Slope stability assessment and landslide vulnerability mapping of the Institut Teknologi Kalimantan area

Abstract

Slope stability analysis was carried out in the Institut Teknologi Kalimantan which is an area with educational facilities that have a high risk of soil movement. The research area consists of slopes that often reported landslides, especially during the rains time. Evaluation is carried out to the important factors that affect slope stability such as slope geometry consist of 23 zones, soil parameters consist of 7 drilling holes, and past landslide occurrence. Slope stability was evaluated using back analysis based on soil parameters under critical conditions and field investigation and slope geometry using SLOPE/W software to obtain the safety factor (SF) of a certain slope. Landslide vulnerability maps are created based on the risk and potential landslide or landslide occurrence. Based on the results of the stability analysis, there are 6 zones with unstable conditions and a high potential for landslides and 4 zones in critical conditions with moderate landslide potential. The modeling also shows that in the same soil parameter value with a steep slope, the value of the safety factor is getting smaller. This means that the potential for soil movement is greater. Besides, the loading at the top of the slope also causes a reduced safety factor.

Mitigasi Bencana Tanah Longsor Berbasis Masyarakat Melalui Komunitas Siaga Bencana Graha Indah Balikpapan

“…Indonesia berada pada wilayah kerawanan bencana tanah longsor secara geografis(Badan Penanggulangan Bencana, 2012). Longsor selalu dikaitkan dengan daerah perbukitan dan daerah berkembang dimana pembangunan infrastruktur masih marak dilakukan di daerah tersebut (Apriani et al, 2020).Longsoran merupakan gerakan tanah yang dapat menyebabkan kerusakan pada infrastruktur di sekitarnya, memblokir akses jalan, atau merusak lanskap yang ada (Apriani, Mustofa, et al, 2021).Gerakan tanah atau longsoran memiliki gerakan yang sangat cepat dengan area terdampak yang luas meskipun jauh dari sumber longsornya (Hungr et al, 2001).Berdasarkan laporan kinerja Badan Penanggulangan Bencana Daerah Kota Balikpapan Tahun 2016, terdapat beberapa wilayah di kota balikpapan yang memiliki potensi tinggi terhadap kejadian bencana longsor salah satunya adalah kelurahan Graha Indah Jalan Padat Karya (Balikpapan, 2016) . Kejadian longsoran pada daerah tersebut menyebabkan kerusakan pada bangunan dan jalan seperti ditunjukkan pada Gambar 1 dan Gambar 2, kelongsoran menyebabkan terjadinya penurunan tidak seragam pada bagunan yang sangat berbahaya dan menyebabkan kerusakan, mengganggu stabilitas dan merusak estetika serta kenyamanan bangunan (Apriani & Dwicahyani, 2019).…”

Identification of Potential Locations for Soil Investigation based On Geographic Information System (GIS)

“…This study uses soil investigation location data derived from the SPT (Standard Penetration Test) and CPT (Cone Penetration Test) conducted in the Kalimantan Institute of Technology area. The mapping results can serve as a recommendation in campus development and mitigation plans, as they highlight areas with potential soil movement [13] [14]. In addition, the validation of the resulting map will identify the spatial analysis method that achieves the highest level of accuracy.…”

Dam Seepage Control Uses the Blanket Layer Method

“…The seepage must be overcome to prevent damage to the dam structure (Gopal and Kiran, 2014). Assessment of the stability of a slope, both natural slopes and artificial slopes such as dams, is an attempt to analyze how safe these slopes are against avalanche hazards (Apriani, Mustofa and Azhary, 2021). The erosion (piping) can generate a speed that causes erosion because it develops from the centre of the excretion with a relatively significant difference in the height of the pressure (Directorate of Engineering Affairs, 1999).…”