Interpretation of the mechanical behavior of embankments having various compaction properties based on the soil skeleton structure
Interpretation of the mechanical behavior of embankments having various compaction properties based on the soil skeleton structure
复制标题
基于土骨架结构解释不同压实特性路堤的力学行为
DOI：
10.1016/j.sandf.2015.09.009
复制
发表时间：
2015
影响因子：
3.7
通讯作者：
M. Nakano
中科院分区：
文献类型：
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作者：
T. Sakai;M. Nakano
阪神Awaji地震灾害后，对堤防的抗震性能进行了评估，并将设计原则从基于规范改为基于性能。然而，《公路路堤土方工程手册》对压实土的压实特性和力学性质考虑不足，本研究的第一个目的是再现三种不同压实特性的路堤材料的力学行为。进行了一系列的三轴压缩试验和固结试验。力学行为采用Systems Cam-Clay模型再现，并从土体骨架结构的角度解释了压实对力学行为的影响。第二个目标是利用土-水耦合有限变形分析程序GEOASIA对路堤的地震稳定性进行评价，该稳定性取决于路堤材料的压实特性。(1)通过三轴试验，最大偏应力随压实度DC的增大而增大。然而，增加的趋势根据材料的不同而不同。(2)基于一维固结试验，压缩曲线近似为竖向有效应力较大的直线。在本研究中，最大干密度越大，可压缩性越小，压缩曲线越低。(3)每种材料的力学行为均由SYCam-Clay模型再现，每种材料使用一组材料常数，并通过不同的结构初始条件和超固结来表示Dc的差异。DC的增加会导致结构的衰变，以及过度固结的积累。在材料A的情况下，结构的衰退和过度固结的损失发生得很快，而在材料C的情况下，结构的衰退轻微，过度固结的损失是中等的。(4)地震反应分析表明，对于不同的材料，即使是相同的DC，路堤的变形也不同。随着直流率的增大，路堤的抗震稳定性得到了提高。结构衰减快、超固结损失快的材料，如A材料，可产生高抗震稳定性的路堤。
After the Hanshin Awaji Earthquake disaster, the seismic resistance of embankments was evaluated, and design principles were changed from specification-based to performance-based. However, compaction properties and the mechanical behavior of compacted soil were not sufficiently considered in the Manual of Highway Earthworks on Embankments.The first objective of the present study is to reproduce the mechanical behavior of three embankment materials having different compaction properties. A series of triaxial compression tests and oedometer tests is carried out. The mechanical behavior is reproduced by the SYS Cam-clay model and the influence of compaction on the mechanical behavior is interpreted based on the soil skeleton structure. The second objective is to evaluate the seismic stability of the embankment, which depends on the compaction properties of the embankment material, using GEOASIA, a soil–water coupled finite deformation analysis code.The primary conclusions are as follows. (1) Through the triaxial tests, the maximum deviator stress increases as the degree of compaction, Dc, increases. However, the trends in the increase differ depending on the material. (2) Based on one-dimensional consolidation tests, the compression curve is approximately a straight line with a large vertical effective stress. In the present study, a greater maximum dry density corresponds to less compressibility and a lower compression curve. (3) The mechanical behavior of each material is reproduced by the SYS Cam-clay model using one set of material constants for each material and representing the differences in Dc by different initial conditions for the structure and overconsolidation. An increase in Dc causes the decay of the structure, as well as the accumulation of overconsolidation. In the case of material A, the decay of the structure and the loss of overconsolidation occur quickly, whereas in the case of material C, the decay of the structure is slight and the loss of overconsolidation is moderate. (4) The seismic response analysis reveals different deformations of the embankment for different materials, even for the same Dc. The seismic stability of the embankments was increased by increasing Dc. Materials, such as material A, that have fast decay of the structure and fast loss of overconsolidation produce embankments with high seismic stability.
通过超级/次加载屈服面 Cam-clay 模拟自然沉积粘土的剪切和一维压缩行为
DOI：
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发表时间：
2005
期刊：
Soils and Foundations(JGS(Japanese Geotechnical Society)) Vol.45, No.1
影响因子：
--
作者：
Nakano;M.;Nakai;K.;Noda;T.;Asaoka;A.
通讯作者：
A.
“接近/处于临界状态的严重超固结粘土的土水耦合行为”土壤和地基。
DOI：
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发表时间：
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