IDENTIFIKASI PENYEBAB DAN UPAYA PENANGANAN STRUKTURAL BENCANA LONGSOR Studi Kasus Longsor di Dusun Belakang Soya Kelurahan Karang Panjang Kota Ambon

• Main Authors: , Iwan, , Teuku Faisal Fathani, ST., MT., Ph.D.
• 格式: Theses and Dissertations NonPeerReviewed
• 出版: [Yogyakarta] : Universitas Gadjah Mada 2013
• 主題: ETD
• 在線閱讀: https://repository.ugm.ac.id/120717/; http://etd.ugm.ac.id/index.php?mod=penelitian_detail&sub=PenelitianDetail&act=view&typ=html&buku_id=60755

Landslide that occurs in Sub-village of Belakang Soya Village of Karang Panjang City of Ambon has broken down school fence, soil reinforcement embankment and also buried 2 units of civil residence which caused 12 casualties due to the collapse of their own resident. Based on this occurrence, it is necessary to conduct a study by modelling the slope before the occurrence to identify the main cause of the landslide event. Conducting the engineering study based on data that observed from the field, with the secondary data that consist of rainfall data, earthquake occurrence record, and geological data, and as premier data was gathered by topographic survey, drilling, laboratory test and also geo-electric survey. With those data, numerical simulation modelling was carried out using Plaxis software. Model-1 is the slope condition before the occurence, Model-2 is the slope condition after landslided occurrence, Model-3 is the slope condition after the implementation gabion as a countermeasure and Model-4 is the alternative condition as recommendation for slope stability countermeasure. From the simulation result can be concluded that ground water level was highly induce the slope safety factor, the increment of ground water level will decrease the slope safety factor in Model-1, Model-2, Model-3 and also Model-4. However, there is significant difference on safety factor value when the ground water level is -3 meters below the ground surface, on Model-1 and Model-2 the safety factors are below 1.2, but differently on Model-3 and Model-4 are still safe in range which the value are more than 1.3. On Model-3 the safety factor value is 1.306 induce by the gabion implementation, while on Model-4 after decreasing the slope inclination, it shows that the safety factor value is increase to 1.341, means the safety factor value are higher than on Model-3 by 0.04. On the simulation that including the earthquake load factor, value of 0.077 are applied to the Model-1 and 0.28g to the Model-2, Model-3 dan Model-4. On Model-1 using the combination of MAT-3 and eartquake causes extremely critical condition with the safety factor that only reach 1.013 which are smaller than the safety factor of -3 meter ground water level induced landslide. On Model-2 and Model-3 the safety factor only reach 1.053 and 1.056 respectively while on Model-4 the safety factor value slightly increasing to 1.06. Thus, the safest condition is Model-4.