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Effects of slaking and degree of compaction on the mechanical properties of mudstones with varying slaking properties

2018; Elsevier BV; Volume: 59; Issue: 1 Linguagem: Inglês

10.1016/j.sandf.2018.09.004

2524-1788

Takayuki Sakai, Masaki Nakano,

Geotechnical and construction materials studies

An earthquake in Suruga Bay off Shizuoka Prefecture in 2009 caused an embankment near the Makinohara Service Area of the Tomei Expressway to fail. One of the causes of this failure was the slaking progression of the Neogene Period mudstone in the lower portion of the embankment. The objective of this study is to understand how the degree of slaking affects the compressive and shearing behaviors of crushed mudstone aggregates. A drying-immersion cycle test is proposed; it illuminates how the number of repeated drying and immersion cycles affects the slaking of fine-grained material. Unconfined compression, triaxial compression, and one-dimensional consolidation tests were carried out on crushed mudstone aggregate specimens created by compaction. Consequently, the unconfined compressive strength and maximum deviator stress in the triaxial compression tests on the crushed mudstone aggregates dropped as the grains became finer due to slaking even if the initial density was the same. The compressibility increased and the consolidation yield stress decreased as the grains became finer particles. The degree to which slaking had progressed affected these characteristics as well.