Laboratory Study on Shear Strength of Soil using Woven and Non-woven Geotextiles

: In constructing a construction, it is necessary to identify the type of soil as a place for the foundation and the building to rest on it. The carrying capacity of the soil also varies, in sand that has a uniform gradation when it is saturated, the shear strength will decrease. One way that can be done to increase the shear strength of the soil is to provide reinforcement with the addition of geotextiles. The shear strength parameters used in the planning of the bearing capacity of the soil reinforced by geotextiles are the internal friction angle and the interaction coefficient between the geotextile and the sand. The sample of this study used liquefaction potential sand Bangka using woven and non-woven geotextile reinforcement with a relative density variation of 25%, 50%, 75%. For use geotextiles are installed vertically and horizontally. To get the parameter value of shear strength, Direct Shear testing is carried out. Based on the test results, it is found that Bangka sand is uniform sand with values of Cu <6 and Cc <1. The increase in shear strength in the samples reinforced by geotextile vertically is greater than horizontally at a density of 25% and 50%, while at a density of 75% it states otherwise.