CONSIDERATION ON MECHANISM OF DEFORMATION DUE TO SOIL EXCAVATION IN SOFT CLAY

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  • 湖成堆積粘性土地盤上の護岸改修工事に伴う変状の機構と対策
  • コセイタイセキ ネンセイドジバン ジョウ ノ ゴガン カイシュウ コウジ ニ トモナウ ヘンジョウ ノ キコウ ト タイサク

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Abstract

The deformations were observed over wide range when the soil excavation works were conducted in the soft clay. To make clear a mechanism of this deformation and to investigate a countermeasure work, the creep tests and deformation analysis by the FEM were carried out. From these tests and analysis following results could be drawn. A creep deformation of the clay takes large part and creep strength is 60 or 70% of the peak strength from the triaxial test. The CCP method was adopted as the countermeasure work. It is clear from the FEM analysis considering the creep characteristics that a bigger rigidity of the CCP is necessary to stop the deformation.

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