EVALUATION ON APPLICABILITY OF IN-SITU FREEZING SAMPLING METHOD FOR SANDS CONTAINING FINES

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  • 細粒分を含む砂地盤に対する原位置凍結サンプリングの信頼性の評価
  • サイリュウブン オ フクム スナジバン ニ タイスル ゲンイチ トウケツ サンプリング ノ シンライセイ ノ ヒョウカ

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Abstract

The applicability of the in situ freezing sampling method for sands containing fines is discussed in this paper. Procedures for evaluating in situ frozen sample quality of sands containing fines are proposed based on the fact that the reduction in liquefaction resistance can be uniquely related to the volumetric expansion during freezing for sands containing up to 20% fines. Based on the heat conduction analysis of the ground and frost expansion tests of the soil, an analytical solution, which forms the key of the proposed procedure, is then obtained by coupling the frost expansion strain and confining stress. This paper also presents a case history in which this sample quality evaluating procedure was applied in actual freezing sampling on ground containing fines.

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