CD Tesis

Analisis Stabilitas Lereng Dan Struktur Lapisan Tanah Bawah Permukaan Di Km. 128 Ruas Jalan Pekanbaru – Taluk Kuantan

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At Km. 128 the road section of Pekanbaru – Taluk Kuantan previously the road always settled and tilted toward the river, even though it had been repeatedly repaired. Since similar incident keep happening over and over again, finally the Ministry of Public Works and Public Housing of Riau Province decided to plan the construction of a pile slab and retaining wall on the river side, the construction was carried out in the 2015 fiscal year.
At the time of construction was in progress, due to high rainfall intensity landslide occurred which resulted most of the installed piles shifting so it was necessary to add additional pilling points. For the purpose of making a temporary road in order the traffic flow was not disturbed, the previously stable hillside had to be cut at its feet. As a result of cutting the foot of the hill, the hillside finally collapses.
This research is intended to analyze the structure of the subsurface layer and the depth of the slip surface. The search is also intended to find out whether the handling by construction of the pile slab and retaining walls has been able to improve the stability of the road and slope and try other alternative treatments. The research uses primary and secondary data. Primary data is research data carried out by using the geoelectric resistivity method of the Wenner-Schlumberger configuration. Geoelectric resistivity method of the Wenner-Schlumberger configuration can map the subsurface structure vertically dan horizontally. Primary data collection begins with a review of the research location, determining the direction and number of track to be taken. The equipment used in this study is a resistivity meter Geo Resis-RS 505 equipped with 2 rolls of current cable (500 m/roll, 2 rolls of potential cable (100 m/roll), 2 potential electrodes, 2 curent electrodes (stainless),3 dry batteries, 1 laptop, 2 hammer, 3 walkie talkies and ather tools. Secondary data obtaine from Ministry of Pulic Works and Public Housing of Riau Province. Secondary data includes a map of situation of the landslide location, soil investigation data, drawing of cross section of the road before and after the landslide, shop drawing of pile slab and retaining wall.
Geoelectric measurements carried out in 4 tracks (3 tracks parallel to the road center line and 1 track perpendicular to the road center line). The geoelectrical measurement of track 1 is on a hill and in the direction of road centre line. Geoelectric interpretation result on this track can be read to a depth of 14,0 m. The slip surface is at a depth of + 10,5 – 14 m. The layer above the slip surface with resistivity 1054 – 2873 Ωm is gravelly sandy clay soil, this can be seen from the landslide. Layers with resistivity 497 – 1054 Ωm are assumed to be a sandy clay layers according to the drilling data adjacent to the 1 track location. Track 2 is also on a hill that intersacts with track 1, the interpretation result is the same as track 1. Track 3 is on the side of the road towards the hillside. The results of interpretation of track 3 only detected to a depth of 7 m, this is because the length of the track is only 37,5 m long with an electrode spacing of 2,5 m. The
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slip surface is suspected to be at a depth of + 4 – 7 m. Based on the results of drilling at a location close to track 3, the layer with a resistivity of 2,82 – 45,3 Ωm is gravelly clay, the layer with a resistivity 0,070 – 2,82 Ωm is brownish yellow clay with a thickness of 3,5 m and the layer below is grey stiff clay. Track 4 is next to the shoulder of the road towards the river. On track 4 slip surface are detected at a depth of + 4,5 – 7,5 m. The soil layer with a resistivity of 7,17 – 25,3 Ωm based on the drilling result is a resdish yellow gravelly clay. The soil layer with a resistivity of 1,34 – 7,17 Ωm with a thickness of + 10,5 m is grey silty clay, sof and has high water content. This is very unstable when the layer above it increases its load. This layer has a low permeability so that water accumulates in it which can push this layer down. The underlying layer is silty and sandy clay with grey color and very dense.
Search to determine slope stability was carried out with the Plaxis V.20. program. Plaxis program is a program based on the finite element method. Reasecrh conducted by Wihardi (2018) has proven that the Plaxis program can be used to analyze slope stability and solve geotechnical problems that occur, By using Plaxis program geotechnical modeling in the field can be carried out by entering the required data. The modeling stage with Plaxis software can be done graphically, making it possible to make fairly complex finite element models faster and easier. Slope stability under review is in Km. 128+360 and Km. 128+375. At each location, the slope stability is reviewed in the initial condition (before reinforcement) and after reinforcement as has been done by the Ministry of Public Works and Public Housing of Riau Province and also the slope stability with other alternative treatments, namely the construction of rigid pavement and retaining wall. From the results of calculation with the Plaxis program, for the location of Km. 128+360 the safety factor of the slope before reinforcement is 1,17, after being reinforced as carried out by the Ministry of Public Works and Public Housing of Riau Province the safety factor slightly increases to 1,21 but still below the reqired standard of 1,50. For the location of 128+375 the slope safety factor before reinforcement is 1,18, after being reinforced as carried out by the Ministry of Public Works and Public housing of Riau Province, the safety factor increases to 2,80 while with rigid pavement construction and retaining walls the safety factor increases to 1,53. From the results calculation of slope stability with the Plaxis program, it can be concluded that the handling with the construction of the pile slab dan retaining walls as carried out by the Ministry of Public Works and Public Housing of Riau Province is the most appropriate way to over come.
Key words : Pile slab, retaining wall, Plaxis programme, and slope stability

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Ketersediaan

Informasi Detail

Judul Seri

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No. Panggil

10 12. 221 (0008)

Penerbit

Pekanbaru : Universitas Riau – Pascasarjana – Tesis Teknik Sipil., 2021

Deskripsi Fisik

xvii, 94 hlm.: ill.: 29 cm

Bahasa

Indonesia

ISBN/ISSN

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Klasifikasi

10 12. 221 (0008)

Tipe Isi

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Tipe Media

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Tipe Pembawa

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Edisi

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Subjek

TEKNIK SIPIL

Info Detail Spesifik

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Pernyataan Tanggungjawab

FATAH

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Lampiran Berkas

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