Study on new geotechnical evaluation of strength index for small buildings

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Other Title
  • 小規模建築物における地盤の強度指標の新たな評価手法に関する研究
  • - Hammer Drill Sounding test which complements Screw Weight Sounding test -
  • －スクリューウエイト貫入試験を補完するハンマードリルサウンディング試験－

Abstract

<p>In soil investigation of small buildings, Screw Weight Sounding test (SWS) has spread. There are each feature and subject in soil investigations. Authors focused on three subjects of SWS test in a soft residential land. They are the checks of self-settlement layers quality, load bearing layer of a pile, and potentiality of liquefaction. To solve these subjects, for the purpose of complementing SWS test by additional information, authors proposed the Hammer Drill Sounding (HDS) test. The index obtained by HDS test approximates satisfactorily with N value of Standard Penetration Test, and N value converted from SWS test. And it is the feature that this examination does not almost have self-settlements. In addition, hard layers were investigated as compared with SWS test. Therefore, the index was estimated by the same measure from soft layers to hard layers. Moreover, by repeated vibration, the potentiality of liquefaction was checked. About the above contents, authors report the verification result of 33 examination sites. </p>

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