Andius, Dasa Putra and Mamoru, Kikumoto (2019) DEFORMATION ON EMBANKMENTS DUE TO SLAKING PHENOMENON AND ITS COUNTERMEASURE. The Geomate International Society, Tokyo, Japan.

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Abstract

Geotechnical issues have increased in the last two decades since sedimentary rocks material such as mudstone or shale has been widely used as embankment material. They, however, tend to be weathered once they are immersed in the water. This phenomenon is a kind of weathering processes known as slaking and may cause a reduction of stiffness and peak strength. This paper, in order to evaluate the slaking induced deformation, a number of one-dimensional compression slaking tests and scanning electron microscopy (SEM) tests to observe the physical morphology of mudstone were performed. These data confirm that slaking in crushed mudstone is accompanied by a variation in the particle size distribution during wetting and drying cycles, and a variation in grading results in an irreversible change in mechanical characteristics, such as the reference packing density. Since the particle size distribution was transformed under confined stress constant occurs without a change in the maximum particle size, it can be described by existing indexes of grading such as breakage parameter Br. Furthermore, to eliminate the deformation behavior of sedimentary rocks, changing the particle size distribution in the beginning by applying loading/unloading history before slaking cycle has exhibited the significant result. The compressibility during wetting and drying cycle decreases to 50% of conventional compression by applying this countermeasure method. In earth construction works, the process of roller compaction is necessary in order to encourage the particle crushing. Proper compaction can control the occurrence of slaking under wetting and drying cycle so that volumetric compression does not occur easily. Keywords: mudstone, slaking, particle size distribution, one-dimensional compression, deformation

Item Type:	Other
Subjects:	T Technology > TA Engineering (General). Civil engineering (General)
Divisions:	Fakultas Teknik (FT) > Prodi Teknik Sipil
Depositing User:	Dr Andius Dasa Putra
Date Deposited:	14 Dec 2022 07:25
Last Modified:	14 Dec 2022 07:25
URI:	http://repository.lppm.unila.ac.id/id/eprint/47205

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