Abstract
ABSTRACT In this year, landslide disaster such as embankment slide, bank slide, or buried of soil (trash) often occurs. All of them begin with a simple problem, that is infiltration of rain water (or other) into soil causing the decrease of shear strength, finally passed the limit of landslide safety factor F, so landslide occurs. The research tries to know the behavior of clayey-mud soil with several ratio of clay content and several water content ratio to find out how much clay content and water content (w) may induce soil collapse. This experiment research was conducted in the soil laboratory UNY using clayey-mud soil from Klaten which has been conditioned in several clay content (00/0-400/0) and water content w (20%-30%) and then direct shear tests were applied. The product of this experiment were: cohesion (c), internal soil shear angle, phi ( 25% water content,interlocking (cohesion) would constant. The maximum cohesion (interlocking)(0.09 kg/cm2) reaches at 20% of water content (2) For pure mud soil, increasing of water content until 30% would increase of 25%, the value of <p and F would decrease. The <p value until 7.7° at w=300/0 (at 40% clay content). Keywords: mud. clay, soil, water content, cohesion, landslide.
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