MODELLING SLOPE STABILITY OF WASTE SOIL AT OPEN DUMPING AREA USING PLAXIS 2D

Nowadays slope stability analysis is the important part of the study before the construction that deals with the hills and slopes. But for the dump area, it is not a frequent study to have an assessment for the slope stability. As the dumping area frequently will close after 2 years of operation, the area can be used for the future development for housing area or road construction. The study of Factor of Safety of the waste soil with the graphically modelling will give the further impact for the awareness of the waste soil slope failure. The recent studies have been made about the properties of the waste soil and it shows that waste soil have different soil behaviour than normal soil. Data that have been collected from the recent study can build the slope modelling of the waste soil in order to generate the analysis for slope stability factor of safety. From four different cases that have been studied in this research paper, it shows that the range of the waste soil properties is generally safe within the acceptable slope geometry design from the guideline. The total moment of safety factor for case 1: Differences in Phi is 1.62, case 2: Differences in C is 1.52, case 3: Differences in C and Phi is 1.68 and this model is the highest FOS. The total moment of safety factor for case 4: Critical Value for C and Phi is 1.28 which is the lowest FOS and not passed the JKR Guidelines specification that must be higher than 1.3.