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 application of the plant to increase the stability of soil slope on which it would plant vetiver grass is first being used in 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 and 2.206 kPa per kilogram per cubic meter, respectively. From the root weight per volume. Can find the root ratio by volume (Bulk roots ratio), wet and dry, and put into relation to soil shear increased. Equal to 2.574 percent and KPA kPa 14.141 per per percent respectively. Section, the 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 from KPA per. Can then be used to find the value of tight from the root (.) from the observed root (Roots observer) to be used in stability analysis of soil slope at different time intervals?
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