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All Journal Fondasi: Jurnal Teknik Sipil
Fathonah, Woelandari
universitas sultan ageng tirtayasa
Civil Engineering, Building, Construction & Architecture Transportation

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MODELING OF WATER SEEPAGE AT SINDANG HEULA DAM Kusumaningrum, Winda; Purnaditya, Ngakan Putu; Fathonah, Woelandari; Priyambodho, Bambang Adhi; Subekti, Subekti; Nabila, Firyaal
Jurnal Fondasi Vol 13, No 2 (2024)
Publisher : JURUSAN TEKNIK SIPIL

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36055/fondasi.v13i2.29289

Abstract

A embankment dam is a dam built by stockpiling materials such as stones, gravel, sand, and soil on a certain composition with the function of carrying or lifting the water surface contained in the reservoir [1]. One of the structural safety of a embankment dam is against water seepage. Water seepage that occurs on the slope body during flooding can affect the decrease in slope stability, where the seepage will cause piping symptoms [2]. This study aims to determine the seepage discharge value that occurs in the dam body. The object of this study was Sindang Heula embankment dam in Banten Province. The method used is to conduct an analysis using GeoStudio software with the SEEP/W feature for seepage discharge. Simulation run in two scenarios as steady state condition and transient. Both scenario also run at least on three reservoir water level conditions. They are water level during flood, normal water level and half of full water level. Steady state condition gave seepage flux about 3.773×10-6 m3/sec/m2 as maximum value. In another hand, 30 days transient simulation gave maximum value about 8.7188×10-4 m3/sec/m2 and it occurred in small reference time after initial run. This study infomed that SEEP/W has capability to simulate water flux through porous media of embankment dam.
Stabilization of Expansive Clay Soil with Fly Ash and Ground Granulated Blast Furnace Slag Materials on UCT Values Kusuma, Rama Indera; Abdurrohim, Abdurrohim; Vihawian, Vini; Mina, Enden; Fathonah, Woelandari
Jurnal Fondasi Vol 13, No 2 (2024)
Publisher : JURUSAN TEKNIK SIPIL

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36055/fondasi.v13i2.28231

Abstract

Land is one of the important elements in construction projects and must have a high bearing capacity to support the structure above it. Civil construction, whether roads, buildings, or other structures, will last a long time if one of the factors is supported by a good subgrade. The location of the road in Sudimanik Village has soil classified as expansive clay, which has a high shrinkage capacity due to changes in water content. One way to improve unstable soil is by adding materials such as Fly Ash and Ground Granulated Blast Furnace Slag (GGBFS).The purpose of this study was to determine the characteristics of the soil based on the classification and physical properties of the soil using the Unified Soil Classification System method and to determine the characteristics of the soil and the effect of adding consistent variations of fly ash at 20% and variations in the percentage of GGBFS 0%, 10%, 20%, and 30% as additional material for soil stabilization against the Unconfined Compression Test value with variations in curing time of 0, 7, 14 and 28 days.The addition of fly ash and GGBFS/slag cement substantially increased the unconfined compressive strength of the soil over time. The maximum mixture for increasing the unconfined compressive strength was achieved with 20% fly ash and 30% GGBFS in variation E, indicating that this combination is very effective for increasing the soil strength in this area.
Flood Analysis of the Kedung Ingas River and Pabean River the Cilegon City Waita, Stanley Reynaldi Frits Sirway; Priyambodho, Bambang Adhi; Purnaditya, Ngakan Putu; Fathonah, Woelandari; Subekti, Subekti; Nabila, Firyaal
Jurnal Fondasi Vol 14, No 1 (2025)
Publisher : JURUSAN TEKNIK SIPIL

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62870/fondasi.v14i1.32284

Abstract

The Kedung Ingas River and Pabean River the Cilegon City often flood every year. It has an impact on losses and disruptions to public facilities and settlements such as highways, Cilegon Regional Hospital, Metro housing and residential areas located close to the river. The purpose of this study is to determine the amount of design discharge at 10, 25 and 50 years return period. The methods used to calculate the design flood discharge are Rational, Der Weduwen, and HSS Nakayasu. Based on the results of the study, the design flood discharge of the Kedung Ingas River and the Pabean River with Q10 = 121.25 m3/s, Q25 = 131.01 m3/s, and Q50 = 138.79 m3/s. The design flood discharge value used is the calculation value using the selected method, namely Nakayasu Synthetic Unit Hydrograph.
Stabilization of Expansive Clay Soil with Fly Ash and Ground Granulated Blast Furnace Slag Materials on UCT Values (Case Study: Jalan Desa Sudimanik Kec.Sudimanik, Kab Pandeglang, Banten) Kusuma, Rama Indera; Abdurrohim, Abdurrohim; Vihawian, Vini; Mina, Enden; Fathonah, Woelandari
Jurnal Fondasi Vol 13, No 2 (2024)
Publisher : JURUSAN TEKNIK SIPIL

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62870/fondasi.v13i2.32672

Abstract

Land is one of the important elements in construction projects and must have high bearing capacity to support the structure above it. Civil construction, whether roads, buildings, or other structures, will last a long time if one of the factors is supported by good subgrade. The location of the road in Sudimanik Village has soil that is classified as expansive clay, which has a high shrinkage capacity due to changes in water content. One way to improve unstable soil is to add additional materials such as Fly Ash and Ground Granulated Blast Furnace Slag (GGBFS).The purpose of this study was to determine the characteristics of the soil based on the classification and physical properties of the soil using the Unified Soil Classification System method and to determine the characteristics of the soil and the effect of adding consistent variations of fly ash at 20% and variations in the percentage of GGBFS 0%, 10%, 20%, and 30% as additional material for soil stabilization against the unconfined compressive strength value with variations in curing time of 0, 7, 14 and 28 days.The results of this study obtained soil classification according to the USCS classification including ML or inorganic silt and very fine sand, rock dust or fine silty or clayey sand. The plasticity index value after the study was 12.69%, in variation E, namely the addition of 20% fly ash and 30% GGBFS. The optimum qu value is in variation E with a curing time of 28 days, which is 2.287 kg / cm2. And experienced an increase in qu value of 295.918% from the original soil condition.
Study of Equilibrium Time in Wetting Soil-Water Characteristics Curves (SWCC) using Capillarity Column Method Nurjanah, Ina Asha; Kusumah, Rama Indera; Mina, Enden; Fathonah, Woelandari; Abdurohim, Abdurohim
Jurnal Fondasi Vol 14, No 1 (2025)
Publisher : JURUSAN TEKNIK SIPIL

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62870/fondasi.v14i1.32281

Abstract

The soil-water characteristic curve (SWCC) of soil plays the key roll in unsaturated soil mechanics which is a relatively new field. To encourage the geotechnical engineers to apply unsaturated soil mechanics theories in routine practice, numerical methods, based on the SWCC and saturated soil properties, have been developed to predict unsaturated permeability function and unsaturated shear strength properties which are expensive, time consuming, and it may require specials techniques or apparatus to measure the SWCC in laboratories. However, it is important to have laboratory measured data of SWCCs to enhance and verify the proposed numerical methods. Hence, employing the capillary column method which applies the tempe cell pressure principle, namely varying the matric suction value, this study aims to obtain the water content in each matric sauction variation which is then presented in SWCC form. Saturated permeability is obtained from constant head test. Permeability function is calculated indirectlt by Fredlund and Rahardjo method (1993) using SWCC and saturated permeability. 
Landslide Potential Analysis using Geographic Information System and Analytical Hierarchy Process (AHP) (Case Study: Taktakan District, Serang City) Mina, Enden; Fathonah, Woelandari; Kusumah, Rama Indera; Nurjanah, Ina Asha; Rafsanjaya, Aditiya
Jurnal Fondasi Vol 14, No 1 (2025)
Publisher : JURUSAN TEKNIK SIPIL

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62870/fondasi.v14i1.32283

Abstract

This research aims to analyze the landslide potential in Taktakan Sub-district, Serang City, which is prone to landslides due to geographical and hydrometeorological factors. The analysis was conducted using Geographic Information System (GIS) method with QGIS software and Weighted Linear Combination (WLC) approach combined with Analytical Hierarchy Process (AHP). Factors causing landslides, such as slope, rainfall, geology, and land use, were analyzed based on the weights obtained from respondents' questionnaires. The results showed that rainfall has the greatest influence (42%), followed by slope (37%), geology (11%), and land use (10%). The highest landslide potential is found in Taktakan sub-district, with the dominant vulnerability level in the medium class (50.73%), while the high and very high risk areas are 20.65% and 3.66%, respectively. This study concludes that high rainfall and steep slopes are the main factors that increase the risk of landslides in the area
Co-Authors Abdurohim, Abdurohim Abdurrohim, Abdurrohim Kusumah, Rama Indera Kusumaningrum, Winda Mina, Enden Nabila, Firyaal Nabila, Firyaal Ngakan Putu Purnaditya Nurjanah, Ina Asha Priyambodho, Bambang Adhi Rafsanjaya, Aditiya Rama Indera Kusuma Subekti, Subekti Vihawian, Vini Waita, Stanley Reynaldi Frits Sirway