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Analisis Dinamik Fondasi Mesin Generator Sets pada Power House Building Project Lube Oil Blending Plant Isti Radhista Hertiany; Hary Christady Hardiyatmo; Fikri Faris
Jurnal Tekno Global Vol 8, No 1
Publisher : UNIVERSITAS INDO GLOBAL MANDIRI

ABSTRACTGenerator set machine foundations in the Power House Building Project Lube Oil Blending Plant is located on Cilegon Industrial Estate Area (KIEC), Banten. Machine foundation is analyzed in three conditions to check the safety condition against the dynamic load. The first condition is the existing condition where the block foundation is not embedded in the ground. From the results of the analysis of this condition, the natural frequency value is 20,077 Hz. It is very close to frequency of machine foundation, although it is safe from resonance. The vertical and horizontal amplitude is safe because smaller than permission amplitude. In the second condition, the effect of the embedded block foundation is checked, the smaller natural frequency value 13,305 Hz is safe against resonance. The amplitude value obtained is also smaller. In the last condition analyzed the embedded block foundation without using piles to determine the effect of piles during the machine foundation system. Although the results of the analysis obtained a smaller natural frequency value of about 10,628 Hz but seen from its value of vertical and horizontal amplitude, the foundation without pile is not safe. In general, it can be concluded that the existing foundation is safe from dynamic load, but it would be better if the foundation of the block is embedded on the ground. The use of piles can reduce the amplitude value of machine foundation.Keywords : machine foundation, dynamic analysis, generator setsABSTRAKFondasi mesin generator sets pada Power House Building Project Lube Oil Blending Plant berlokasi di Kawasan Industrial Estate Cilegon (KIEC), Banten. Analisis fondasi mesin dilakukan dengan tiga kondisi untuk mengecek keamanan fondasi terhadap beban dinamik. Kondisi pertama adalah kondisi eksisting dimana fondasi blok tidak tertanam dalam tanah. Dari hasil analisis kondisi ini didapatkan nilai frekuensi natural 20,077 Hz. Frekuensi natural tanah ini mendekati nilai frekuensi mesin, walaupun masih saman dari resonansi. Nilai amplitudo vertikal dan amplitudo horizontal aman karena lebih kecil dari nilai amplitudo izin. Pada kondisi kedua dicek pengaruh fondasi blok tertanam dan dihasilkan nilai frekuensi natural yang lebih kecil yakni 13,305 Hz dan aman terhadap resonansi. Nilai amplitudo yang didapat juga lebih kecil. Pada kondisi terakhir dianalisis fondasi blok tertanam tanpa menggunakan pile untuk mengetahui pengaruh pile pada sistem fondasi mesin. Walaupun dari hasil analisis didapat nilai frekuensi natural yang lebih kecil yakni sekitar 10,628 Hz, namun dilihat dari nilai amplitudo vertikal dan amplitudo horizontalnya, fondasi tanpa pile ini tidak aman. Secara umum dapat disimpulkan bahwa fondasi eksistingaman terhadap gaya dinamik, namun akan lebih baik jika fondasi blok tertanam dalam tanah. Penggunaan pile mampu memperkecil nilai amplitudo pada fondasi mesin.Kata kunci : Fondasi mesin, analisis dinamik, generator sets

Optimasi Perancangan Timbunan Sampah Perkotaan Studi Kasus TPA Kabinuang Tolitoli Moh Nasril; Ahmad Rifai; Fikri Faris
Semesta Teknika Vol 23, No 1 (2020): MEI 2020
Publisher : Universitas Muhammadiyah Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18196/st.v23i1.6677

Pertambahan populasi penduduk khususnya daerah pemukiman kota meningkatkan jumlah sampah padat perkotaan. Sistem pengolahan timbunan sampah pada tempat pembuangan akhir (TPA) kurang efisien sehingga melebihi kapasitas. Berbagai cara diperlukan untuk memaksimalkan kapasitas tempat pembuangan. Lokasi penelitian ini terletak di TPA Kabinuang, Kabupaten Tolitoli. Dalam penelitian ini dilakukan pengambilan sampel di lapangan secara Test Pit di kedalaman 1-2 m pada 3 titik pengamatan mewakili sampel sampah lama (SL), sampah berumur sedang (SS) dan sampah baru (SB) juga sampel tanah dasar (TD) dan tanah penutup (TP). Sampel kemudian diuji kadar organik, kadar air, spesific gravity dan uji triaxial. Data laboratorium kemudian dianalisis dan dilakukan pemodelan dengan variasi lapisan timbunan sampah khususnya pada sampah baru dengan penambahan lapisan tanah penutup. Digunakan program Rocscience (finite element) dan Slide (limit equilibrium) 2 dimensi untuk mendapatkan nilai angka aman dan displacement lereng timbunan sampah pada TPA Kabinuang. Hasil analisis 2D stabilitas lereng timbunan sampah memiliki optimasi desain dengan peningkatan kapasitas timbunan setinggi maksimal 10 m dari kondisi awal dan kemiringan lereng 450 tanpa menggunakan lapisan tanah penutup menghasilkan displacement 0,31 m dan angka aman kondisi statis 3,03 dan 1,16 kondisi dinamis. Apabila digunakan lapisan tanah penutup, kestabilan lereng timbunan sampah meningkat, ditunjukkan displacement yang terjadi lebih kecil yaitu 0,18 m dan angka aman 2,61 kondisi statis dan 1,11 kondisi dinamis. The increase in the population, especially urban settlements increases the amount of municipal solid waste. The processing system of waste embankment at the landfill (TPA) is less efficient so that it exceeds capacity. Various ways are needed to maximize landfill capacity. The location of this study is located in the TPA Kabinuang, Tolitoli Regency. In this research, the Test Pit was taken in the field at a depth of 0,5-1 m at 3 observation points representing samples of old waste (SL), medium aged waste (SS) and new waste (SB) as well as subgrade samples (TD) and soil cover (TP). The samples were then tested for organic content, water content, Specific Gravity and Triaxial test. Laboratory data are then analyzed and modeling with variations in layers of landfill, especially in new waste with the addition of overburden. 2-dimensional Rocscience (limit equilibrium) and Slides (equilibrium) programs were used to obtain the safe and displacement value of the landfill slope at the Kabinuang landfill. 2D analysis of slope landfill stability has optimized the design with an increase in embankment capacity as high as a maximum of 10 m from the initial condition and slope of 450 without using soil cover resulting in a displacement of 0,31 m and a safety factor of static conditions 3,03 and 1,16 dynamic conditions. If the soil cover is used, the slofe stability of the landfill increases, indicating that the displacement is smaller, which is 0,18 m and the safety factor is 2,61 static conditions and 1,11 dynamic conditions.

EVALUASI PENURUNAN KONSOLIDASI TANAH DI SEMARANG UTARA BERDASARKAN KORELASI N-SPT DENGAN mv Hendra Masvika; Agus Darmawan Adi; Fikri Faris
Rekayasa Sipil Vol 7, No 1 (2018)
Publisher : Universitas Mercu Buana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22441/jrs.2018.v07.i1.01

Dampak negatif penurunan tanah di Kota Semarang bagian utara telah dirasakan oleh masyarakat selama bertahun-tahun. Penurunan tanah yang dibarengi dengan abrasi pantai, intrusi air laut dan banjir pasang air laut ke permukiman penduduk semakin memperparah kerusakan fisik dan lingkungan. Kondisi tanah penyusun yang didominasi oleh tanah endapan alluvium dengan konsistensi sangat lunak sampai medium dan mudah mampat mendorong proses konsolidasi diprediksi akan terus berlangsung untuk waktu yang sangat lama. Oleh sebab itu, perlu dilakukan kajian geoteknik berkelanjutan untuk mengevaluasi penurunan konsolidasi di Semarang Utara. Tujuan penelitian ini adalah untuk memprediksi besar dan laju penurunan tanah akibat konsolidasi. Adapun parameter konsolidasi untuk setiap kedalaman lapisan tanah yang ditinjau ditentukan dari hasil korelasi antara N-SPT dengan mv. Hasil perhitungan dengan metode 1 D Terzaghi menunjukkan bahwa besar penurunan tanah cukup bervariatif untuk jangka waktu sangat lama, tergantung pada ketebalan lapisan konsolidasi dan beban permukaan. Simulasi numeris menggunakan SIGMA/W diberikan sebagai perbandingan dalam perhitungan ini.

Perbaikan Tanah Dasar Jalan Tol Semarang – Demak Menggunakan Bahan Aditif Dan Perkuatan Kolom Stabilisasi Anindita Dwi Anggraini; Ahmad Rifa’i; Fikri Faris
Rekayasa Sipil Vol 12, No 1 (2018)
Publisher : Department of Civil Engineering, Faculty of Engineering, University of Brawijaya

In Semarang there is often a flood of sea water that swamp the road. This happens because the ground is lower than the water level, load-carrying capacity is deficient. Following up on this, a new road network is needed as a toll road. To accomplish the problem, it is necessary to increase the load-carrying capacity by improve the subgrade on the toll road using additive and strengthen the stabilization column. Additives used in the form of additives made of inorganic materials containing compounds of calciumchloriddihydrat with pH of 8.24 which has ion bonding energy is greater than the metal material on the surface of the soil grains. The general composition consists of carbon elements 72.78%, hydrogen 21.11%, and nitrogen 1.36%. The research was conducted on soil mix, additive material by comparison 1 gram of additive, 1 liter of water and variation of cement content like 4%, 5%, 6%, 7%. To get the optimum mix for soil improvement. Then numerical analysis by using Plaxis Software v.8.6 with variation of soil thickness and column length stabilization. Test results show that the soil is high-plasticity clay. The soil stabilization was eligible for soil compressive strength testing for layers of soil composite cement foundation of 24 kg / cm2. Soil compressive strength testing of soil stabilization is 2,47 kg/cm 2 with 7% cement and addictive. Based on numerical analysis with plaxis v 8.6 software, the deformation value in the model with 5 m thick soil stabilization and 50 m stabilization column length has met the embankment degression limit according to the PU guideline that is 20 mm for the 1st class road. For the value of road stability safety factor, eligible value 1.4.

Geotechnical Investigation and Numerical Analysis of Rockfall in South Coast of Gunung Kidul Regency Odhi Attabik Illiyin; Fikri Faris
Journal of the Civil Engineering Forum Vol. 3 No. 1 (January 2017)
Publisher : Department of Civil and Environmental Engineering, Faculty of Engineering, UGM

On 17th of June 2015, rockfall occurred on the South Coast at Gunung Kidul Regency taking a few casualties. The preliminary investigation results concluded that many cliffs on the South Coast are dangerous, and there is a potential that similar events might happen in the future. Therefore, geotechnical investigation in order to plan mitigation action is necessary. Field investigations, laboratory work, and numerical modeling were employed in this study, focusing on Sadranan beach where the incident happened. Rock slope stability analyses by means two-dimensional finite element in both static and seismic conditions were conducted. The investigation results show that both biological decay and wave erosion influence the rock slope instability. Moreover, the infilling material in rock joint has considerable effect on the stability of the slope. However, the results from numerical simulation suggested that potential failure was originating from the intact rock body instead of the plane of discontinuities. In the seismic condition, the slopes are more vulnerable and further mitigation action should be considered in the future.

A Numerical Analysis of Landslide Movements Considering the Erosion and Deposition along the Flow Path Aminudin Syah; Teuku Faisal Fathani; Fikri Faris
Journal of the Civil Engineering Forum Vol. 5 No. 3 (September 2019)
Publisher : Department of Civil and Environmental Engineering, Faculty of Engineering, UGM

Landslides are one of the most frequent disasters which occur widespread in Indonesia. This disaster often causes damages and fatalities. One of the mitigations efforts to reduce potential loss is by predicting the area affected by landslide movement. This research developed a numerical model of landslide movement by incorporating the erosion and deposition laws along the flow path. This model improves the accuracy of the previous models which assume that landslide volume is constant without any consideration for the erosion and deposition. The governing equation of this newly developed model uses the Eulerian numerical approach based on the finite difference scheme. The erosion-deposition laws applied in this research are from Egashira et al. (2001), McDougall and Hungr (2005), and Blanc (2008). The simulation program applies Python programming language and examines an imaginary slope with ellipsoid-shaped of source area. The simulation result shows that the additional erosion-deposition formula can enlarge the volume and the affected area of landslide movement. It is clarified that the erosion rate is a determinant factor affecting the results of calculation.

Parametric Study of the Effect of Ground Anchor on Deep Excavation Stability Aditya Putra Pratama; Hary Christady Hardyatmo; Fikri Faris
Journal of the Civil Engineering Forum Vol. 6 No. 1 (January 2020)
Publisher : Department of Civil and Environmental Engineering, Faculty of Engineering, UGM

Apartment construction is mostly carried out by including deep excavation works. However, excavation causes land instability; hence, the work needs to be done by a particular handler. In some cases, deep excavation is carried out on soft soil, which has a very high level of soil instability; therefore, a specific handling method such as ground anchor is required as an alternative. This study aims to conduct parametric research on the effect of using anchors on the stability of deep excavation. First, anchors of various slopes were modelled while varying the number of anchors up to four pieces. From the results of the study, the requirements representing the most efficient use of anchors were selected, and then various anchor bond lengths were modelled. Finally, the effect of applying various magnitudes of prestress forces to the anchor was determined. All of the models were examined to determine the influence on the stability of the deep excavation by observing the horizontal displacement and the forces that occur on the secant pile. From the analysis results, it can be concluded that the most effective slope angle is 0°. The displacement and forces occurred in the secant piles on the use of two, three, or four anchors has not a significant difference. The application of a higher prestress force on the anchor would yield better results as long as it is not exceeding 200 kN. However, in the case of an apartment building’s plans in Surabaya, the optimal anchor usage was found to be the use of two anchors with a 45° slope, 4.5 m for the first (A) and second (B) anchor bond lengths, 15 m free length anchor, 2.5 m vertical anchor distance, 1.2 m horizontal anchor distance, and the application of 200 kN prestress force.

Determination of Stability During First Impounding in Jatigede Earth Dam Teuku Faisal Fathani; Anafi Minmahddun; Fikri Faris
Journal of Applied Geology Vol 3, No 2 (2018)
Publisher : Geological Engineering Department Universitas Gadjah Mada

The Jatigede Dam is a multi-purpose rockfill dam located in Sumedang Regency, West Java Province. The construction of the Jatigede Dam started in 2008 and it is the second largest dam in Indonesia after the Jatiluhur Dam. As one of the vital facilities, it is highly necessary to evaluate the stability of the Jatigede Dam to avoid dam collapse. First reservoir filling is one of the factors affecting the dam stability; therefore, this research aims to evaluate the Jatigede Dam stability during impounding. The transient seepage analysis was conducted to evaluate the pore pressure change during impounding. The result of seepage analysis was used to analyze the dam stability using the limit equilibrium method with Rockscience software of Slide2. The results of the seepage analysis shows that the rise of the reservoir water level affects the upstream slope stability. The safety factor of the upstream slope changes during the impounding process. All thesafety factors for the upstream and downstream slopes during impounding still meet theminimum safety factor criteria required.

Hubungan Klasifikasi RMR dan Faktor Keamanan Terhadap Penentuan Geometri Lereng Tambang Terbuka (Studi Kasus: Tambang Terbuka Batubara Desa Kebur, Kecamatan Merapi Barat, Kabupaten Lahat, Provinsi Sumatera Selatan) Rahmad Dwi Prasetyo; Fikri Faris; Ahmad Rifa'i
Jurnal Fondasi Vol 11, No 2 (2022)
Publisher : JURUSAN TEKNIK SIPIL

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36055/fondasi.v11i2.16751

Klasifikasi Rock Mass Rating (RMR) merupakan salah satu klasifikasi yang digunakan dalam klasifikasi massa batuan. Geometri massa batuan di suatu lereng perlu diperhatikan dalam analisis kestabilan lereng. Rekomendasi geometri lereng diperlukan untuk mendapatkan faktor keamanan lereng yang aman dan stabil dalam kondisi statis, dinamis, maupun probabilitas sesuai KEPMEN 1827 K/30/MEM/2018. Penelitian ini dilakukan di lokasi Izin Usaha Pertambangan (IUP) tambang terbuka batubara Desa Kebur, Kecamatan Merapi Barat, Kabupaten Lahat, Provinsi Sumatera Selatan. Prosedur penelitian ini dilakukan dengan pengumpulan data sekunder sebagai data dasar untuk analisis klasifikasi RMR dan nilai faktor keamanan setiap area PIT. Analisis RMR menggunakan klasifikasi Bieniawski tahun 1989, sedangkan nilai faktor keamanan didapatkan dari analisis kestabilan lereng menggunakan metode kesetimbangan batas Spencer dengan bantuan software SLIDE. Hasil analisis yang didapatkan adalah urutan kelas massa batuan berdasarkan klasifikasi RMR dari yang paling baik adalah PIT-4, PIT-2, PIT-1, PIT-5, dan PIT-3. Berdasarkan nilai faktor keamanan, PIT-2 dan PIT-4 tidak memerlukan adanya perubahan geometri lereng, sedangkan PIT-1, PIT-5, dan PIT-3 memerlukan adanya perubahan geometri lereng. Semakin baik kelas massa, batuan, maka nilai faktor keamanan semakin tinggi, sehingga geometri lereng tidak memerlukan perubahan. Rekomendasi geometri lereng yang digunakan adalah lereng asli untuk PIT-2 dan PIT-4, lereng dengan kemiringan geometri 55⁰ untuk PIT-1, dan lereng dengan kemiringan geometri 50⁰ untuk PIT-3 dan PIT-5.

PREDIKSI BIDANG GELINCIR GERAKAN TANAH MENGGUNAKAN METODE ELECTRICAL RESISTIVITY TOMOGRAPHY (ERT) Achmad Sri Fadli; Teuku Faisal Fathani; Fikri Faris
Jurnal Teknik Sipil Vol. 17 No. 1 (2022)
Publisher : Program Studi Teknik Sipil Fakultas Teknik Universitas Atma Jaya Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24002/jts.v17i1.5989

Terjadi longsor di area tebing batu (Rocky Wall) jalan akses fasilitas produksi pipa penyalur uap dan brine Pembangkit Listrik Tenaga Panas bumi (PLTP) milik PT. Pertamina Gothermal Energy (PT.PGE) di Kabupaten Muara Enim, Provinsi Sumatera Selatan, yang menyebabkan terjadinya penurunan produksi (derating) di PLTP akibat rusaknya fasilitas produksi dari sumur produksi klaster 1 ke PLTP. Tujuan dari penelitian ini untuk mengidentifikasi struktur lapisan bawah permukaan longsoran di area rocky wall dan untuk memprediksi kedalaman bidang gelincir (slip surface) berdasarkan nilai resistivitas lapisan tanah dengan metode geofisika ERT, sehingga metode geoteknik yang dipilih untuk penanganan longsor adalah tepat. Penelitian ini dilakukan dengan metode geofisika Electrical Resistivity Tomography (ERT) konfigurasi Wenner, Schlumberger dan Dipole-dipole dengan Ares II (Automatic Resistivity System II) sebagai peralatan utama ERT yang digunakan dalam pengambilan data. Luas daerah penelitian adalah 150 m × 200 m dengan jumlah pengukuran sebanyak 4 lintasan. Dari hasil pengolahan data pengukuran resistivitas menggunakan perangkat lunak Res2dinv dan Zondres2D, hasilnya menunjukkan bahwa sebaran batuan di daerah longsor rocky wall didominasi oleh lapisan breksi andesit lapuk dan lanau berpasir berlempung. Berdasarkan back analysis dan analisis stabilitas lereng sebelum kondisi longsor terjadi dan setelah longsor terjadi menggunakan Slope/W, didapatkan lapisan yang berpotensi menjadi bidang gelincir berkesesuaian pada kedalaman 10,43 m di bawah permukaan lereng.

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