Proposal of new correlation equation between screw weight sounding (SWS) test results and <i>N</i> values / <i>s</i><sub>u</sub> values

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  • FUKAI Akira
    Construction Technology Development Department, Sekisui House
  • OSHIMA Akihiko
    Graduate School, Department of Urban Engineering, Osaka City University
  • YASUDA Kengo
    Tokyo Civil Engineering Branch, Kajima Corporation
  • NAKANO Syougo
    Graduate School, Department of Urban Engineering, Osaka City University
  • HAGIHARA Yudai
    Graduate School, Department of Urban Engineering, Osaka City University
  • MATSUTANI Yuji
    Construction Technology Development Department, Sekisui House

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Other Title
  • スクリューウエイト貫入（SWS）試験結果と<i>N</i> 値，<i>s</i><sub>u</sub>値との新相関式の提案

Abstract

<p>In recent years, fully automatic test methods have been widely used for the Screw Weight Sounding (SWS) test, in which the machine controls load and rotation and records the test results. By the fully automatic test method, it is possible to control the load at the time of scuttling and to investigate at a depth of about 20m, which is difficult by the hand-controled method. Since 2010, we have conducted SWS tests using fully automatic test method throughout Japan and compared results of them with SPT and indoor mechanical test (unconfined compression test and box shear　constant volume test). As a result, it was found that the correlation between the Wsw・Nsw value in SWS test and N value in SPT is low in sandy soil. On the other hand, in cohesive soil, it was found that the correlation is relatively high, and the correlation between the Wsw・Nsw value and value of the undrained shear strength (qu/2 , sub) is high. In addition, according to the test results, it is considered that the formula by Inada, which is often used in practice, equivalent to the lower limit. In this paper, we propose a new correlation fomula showing the relationship between Wsw・Nsw value and N value, su value of cohesive soil, based on the test results conducted at all survey sites using a specific testing machine.</p>

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