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INTISARI

Pada tahun 2005-2014 terjadi kenaikan jumlah bencana longsor di Indonesia. Salahsatunya adalah di Jalan Sektor 9 STA 0+900, Kabupaten Muara Enim, Sumatera

Selatan. Longsoran mengakibatkan terganggunya aktifitas perekonomian di

kawasan tersebut. Selain itu lereng yang telah mengalami longsor berpotensi terjadi

longsoran susulan, sehingga perlu dilakukan perancangan penanganan longsor.

Penelitian dimulai dengan survei investigasi lapangan, dilanjutkan dengan

pengujian laboratorium dan penentuan jenis perancangan pengaman konsruksi

lereng. Terdapat 3 jenis perancangan yang digunakan: (1) penataan geometri lereng,

(2) penggunaan dinding penahan tanah jenis cantilever wall, (3) penataan geometri

lereng dikombinasikan dengan drainase horizontal. Hasil perancangan selanjutnya

dianalisis dengan menggunakan softwarePlaxis dan Slope /W untuk mengetahuitingkat kestabilan lereng setelah penanganan.

Pada perancangan penataan geometri dan perancangan cantilever wall, SF

minimum merupakan pada kondisi adanya beban gempa dan muka air tanah tetapi

tidak terdapat beban lalu lintas. Total displacement terbesar merupakan kondisi

adanya muka air tanah, beban gempa dan dengan beban lalu lintas. SF maksimum

merupakan kondisi tidak ada muka air tanah dan tanpa beban gempa. Pada

perancangan penataan geometri dan drainase horizontal, SF minimum dan total

displacement berada pada kondisi terdapat beban gempa. SF maksimum pada

kondisi tidak ada beban gempa. Pada perancangan penataan geometri lereng SF

minimum 0,888, SFmaksimum 1,264, nilai total displacementterbesar 0,122 m,dan estimasi biaya konstruksi sebesar Rp 52.527.128,14.. Pada perancangan dengan

cantilever wall diperoleh SF minimum 1,022, SF maksimum 1,600, total

displacementterbesar 0,123 m, dan estimasi biaya konstruksi Rp 520.327.387,09.

Pada perancangan penataan geometri lereng dan drainase horizontal diperoleh SF

minimum 0,911, SFmaksimum 1,237, total displacement terbesar 0,113 m, dan

estimasi biaya konstruksi Rp 70.933.273,59. Pada penataan geometri lereng nilai

SF minimum dapat ditingkatkan dengan adanya penambahan gebalan rumput dan

drainase horizontal yang dapat mengontrol aliran air permukaan. Dari hasil analisis

stabilitas lereng pada ketiga jenis penanganan tersebut dinyatakan cukup aman

terhadap perancangan penataan geometri lereng, dan aman pada perancangan

cantilever wall.

Kata kunci: stabilitas lereng, penataan geometri, cantilever wall, drainase

horizontal, Plaxis, Slope /W.

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ABSTRACT

Between 2005

2014, there was an increase number of landslides in Indonesia. Oneof them is located in the Sector 9 STA 0 + 900, Muara Enim, South Sumatra. The

landslide was lead to the disruption of economic activities in that region. In

addition, the slopes that once have undergone landslides would highly be potential

to have an aftershock, so it is necessary to mitigate the of landslides towards this

probability.

The study began with a field survey, followed by laboratory testing and the

determination of safety slope construction design. There are three designs used: (1)

geometrical slope controlling, (2) the use of Cantilever retaining wall, (3)

geometrical slope controlling which combined with horizontal drainage. The result

of the design will be analyzed with Plaxis and Slope/W software to determine thelevel of slope stability on post-mitigation.

In geometrical slope control and cantilever wall design, minimum Safety Factor

(SF) is a condition with seismic load and water level, but there is no traffic load.

Maximum Safety factor is a condition with no water level and seismic load.

Maximum total displacement is a condition with water level, seismic load, and

traffic load. In geometrical slope control with horizontal drain, minimum safety

factor and total displacement in a condition with seismic load and maximum safety

factor in a condition without seismic load. In slope geometric control produces

minimum SF 0,888 and maximum SF 1,264, maximum total displacement is 0,122

m, and estimated costs constrcuction Rp 52.527.128,14. In cantilever wall designproduces minimum SF 1,022 and maximum SF 1,600, maximum total displacement

0,123 m, and estimated costs construction Rp 520.327.387,09. In slope geometric

control and horizontal drain produces minimum SF0,911, maximum SF1,237,

maximum total displacement 0,113 m, and estimated costs construction Rp

70.933.273,59 . In slope geometric control, minimum SF can be increase with grass

and surface drainage to control surface flow. Based on stability analysis for all

mitigation, can be defined that mitigation was quite safe for slope geometric control

and safe for cantilever wall design. It is recommended to use the cantilever wall

according to the safety factor value, the land use condition, and cost construction.

Keywords: slope stability, geometric control, cantilever wall, horizontal drainage,

Plaxis, Slope/W.