Thankfully, droughts, mudslides, soil issues that will occur frequently and with greater severity. Using multiple selection, cheese wawitwokrarom (Bio-engineering) has been implemented to improve the stability of soil slope to achieve sustainability by means of wawitwokrarom cheese (Bio-engineering) is the application of plants in soil slope stability. Which, it is the vetiver grass were the plants were used to improve the stability of clay slopes with this method. Therefore, this research focuses on the study of strengthen the soil with vetiver roots by testing the soil's shear is large (Large direct shear test) the diameter of 140 mm high, 150 mm unit weight pressed 15.5 kPa. In a State of saturation with water time in planting vetiver acrylic tubing approximately 1 year of kasai (355-385 days) It found that the soil's shear is increased from vetiver roots, reinforced. Equals 3.662 kPa Again, both when the value is increased the soil's shear to study together with the vetiver roots from studies in the laboratory found that the relationship between the root weight per volume (Biomass per Unit Volume of Soil of Roots), wet and dry, with shear of the soil increased. Equal to 0.402 kPa per kilogram per cubic meter to 2.206 kPa per kilogram per cubic meter, respectively, and from the root weight per volume that can be priceless. Root ratio by volume (Bulk roots ratio), both wet and dry, and study together with the receiving soil shear increased. Is equal to 2.574 percent 14.141 per kPa kPa per percent respectively. By this research also has the value relationship between the ratio of vetiver roots per side (the Side roots area ratio) to shear the soil increasing 1 clump of vetiver (average from the sample on the top and bottom). Equal to 1.19 percent per kPa, from which these values can then be used to find the value of faith firmly from the root (.) from vetiver root ratio per side (the Side roots area ratio) in the Stadium from the observed root (Roots observer) to bring up the faith tight from the root (.) used in stability analysis of soil slopes from observations at various times, root.
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