; state-dependent
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TAG: 特性 应力 砂土 路径
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