PROGRESSIVE CONSOLIDATION SETTLEMENT OF NATURALLY DEPOSITED CLAYEY SOIL UNDER EMBANKMENT LOADING
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概要
- 論文の詳細を見る
In a naturally deposited soil foundation subject to embankment loading, a delayed settlement can often be observed after the embankment's completion, sometimes also showing acceleration over time. Frequently in such cases the soil exhibits an increase rather than a dissipation of excess pore pressure in some of its parts, a phenomenon which cannot be explained by conventional elasto-plastic consolidation theory. In this paper the possible mechanism for this kind of delayed settlement is investigated numerically using a soil-water coupled elasto-plastic computation under plane strain conditions. It is assumed that the soil section contains a medium dense sand layer and highly structured clay layers. A Super/subloading Yield Surface Cam-clay model is used to describe the elasto-plastic behavior of both the sand and the clay with respect to soil structure, overconsolidation and anisotropy. It is found that the delayed settlement behavior occurs under a certain constant embankment load, and persists over a period of 40 years, with increases in the settlement rate accompanied by both dissipation and a rise in excess pore pressure. The cause of this is the softening that co-occurs with the plastic compression of the soil skeleton. In other words, consolidation settlement can be considered as an example of "progressive consolidation with decay of structure". Some typical characteristics of this delayed settlement behavior are also numerically examined with reference to the height and weight of the embankment, and to soil improvements using sand drains. When the embankment is much lower, the foundation does not undergo delayed consolidation, and when it is higher, the foundation becomes subject to circular slip failure. Soil improvement with sand drains can effectively shorten the length of time up to final settlement.
- 社団法人地盤工学会の論文
- 2005-10-15
著者
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野田 利弘
Department of Civil Engineering, Nagoya University
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中野 正樹
Department of Civil Engineering, Nagoya University
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浅岡 顕
Department Of Civil And Geotechnical Engineering Nagoya University
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Asaoka Akira
Department Of Civil Engineering Nagoya University
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YAMADA Eiji
Department of Pathology, Shiga University of Medical Science
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NAKANO Masaki
Department of Electrical and Electronic Engineering, Nagasaki University
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TASHIRO Mutsumi
Department of Accelerator and Medical Physics, National Institute of Radiological Sciences
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Tashiro Mutsumi
Department Of Civil Engineering Nagoya University
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NODA TOSHIHIRO
Department of Civil Engineering, Nagoya University
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Yamada Eiji
Department Of Pathology Shiga University Of Medical Science School Of Medicine
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Nakano Masaki
Department Of Civil Engineering Nagoya University
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Noda Toshihiro
Department Of Civil Engineering Nagoya University
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Asaoka Akira
Nagoya Univ. Jpn
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Tashiro Mutsumi
Department Of Accelerator And Medical Physics National Institute Of Radiological Sciences
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Yamada Eiji
Department Of Civil Engineering Nagoya University
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Yamada Eiji
Department Of Child Development Kumamoto University School Of Medicine
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