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    I G. N. Wardana


    Drenched rain soil is a cause in reduction of the soil strength in line with
    increasing ground saturation. Reduction of this strength reduces the slope stability
    which can cause sliding during the rainy season. Research was conducted by
    carrying out simulations on slopes using a Stable 2004 Program on different slope
    geometries, number of terraces and soil properties. The effects of drenched rain soil
    were simulated by changing ground water levels. The effects of slope geometries
    including inclination and height of slopes and earthquake loads were considered in
    the analyses. To ease the analyses, the terraces were grouped into 4 which were T1,
    T2, T3, and T4 having 1, 2, 3 and 4 terraces respectively. The slope without terrace
    is referred as T0, the slope inclination changed from 1:1 to 1:2 and 1:3 with
    different type of soils (clay, sand and variation of clay-sand). The analysis results
    showed that the increase in ground water level resulted in the reduction of slope
    stability for the slope of 1:1, 1:2, and 1:3, the safety factors increased with
    increasing number of terraces and the highest was thus in T4. For Sandy slope of
    1:1 with T1 terrace, the increase in safety factor was noticeable, while for T2, T3,
    and T4 types they were almost the same. Sandy slopes of 1:2 and 1:3 with terraces
    changing from T1 to T4 causes the average safety factor increase in slightly. Clay
    slope with earthquake loads of 0.25 g and 0.45 g gave the average reduction in
    safety factor of 43% and 55% respectively. The earthquake loads of 0.25 g and 0.45 g caused reductions on safety factors of sandy slopes by 50% and 70%


    drenched rain slope, geometry, terrace, earthquake

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