ANALISIS STABILITAS LERENG DAN UPAYA PENCEGAHAN KELONGSORAN DI DESA WIROTAMAN KABUPATEN MALANG JAWA TIMUR

Abstract

ABSTRAK

Kemajuan dalam bidang komunikasi di tanah air terlihat dengan semakin banyaknya pembangunan tower telekomunikasi sampai ke pelosok-pelosok. Namun pembangunan ini juga perlu diwaspadai pada daerah-daerah rawan longsor. Perlu dilakukan kajian secara menyeluruh mengenai kondisi geologis wilayah setempat agar pembangunan tower tidak mendatangkan bencana di kemudian hari. Seperti halnya di Desa Wirotaman, Malang yang akan dibangun tower telekomunikasi. Kontur daerah berbukit dan banyak sumber/ resapan air menjadikan Desa Wirotaman rawan longsor bila intensitas hujan tinggi. Pemukiman penduduk berada di tebing sehingga kerap menjadi korban longsor. Tentu saja rencana pembangunan tower telekomunikasi meresahkan penduduk setempat, karena tower tersebut akan di bangun di atas lereng yang cukup curam. Oleh sebab itu penelitian ini dilakukan untuk menganalisis upaya pencegahan kelongsoran. Studi analisis dilakukan dalam tiga tahap. Tahap pertama melakukan investigasi mengenai kondisi lereng sekaligus penyelidikan tanah untuk mendapatkan data tanah. Selanjutnya tahap kedua analisis terhadap data tanah dan dilanjutkan dengan rencana penanggulangan yang akan dilakukan yaitu merencanakan dinding penahan tanah, terasering, serta rencana galian timbunan. Tahap ketiga adalah melakukan analisis stabilitas untuk dinding penahan tanah terhadap guling, geser dan daya dukung. Dimensi retaining wall yang diperoleh yaitu tinggi 2,8m dan lebar 1,25m, dimensi retaining stairs yaitu tinggi 1,8m dan lebar 1,45m.

Kata kunci: kelongsoran, stabilitas lereng, retaining wall, retaining stairs, terasering

ABSTRACT

Progress in the sector of communication in this country is seen by the increasing number of telecommunications tower construction to remote areas. But this development also needs to be wary of landslide-prone areas. A thorough study needs to be carried out on the geological conditions of the local area so that tower construction does not bring disaster in the future. As is the case in Wirotaman Village, Malang which will build a telecommunications tower. The contour of the hilly area and many water catchments area make the village of Wirotaman prone to landslides when the intensity of rain is high. Settlements are on the cliffs so that they are often victims of landslides. Of course the telecommunications tower construction plan is disturbing the local population, because the tower will be built on a fairly steep slope. Therefore this research was conducted to analyze efforts to prevent landslides. The analytical study was carried out in three stages. The first stage is to investigate the condition of the slopes as well as soil investigations to get soil data. Then the second step is analyzing the soil data and followed by a countermeasure plan that will be carried out, namely planning the retaining wall, making terraces, as well as excavation and embankment plans. The third stage is to conduct a stability analysis for the retaining wall of the rolling, sliding and carrying capacity. Retaining wall dimensions obtained were 2.8m high and 1.25m wide, retaining stairs dimensions were 1.8m high and 1.45m wide.

Keyword: landslide, slope stability, retaining wall, retaining stairs, terracing