Munirwansyah Munirwansyah
Profesor Jurusan Teknik Sipil, Fakultas Teknik, Universitas Syiah Kuala Jl. Tgk. Syeh Abdul Rauf No. 7, Darussalam Banda Aceh 23111

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Stabilization On Expansive Soil For Road-Subgrade For Geotechnic Disaster Approach Munirwansyah, Munirwansyah; Munirwan, Reza Pahlevi
International Journal of Disaster Management Vol 1, No 1 (2017): International Journal of Disaster Management
Publisher : TDMRC Syiah Kuala University

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Abstract

This research was conducted for Blang Dalam expansive clay is located in Pidie Jaya-Aceh, Sumatra-Indonesia, which is one of the embankment material used as road subgrade. Road construction use expansive clay soil for subgrade experiencing many damages. The damage of road construction is caused by low bearing capacity when water levels change, high soil plasticity results swelling experience and shrinkage during the rainy and dry season respectively. One method of expansive clay stabilization effort to increase the carrying capacity of the soil is a mixture of Lime Ca (OH)2. Lime mix percentage variation are; 3%, 6%, 9% and 12% of the dry weight of soil. The purpose of this research is to determine the effect of lime a stabilizing agent to the improvement of the physical and mechanical properties of expansive soil. The result of untreated soil for free swelling is 1.141 % and swelling pressure of 23.18 kPa. For treated soil-lime mixture of 3%, 6%, 9% and 12%, the free swelling value are 0.64 %, 0.47 %, 0.40 % and 0.23 % respectively. Moreover, swelling pressure values for lime variation of 3%, 6%, 9% and 12% are 15.44 kPa, 13.25 kPa, 10.51 kPa, and 9.79 kPa respectively. 12% of soil-lime results shows the most effective results of free swelling which decrease for 1.14% of untreated soil to 0.23% and swelling pressure value of 23.18 kPa for untreated soil decline to  9.79 kPa.
KAJIAN POTENSIAL LIKUIFAKSI AKIBAT GEMPA BERDASARKAN DATA SPT-N DI WILAYAH PROVINSI ACEH Munirwansyah, Munirwansyah; Yunita, Halida; Munirwan, Reza P.
Simposium II UNIID 2017 Vol 2 (2017)
Publisher : Simposium II UNIID 2017

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Abstract

Provinsi Aceh merupakan wilayah yang rawan gempa. Gempa Aceh 26 Desember 2004 dan 7 Desember 2016 telah mengakibatkan terjadinya likuifaksi di beberapa tempat. Likuifaksi telah banyak menjadi penyebab dari kerusakan bangunan dan sarana infrastruktur. Sehingga perlu dikaji potensi likuifaksi di daerah pesisir yang banyak terdapat pemukiman penduduk, bangunan bertingkat dan infrastuktur. Kajian potensi likuifaksi menggunakan data N-SPT, dilakukan dengan menggunakan MetodeKishida (1969), Metode Whitman (1971), serta Metode Valera dan Donovan (1977). Magnitude gempa yang diterapkan adalah 6 SR, 8 SR dan 9 SR. Metode Kishida (1969) memberikan hasil bahwa untuk magnitude gempa 6 SR, 8 SR dan 9 SR tidak berpotensi likuifaksi pada lapisan 3m – 21m. (1971) pada magnitude gempa 6 SR tidak mengalami likuifaksi pada tiap lapisan tanah. Sedangkan Metode Valera dan Donovan (1977) semua lapisan tanah mengalami likuifaksi pada setiap magnitude gempa kecuali pada kedalaman 3m. Gabungan dari ketiga metode di atas memberikan hasil bahwa seluruh lapisan berpotensi likuifaksi kecuali pada lapisan 3 m dengan magnitude gempa 6 SR Dengan demikian pembangunan gedung dan infrastruktur di daerah Pesisir Utara Aceh Provinsi Aceh perlu didahului dengan usaha perbaikan tanah untuk mengantisipasi fenomena likuifaksi.
ANALISIS HKRITIS TERHADAP DAYA DUKUNG TANAH DASAR D. Nasution, Lutfi; Munirwansyah, Munirwansyah; Saleh, Sofyan M.
Jurnal Arsip Rekayasa Sipil dan Perencanaan (Journal of Archive in Civil Engineering and Planning) Vol 1, No 2 (2018): Jurnal Arsip Rekayasa Sipil dan Perencanaan
Publisher : Prodi Magister Teknik Sipil Unsyiah

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (392.914 KB) | DOI: 10.24815/jarsp.v1i2.10940

Abstract

The addition of the existing heap on the ground interface will affect the ability of subgrade to accept the burden of the embankment and other charges on it. The inability of subgrade in accepting the load will result in a decrease in the vertical deformation and collapse. The analysis was conducted on the National Roads Banda Aceh-Medan KM. 83 + 135 of the Seulawah. The purpose of this study is to analyze whether the brunt of the height of the pile (H Critical) have exceeded the carrying capacity of the subgrade. The analysis was performed by using Plaxis software. The implementation method used in the analysis based on the modeling of the pile height variations by reducing the height of the pile with a certain interval gradually until a critical height (H Critical) heap that causes the achievement of maximum decrease of 2.5 cm. The modeling result demonstrates that when the consolidation of the soil embankment on condition of Hheap soil = 6 m, Hheap soil= 5.4 m, Hheap soil = 4.8 m could able to reduce the height of the soil embankment by 10%, 20%, and 30%, and considered in an unsafe condition. While when the soil embankment consolidation reduce by 40% (H heap soil = 3.6 m) showing in a safe condition. This result shows that the forces acting on the pile-soil could not hold the load so that the interface is about to collapse.
ANALISIS STABILITAS LERENG MENGGUNAKAN SOFTWARE PLAXIS 8.6 DENGAN DINDING PENAHAN TANAH (RETAINING WALL) (STUDI KASUS RUAS JALAN NASIONAL BANDA ACEH-MEDAN STA 83+135 GUNUNG SEULAWAH) Wihardi, Wihardi; Munirwansyah, Munirwansyah; Saleh, Sofyan M.
Jurnal Arsip Rekayasa Sipil dan Perencanaan (Journal of Archive in Civil Engineering and Planning) Vol 1, No 3 (2018): Jurnal Arsip Rekayasa Sipil dan Perencanaan
Publisher : Prodi Magister Teknik Sipil Unsyiah

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (312.141 KB) | DOI: 10.24815/jarsp.v1i3.11768

Abstract

Road infrastructure is very important and is a key enabler for the economy. If the road infrastructure was damaged or had various problems such as sliding, the movement of goods and passengers will be hampered and delayed to the acceleration of development in the local area. The landslide and movement of groundwater is a problem that often occurs repeatedly on some streets. Therefore, it is necessary to study the strengthening of the slopes at the bottom of the road construction with retaining wall. This study aims to analyze slope stability by getting numbers Safety Factor (FK). The analysis is used to analyze the stability of slopesusing the finite element method with the help of software Plaids, The scope of this review includes the calculation of slope stability at the national road from Banda Aceh - Medan Sta. 83 + 185 Mount Selawah. The results of slope stability analysis on the existing condition by using Plaxis software at the point of a review is not safe (FK <1.25). Thus, it is done handling the retaining wall, installation of anchors. Based on the analysis of slope stability after being given the strengthening of the slopes with a retaining wall and the installation of anchors using Plaxis software under the influence of traffic load in an unsafe condition (FK <1.25). Then additional handling is done by changing the angle of the slope so that the value of the safety factor (FK)> 1.25.
PENGARUH KAPUR SEBAGAI STABILIZING AGENT TERHADAP INDEKS PLASTISITAS DAN KUAT GESER LEMPUNG EKSPANSIF MEUNASAH RAYEUK Syamdiofa, Teuku Julis; Munirwansyah, Munirwansyah; Anggraini, Renni
Jurnal Arsip Rekayasa Sipil dan Perencanaan (Journal of Archive in Civil Engineering and Planning) Vol 1, No 4 (2018): Jurnal Arsip Rekayasa Sipil dan Perencanaan
Publisher : Prodi Magister Teknik Sipil Unsyiah

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (454.339 KB) | DOI: 10.24815/jarsp.v1i4.12460

Abstract

Clay soil from Desa Meunasah Rayeuk quarry in Kaway XVI,  West Aceh Regency is a land material frequently used for construction of road infrastructure. In this quarry, there are three types of soil based on the color, yellow, red, and gray. The three types of soil have expansive characteristics, so they are not suitable for subgrade.  This unoptimal characteristic can be improved through soil stabilization. One of them by utilizing the reaction of catinonization between lime Ca(OH)2 with the clay soil. Therefore, a research needs to be conducted to find out the characteristics of physical and mechanical properties of the original soil and the effect of cationization of the soil and lime mixture on the soil plasticity index and soil shear strength parameters. Testing is done through mineralogical test and ASTM standard tests that include physical properties, standard compaction, and direct shear strength test. Variations of lime addition are 0%, 3%, 6%, 9%, and 12% of the soil dry weight. The test results show that the addition of lime can reduce the soil plasticity index and increase the shear strength of the soil on some level. At mixing up to 12% lime, the soil plasticity index dropped to 12.93% in yellow clay, 11.12% in red clay, and 16,76% in gray clay. The plasticity index after the addition of 12% lime has not met the minimum plasticity index requirement, ie 11%. The maximum shear strength for yellow clay is obtained at 3% lime, and 6% lime for red and gray clays.
Faktor Keamanan Stabilitas Lereng pada Kondisi Eksisting dan Setelah Diperkuat Dinding Penahan Tanah Tipe Counterfort dengan Program Plaxis Ramadhan, Rizki; Munirwansyah, Munirwansyah; Sungkar, Munira
Reka Buana : Jurnal Ilmiah Teknik Sipil dan Teknik Kimia Vol 5, No 1 (2020): EDISI MARET 2020
Publisher : Universitas Tribhuwana Tunggadewi Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1328.292 KB) | DOI: 10.33366/rekabuana.v5i1.1485

Abstract

The Aceh Tengah / Gayo Lues-Blangkejeren road segment (N.022) Km 438 + 775 is one of the Central Cross National Roads in the Province of Aceh, which often experiences landslides due to being in hilly areas. Landslides that occur in these locations are caused by scouring of road runoff, lack of optimal drainage and the absence of outlets for drainage and soil layers under asphalt pavement consisting of loose material. Therefore, a slope reinforcement study with Counterfort type retaining wall is needed. This study aims to analyze slope stability by obtaining safety factor numbers and identifying slope failure patterns. Analysis was carried out to obtain safety factors and slope failure patterns by using 2D Plaxis and slice methods. The calculation of safety factors for Counterfort type retaining walls is done manually. The input soil parameters used are dry volume weight (gd), wet volume weight (gw), permeability (k), modulus young (Eref), paisson's ratio (?), shear angle (f), cohesion (c) . The results of slope stability analysis on the existing conditions using the Plaxis program and the slice method with radius (r) 65.06 meters found that safety factors were 1.038 and 1.079 with unsafe slope conditions (FK <1.25). The results of the analysis after reinforced counterfort and minipile type retaining wall with a length of 12 meters found 1,268 safety factor numbers with unsafe slope conditions (FK <1,5). Thus, additional reinforcement is needed by using anchor on the counterfort. The results of slope stability analysis after reinforced counterfort, minipile and anchor type retaining walls with a length of 20 meters and a slope of 30 ° were obtained with a safety factor number of 1.513 with safe slope conditions (SF> 1.5).ABSTRAKRuas jalan batas Aceh Tengah/Gayo Lues-Blangkejeren (N.022) Km 438+775 merupakan salah satu ruas jalan Nasional Lintas Tengah Provinsi Aceh, yang sering mengalami terjadi tanah longsor karena berada di daerah perbukitan. Longsoran yang terjadi pada lokasi tersebut disebabkan oleh gerusan air limpasan permukaan jalan, kurang optimalnya drainase dan tidak adanya outlet untuk pembuangan air serta lapisan tanah di bawah perkerasan aspal terdiri dari material lepas. Oleh karena itu, diperlukan kajian perkuatan lereng dengan dinding penahan tanah tipe Counterfort. Kajian ini bertujuan untuk menganalisis stabilitas lereng dengan mendapatkan angka faktor keamanan dan mengidentifikasi pola keruntuhan lereng. Analisis dilakukan untuk mendapatkan faktor keamanan dan pola keruntuhan lereng yaitu dengan menggunakan program Plaxis 2D dan metode irisan. Perhitungan faktor keamanan untuk dinding penahan tanah tipe Counterfort dilakukan secara manual. Adapun parameter  tanah input yang digunakan adalah berat volume kering (gd), berat volume basah (gw), permeabilitas (k), modulus young (Eref), paisson?s rasio (?), sudut geser (f), kohesi (c). Hasil analisis stabilitas lereng pada kondisi eksisting menggunakan program Plaxis dan metode irisan dengan jari-jari (r) 65,06 meter didapatkan akan faktor keamanan sebesar 1,038 dan 1,079 dengan kondisi lereng tidak aman (FK < 1,25). Hasil analisis setelah diperkuat dinding penahan tanah tipe counterfort dan minipile dengan panjang 12 meter didapatkan angka faktor keamanan 1,268 dengan kondisi lereng tidak aman (FK < 1,5). Dengan demikian, maka diperlukan perkuatan tambahan dengan menggunakan angkur pada counterfort. Hasil analisis stabilitas lereng setelah diperkuat dinding penahan tanah tipe counterfort, minipile dan angkur dengan panjang 20 meter serta sudut kemiringan 30° didapatkan angka faktor keamanan 1,513 dengan kondisi lereng aman (SF > 1,5).Kata kunci : longsoran; counterfort; plaxis 2D; faktor keamanan.