JOURNAL TEKNIK SIPIL DAN INFRASTRUKTUR
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KAJIAN DAMPAK PERUBAHAN PENGGUNAAN LAHAN TERHADAP DEBIT ALIRAN DAS CIUJUNG
Full text linkCiujung Watershed is considered as one of major watershed in Banten Province related to floods that take place almost every year in the area. The study aims to assess landuse change and its influence on discharge. Watershed conditions such as precipitation, discharge, peak discharge, volume rate of discharge, and runoff were analyzed in two periods: 1999-2003 and 2004-2011. Landuse changes were analyzed in 8 years period (2003-2011) as well as its influence on discharge. Average annual precipitation in the period of 1999-2003 and 2004-2011 are 2370 and 2419 mm respectively. Average annual discharge in the period of 2004-2011 increased by 15% compared to the period of 1999-2003. Watershed conditions analysis indicates that Ciujung watershed quality decreased with increasing in surface runoff coefficient with values of 0.43 (period 1999-2003) and 0.48 (period 2004-2011). The study showed that there are several decreasing landuses during period 2003-2011 such as open land, natural forest, mixed dry land farming, secondary dry forest, primary dry forest, and dry land farming by 47.4; 14.3; 8.4; 2.9; 1.6 and 0.1% respectively. Several increasing land uses during the period including bush, plantations, settlements, and paddy field by 1,974.5; 5.5; 3.8 and 0.9% respectively. Keywords: discharge, land use change, peak discharge, runoff Ciujung Watershed is considered as one of major watershed in Banten Province related to floods that take place almost every year in the area. The study aims to assess landuse change and its influence on discharge. Watershed conditions such as precipitation, discharge, peak discharge, volume rate of discharge, and runoff were analyzed in two periods: 1999-2003 and 2004-2011. Landuse changes were analyzed in 8 years period (2003-2011) as well as its influence on discharge. Average annual precipitation in the period of 1999-2003 and 2004-2011 are 2370 and 2419 mm respectively. Average annual discharge in the period of 2004-2011 increased by 15% compared to the period of 1999-2003. Watershed conditions analysis indicates that Ciujung watershed quality decreased with increasing in surface runoff coefficient with values of 0.43 (period 1999-2003) and 0.48 (period 2004-2011). The study showed that there are several decreasing landuses during period 2003-2011 such as open land, natural forest, mixed dry land farming, secondary dry forest, primary dry forest, and dry land farming by 47.4; 14.3; 8.4; 2.9; 1.6 and 0.1% respectively. Several increasing land uses during the period including bush, plantations, settlements, and paddy field by 1,974.5; 5.5; 3.8 and 0.9% respectively. Keywords: discharge, land use change, peak discharge, runof
PENUAAN DINI DAN DURABILITAS PERKERASAN LAPIS TIPIS BETON ASPAL LAPIS AUS (HRS-WC) YANG MENGGUNAKAN ROADCEL-50
Full text linkRoadCel-50 is an added material that has been used in asphalt pavement such as HRS. Its purpose is to improve the stability of the asphalt pavement. However, the effect of the use RoadCel-50 on short term aging and durability of asphalt pavement is very important to understand. The objective of this study was to determine the effect of RoadCel-50 on short term aging and durability of the pavement Hot Rolled Sheet Wearing Course (HRS-WC). This research was conducted with the percentage of the RoadCel-50 are 0%, 0.1%, 0.2%, 0.3% and 0.4%. This research was done at the Laboratory of Transportation and Highways Department of Civil Engineering Faculty of Engineering, Tadulako University, Palu Central Sulawesi. The main equipment used in this study is Marshall testing machines. Manufacturing and testing of samples were conducted at STOA conditions. The results of this study on the the condition of short term aging (STOA) shows that the use of RoadCel-50 can increase the stability of the pavement on the the percentage RoadCel-50 of 0.30% and Asphalt content of 7.7% which is 2281.40 kg. Stability in the condition STOA declined in the percentage RoadCel-50 of 0.40% and Asphalt content of 7.5% at 1178.87 kg. Applying RoadCel-50 on the HRS-WC can improve durability on the percentage RoadCel-50: 0.10% with 7.5% bitumen content. Keywords: Roadcel-50, Short term aging, HRS-WC, STOA
KAJIAN PENGARUH JUMLAH DAN LEBAR PERKUATAN GEOTEKSTIL TERHADAP DAYA DUKUNG TANAH GAMBUT
Full text linkPeat soils have a high compressibily and low bearing capacity. These unfavorable characteristics can cause differential settlement and the construction failure, so that the appropriate improvement methods are required to solve the problems. Peat soil improvement methods that commonly used are mechanical and chemical improvement methods. In this research, the peat soil reinforced with geotextile was conducted in order to find the influence of the reinforcement in increasing the bearing capacity. Reinforcement was applied to the construction model with variation in the number of reinforcement which were N=1, N=2, N=3, and reinforcement width which were 2B, 3B and 4B (B is foundation width in scale). The results show that the insertion of geotextile sheets in peat soil can increase the bearing capacity of the soil foundation. The increasing of the bearing capacity is proportional to the increasing of the number and width of the geotextile. Variation in reinforcement width is given more influence in increasing the ultimate bearing capacity (q) compare to variation in the number of reinforcement. Compare to the modeled construction without reinforcement, the maximum bearing capacity increase as much as 232.3 % and BCR as of 3.32 with reinforcement width of 4B and N=3.Key words: peat, reinforcement, bearing capacit
STUDI KARAKTERISTIK PASIR SIURI DENGAN PENAMBAHAN BUTIRAN HALUS NONPLASTIS (STUDI KASUS FC
Full text linkPhysical and mechanical properties of uniform sand (Siuri sand) mixed with fine grains is not the same as pure uniform sand, and the void ratio (e) can not be considered as appropriate index to describe the microstructure changes due to the fine grains. Thus, the use of intergranular void ratio is recommended for the condition of fine content less than the threshold fine content (FC <FCth). In this article, the primary data were obtained by conducting laboratory tests, by testing the physical and mechanical properties of the mixtures. Tests were carried out on pure Siuri sand (0%), pure non-plastic fines (100%), and the mixtures with fine content variations of 10% - 90% (by weight of mixture), however, the discussion were focused on dominant coarse grain conditions which was pure Siuri sand (0%) and the mixtures with non-plastic fine composition varied as 10%, 20%, 30% and 40%. The results show that the changes in content of non-plastic fines combined with Siuri sand showed characteristic changes in a similar pattern both in physical and mechanical properties. Fines addition to Siuri sand had increased the value of some parameter (gd, gdmax, gdmin, f, dan t) and had decrease some other parameter (e, emax, dan emin) up to the 30% fine content, then the opposite occured in 40% fine content. When fine content had exceed threshold fine content (FCth) which were between 30-40%, it showed a behavior transition, from behavior of higher contribution of sand in the mixture (dominance of sands) to higher contribution of fines (dominance of fines). Keywords: void ratio, intergranular void ratio, shear strength, Siuri San
PERENCANAAN BAK PENGENDAPAN DAN PENAMPUNGAN AIR YANG BERASAL DARI MATA AIR DI KECAMATAN LAMALA
Full text linkDistrict of Lamala Regency of Luwuk is the area in which shortage of water and difficulty in supplying the water needs of its population. This planning study aims to address the fresh water problem and determine the needs of fresh water , especially three villages in the District of Lamala namely village of Bonebabakal, Lomba and Poroan.The study was conducted by collecting primary data and secondary data, as well as direct observation in the field. Furthermore, to drain the water from the spring water to the deposition basin of 20m3 and reservoir basin of 50m3 at a service area with a distance of 3 km from the source and height difference of 128 meters can utilize the force of gravity. From the research, the spring discharge data obtained at 20.1 liters / sec and to meet the needs of local water services up to year 2031 the population projection can be calculated using the arithmetic and geometric methods.As a suggestion to optimize the volume of water , it should be made on the fresh water catchers building in the location of water springs as well as the manufacture of bags to drain the sediment sludge coming from the spring. Keywords: depositional basin, reservoir, spring
PENJADWALAN PROYEK PEMBANGUNAN GEDUNG RESEARCH CENTRE UNIVERSITAS TADULAKO DENGAN MENGGUNAKAN MICROSOFT PROJECT
Full text linkProyek konstruksi merupakan aktivitas pekerjaan yang memiliki karakteristik unik yang tidak berulang, di mana proses yang terjadi pada suatu proyek tidak dapat diulangi pada proyek lainnya. Berkaitan dengan masalah proyek ini maka keberhasilan pelaksanaan sebuah proyek tepat pada waktunya merupakan tujuan yang penting, oleh karena itu diperlukan persiapan berupa perencanaan dan penjadwalan yang efektif. Penjadwalan yang efektif adalah menjadwal kegiatan dengan urutan kerja yang logis sehingga meminimalisir peluang keterlambatan suatu proyek. Penelitian ini bertujuan untuk membuat penjadwalan kembali proyek pembangunan gedung Research Centre Universitas Tadulako dengan menggunakan Microsoft Project 2007. Dari hasil penelitian disimpulkan bahwa penjadwalan dengan menggunakan Ms. Project 2007 diperoleh waktu pelaksanaan pekerjaan pembangunan gedung Research Centre Universitas Tadulako sekitar 230 hari untuk menyelesaikan rangkaian aktivitas. Sedangkan penjadwalan yang direncanakan oleh pihak pelaksana pekerjaan pembangunan gedung Research Centre Universitas Tadulako adalah 240 hari. Jika dibandingkan maka penjadwalan dengan Ms. Project lebih cepat 10 hari. Kata kunci: Proyek, Penjadwalan, Waktu, Ms. Projec
PENGEMBANGAN JARINGAN DISTRIBUSI AIR BERSIH KECAMATAN PELING TENGAH
Full text linkThis study aims to provide an overview of the development planning of water distribution networks in the village of Patutuki District of Peling Tengah, considering the region located in the coastal areas with limited of surface water sources, moreover the constriction and leakage in pipelines and water quality containing calcium or poor maintenance, so the flow of water to the consumer is reduced. The scope of study is limited to the analysis of the availability of water discharge mainstay as one of the water sources in the village Patutuki using FJ. Mock and calculate the domestic water supply in the village of Patukuki District of Peling Tengah depended on the number of population. Furthermore, network planning distribution of domestic water in the service area by gravity through the branching system and closed pipes. For secondary data collection was carried out in the form of meteorological data, population data, topographic data and the data of land-use. Then calculate the water needs to be compared with the discharge mainstay. The result is the minimum river discharge mainstay of Bebek River which is the main water source to meet water needs in the area of service to 20 years .The maximum pressure meets the maximum permissible limit of 10 kg/cm2 and also meet the maximum speed limit is a maximum of 3 m3/sec. For the required number of plumbing needs in this plan that HDPE pipe ø 102 mm by 108 rods , PVC pipe ø 102 mm 33 rods , PVC pipe ø 76 mm 557 rods , and PVC pipe ø 51 mm 749 rods. Keywords: water distribution networks, domestic water, Peling Tenga
PERENCANAAN ALTERNATIF PONDASI KONSTRUKSI SARANG LABA-LABA PADA PALU GRAND MALL
Full text linkPalu Grand Mall located at Diponegoro street, West Palu districts, PERENCANAAN ALTERNATIF PONDASI KCentral Sulawesi using foundation Konstruksi Sarang Laba-Laba( KSLL ). TheKonstruksi Sarang Laba-Laba is a combination of continuous flat concrete slab foundation system with a soil improvement system. This system is specifically utilizes the ground as part of the foundation structure. The purpose of thisresearchare to redesign KSLL foundation that is qualified for qgross ≤ qijin.Parameters that used are sondir test results, borlog, as well as laboratory testing such as bulk density and coefficient of consolidation (Cv). The analysis begins with the soil classification, load analysis using SAP. Then calculate the bearing capacity of the foundation, the maximum soil stress, potential settlement, equivalent thickness, KSLLreinforcement dimensions, and RAB in Palu Grand Mall.Based onCPT test results on the location it was obtained that the soil classification is clay for soil at the depth of 0-12 m, clayey silt for soil at the depth 12-15 m and gravelly sand at a depth of 15-20 m. The results obtained from SAP is 356.80 ton for the maximum load. For one segment with a size of 8 mx 8 m the foundation bearing capacity was 335.54 ton/ m². Calculation of the area of load distribution which is reviewed each segment was 11.599m² for construction rib and 11.034 m² for ribsettlement. Control of qgros and qall are met, which a rib construction is qgros 30.762 t/m² <qall335.545 t/m² and rib settlement qgros 32.337 t/m² <qall335.545 t/m². From the calculation it was obtained thatthe maximum soil stress are 3,613 t/m², the potential settlement 4,256 cm for a period of 12 years. Equivalent thickness of rib construction is 125 cm and 170 cm for rib settlement. The reinforcement in the rib construction and rib settlement are using the size of Ø10-15 cm (As = 471 mm²) on the condition ρmin< ρ < ρmax. The budget plan calculation results showed that for earthwork the budget is Rp. 13,948,320 and Rp. 130.620.019,77 for KSLL foundation work per segment Keywords: bearing capacity, settlement, foundations, konstruksi sarang laba-lab
RASIO HUBUNGAN NILAI DAYA DUKUNG TIANG PANCANG BERDASARKAN PENGUJIAN SONDIR, KALENDERING DAN TES PDA PADA JEMBATAN PELAWA KABUPATEN PARIGI MOUTONG
Full text linkBearing capacity of pile foundation bearing capacity is influenced by several factors, such as the amount of applied loads and non-homogeneous soil characteristics. To determine the bearing capacity of single pile foundation the static method is used on the basis of CPT data and dynamic methods based on dynamic pile and PDA tests. Pile foundations of the Pelawa bridge used in this study are located in the District of Parigi - Moutong. The study of literatures and secondary data such as the data of driven pile equipment, driven piles , CPT, dynamic pile tests, and PDA tests are used for analyzing the pile bearing capacity . Meyerhof method, Aoki de Alencar, LCPC, Price and Waldre, and Schmertmann are used to determine the bearing capacity of pile based on sondir (CPT) data. The dynamic pile tests data are used to calculate the bearing capacity of the piles by using methods of Hiley, Olsen and Flaate , Enginering News Record (ENR) , Janbu Mansur and Hunter , and AASHTO . The results show that the lowest dan the highest of the ultimate bearing capacities for static methods (CPT data) are 114.096 tons (Aoki De Alencar) and 305.479 tons (Schmertmann) respectively. Kalendering method (dynamic pile data) show that the lowest value of 284.22 tons were obtained from equation given by Hiley and the highest 1450.26 tons were obtained from equation given by Janbu.The range of 171.2 tons - 174.5 tons were given for PDA test data. The ratio between CPT to PDAs results that are closest to the value of 1 which is 0.938 is the value that obtained from Meyerhof’s equation, while the ratio between dynamic method (kalendering) to PDAs results that are closest to the value of 1 which is 1,660 is the value that obtained from Hiley equation Keywords: single pile bearing capacity, CPT, dynamic pile test, PDA tes
APLIKASI MODEL MANN-KENDALL DAN SEN’S (MAKESENS) UNTUK MENDETEKSI PERUBAHAN IKLIM
Full text linkVarious scientific studies illustrate that carbon dioxide (CO2) in the atmosphere layer that is a consequence of the result of the combustion of coal, timber, oil and gas, has increased by almost nearing 20 % since the start of the industrial revolution. Industrial area are built almost in the entire continent of the world has resulted in waste of “Greenhouse Gases (GHG) such as carbon dioxide (CO2), methane (CH4) and nitrousoksida (N2O) that caused the blanket effect. The purpose of this research was to detect the presence or absence of climate change and determine the projected climate change due to global warming. This research was conducted in the city of Palu, Central Sulawesi, using daily data and analyzed on a daily, monthly and yearly. Trend projections of climate change and changes in the method of analysis Makesens (Mann - Kendall and Sen 'S). The conclusion of this research is the change of climate in the city of Palu is characterized by slowly increasing temperature , increased precipitation and decreased evapotranspiration and the results of the calculation value of Z indicates Makesens method occurs climate trend, either positive direction (increasing) and negative (decreasing). Regression equation projected annual average temperature (as an example) is; f (year) = 0.018 (year - first year) + 26.931. Keywords: climate change, Makesens, Pal