Classification of degradation resistance of muddy rocks using physical and chemical properties

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  • YAMASHITA Koji
    Kiso-Jiban Consultants Co.,Ltd, Kyushu Branch, Technology Management Division
  • YASUFUKU Noriyuki
    Kyushu University, Graduate School of Engineering,Laboratory of Geotechnical Engineering

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Other Title
  • 物理的・化学的特性を活かした宮崎層群泥質岩の劣化抵抗度の分類

Abstract

<p>Muddy rocks such as mudstone and shale are prone to degradation over time, as symbolized by the phenomenon of slaking, which can cause problems in the construction and maintenance of cut slope surfaces. Therefore, it is important to predict and evaluate the progress of deterioration of muddy rocks in advance, and to implement countermeasures to ensure the long-term stability of cut slopes. In this study, in-situ investigation, laboratory tests, and X-ray diffraction analysis were conducted on mudstone, which has been a problem for construction of cut slopes due to its age-related deterioration. The results suggest areas of high potential for degradation in correlations such as “ soil particle density ρs - effective porosity”, “natural water content wn - water absorption Q ”, “degree of weathering wd - natural water content wn ”, “natural water content wn - effective porosity”, “natural water content wn - Q ”, “water absorption Q - uniaxial compression strength qu ”, etc., suggest areas with a high possibility of degradation.</p>

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