Predictive equation of shear-strength parameters and permeability of grus using by unit weight and grain size

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  • WAKATSUKI Tsuyoshi
    Graduate School of Life and Environmental Sciences, University of Tsukuba
  • SASAKI Yoshinori
    Master's Program in Science and Engineering, University of Tsukuba
  • TANAKA Yukiya
    Department of Geography, Research Institute for Basic Sciences, Kyung Hee University
  • MATSUKURA Yukinori
    Graduate School of Life and Environmental Sciences, University of Tsukuba

Bibliographic Information

Other Title
  • マサ土における単位体積重量と粒度組成を用いたせん断強度定数及び透水係数の推定の試み
  • マサド ニ オケル タンイ タイセキ ジュウリョウ ト リュウド ソセイ オ モチイタ センダン キョウド テイスウ オヨビ トウスイ ケイスウ ノ スイテイ ノ ココロミ

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Description

Based on the results of field measurement of physical and mechanical properties of hillslope materials in granitic mountains, the angle of shearing resistance (φsat, degree), the cohesion (Csat, gf/cm2) and the hydraulic conductivity (K, cm/sec) of grus under saturated water content were deduced by two parameters of unit weight and grain size of soil as following regression equations :<br>φsat=22.2γdCC0.0625+9.5(R2=0.71)<br>Csat=133.6γd-55.7CC2.0-100.0(R2=0.75)<br>log10K=-1.512γdCC2.0-0.211(R2=0.79)<br>where γd is the dry unit weight of soils (gf/cm3) and CCD is the content for coarser grains than D mm. Since the values of CC0.0625 and CC2.0 can be easily measured by sieving method and γd is estimated using simplified dynamic cone penetrometer, these parameters can be estimated using the above equations at many points and depths of the soil layer on steep mountains.

Journal

  • Sabo Gakkaishi

    Sabo Gakkaishi 58 (4), 13-21, 2005

    Japan Society of Erosion Control Engineering

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