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Trihanyndio Rendy Satrya
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SEEPAGE MODELING IN EMBANKMENT DAMS WITH VARIOUS SUB SOIL CHARACTERISTICS Almaretha Mevia Azizah Putri Iswanto; Wasis Wardoyo; Trihanyndio Rendy Satrya
Journal of Civil Engineering Vol 37, No 1 (2022)
Publisher : Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j20861206.v37i1.12431

Abstract

The embankment dam has the advantage that it can be built in all sub-base conditions although poor topography, but the weakness is seepage, so research on seepage is needed. This study uses numerical modelling with the GeoStudio program: SEEP/W and SLOPE/W. The data used is data from the Tugu Dam, Trenggalek, while the subbase data used five soil types, namely clay, silty clay, silt, silty sand, and sand. This research simulation is divided into two; the first simulation is the condition of the soil characteristics remains with the water level increasing every 5 meters from the base elevation of the dam to below the floodwater level;. In contrast, the second simulation is the condition of the water level elevation remains constant, but the soil characteristics change. Each simulation will be checked for seepage discharge and soil stability. The first simulation results show that seepage discharge and water level elevation have a logarithmic correlation with R2 > 0.75. The largest seepage discharge of 1,90 x 10-3 m3/s is sand soil, while the smallest is clay soil of 1,47 x 10-9 m3/s. The results of the second simulation show that the seepage discharge and saturated volumetric water content also have a logarithmic correlation, but some results cannot be used because they have an R2 value < 0.75. From the two simulations, the seepage discharge that occurs is said to be safe because it is below the average annual runoff which is 1% of the 10-year re-flood discharge calculated using the Nakayasu Synthetic Unit Hydrograph (HSS) which is 5.99 m3/s, and the safety factor of slope stability is > 1.2 then the dam is considered stable.
COMPARATIVE STUDY OF SINGLE STEEL PILE BEARING CAPACITY BETWEEN GEO5 SOFTWARE AND EMPIRICAL FORMULA METHOD Dwi Imam Riva&#039;i; Yudhi Lastiasih; Trihanyndio Rendy Satrya
Journal of Civil Engineering Vol 37, No 2 (2022)
Publisher : Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j20861206.v37i2.13694

Abstract

Abstract: Pile foundation is a part of the Sub-structure that is used to receive and distribute loads from the superstructure to the ground at a certain depth, where it requires suitable bearing capacity. Empirical formula is the one of the methods for calculating pile bearing capacity that based on Standard Penetration Test (SPT) value. This method consumes plenty of time compared with the current method using Geo 5 software. However, the pile bearing capacity results among these methods should be verified beforehand. Therefore, it is necessary to do a comparison of pile bearing capacity laid on various soil types between the empirical formula and the Geo5 program based on SPT data to obtain the value of the correction factor and to find out which method is nearest to the Geo5 software. The Luciano decourt empirical method results are closer to the Geo5 software for all soil types, both of the end bearing and floating pile conditions with ratio values of 0.90 and 1.09 for dominant clay, 0.97 and 0.96 for dominant silt, and 0.84 and 0.89 for dominant sand. As for the Bazaara Empirical Method, the results are closer to the Geo5 program for the dominant group of sand in floating pile conditions with a ratio value of 0.99. Hence, the Luciano Decourt's empirical formula is more recommended than Bazaara's empirical formula.
ASSESSMENT TO THE PILE BEARING CAPACITY OF INJECTION PILE BASED ON PILE DRIVING ANALYZER AND RE-INJECTION TEST RESULTS (CASE: EASTKAL PENAJAM PROJECT) Trihanyndio Rendy Satrya; Musta’in Arif
Journal of Civil Engineering Vol. 34 No. 2 (2019)
Publisher : Institut Teknologi Sepuluh Nopember (ITS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j20861206.v34i2.7442

Abstract

Injection piling method was used as the main pile driving method at the three warehouses in the Eastkal Penajamproject, Kalimantan, Indonesia. The sub-soil compositions are dominated by clay and sandy soil with very soft to mediumconsistencies. By using injection pile equipment, it is possible to measure the pile bearing capacity from the loading gauge.Since the soil is dominated by clay, the friction capacity overtime will be improved. For that purpose, the piles were re-injectedagain after 3, 10, 11, and 25 days. To establish the forecasting expression of pile bearing capacity enhancement for other piles,non-linear regression analysis was performed. To verify the result, pile driving analyzer (PDA) test for selected piles wascarried out. The results from PDA test were further analyzed by using both direct fields reading in the PDA data logger and theCase Pile Wave Analysis Program (CAPWAP). A linear regression analysis was carried out to complete the blank data due tothe field measurement limitation. In addition to the obtained field data, theoretical analysis of pile bearing capacity with LucianoDecourt method is carried out. From the comparisons of all data, it can be concluded that re-injection pile method provides thehighest safety factor followed by PDA test, CAPWAP analysis, and theoretical design calculation with Luciano Decourt method.
COMPARATIVE STUDY OF SINGLE STEEL PILE BEARING CAPACITY BETWEEN GEO5 SOFTWARE AND EMPIRICAL FORMULA METHOD Dwi Imam Riva&#039;i; Yudhi Lastiasih; Trihanyndio Rendy Satrya
Journal of Civil Engineering Vol. 37 No. 2 (2022)
Publisher : Institut Teknologi Sepuluh Nopember (ITS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j20861206.v37i2.7617

Abstract

Pile foundation is a part of the Sub-structure that is used to receive and distribute loads from the superstructure to the ground at a certain depth, where it requires suitable bearing capacity. Empirical formula is the one of the methods for calculating pile bearing capacity that based on Standard Penetration Test (SPT) value. This method consumes plenty of time compared with the current method using Geo 5 software. However, the pile bearing capacity results among these methods should be verified beforehand. Therefore, it is necessary to do a comparison of pile bearing capacity laid on various soil types between the empirical formula and the Geo5 program based on SPT data to obtain the value of the correction factor and to find out which method is nearest to the Geo5 software. The Luciano decourt empirical method results are closer to the Geo5 software for all soil types, both of the end bearing and floating pile conditions with ratio values of 0.90 and 1.09 for dominant clay, 0.97 and 0.96 for dominant silt, and 0.84 and 0.89 for dominant sand. As for the Bazaara Empirical Method, the results are closer to the Geo5 program for the dominant group of sand in floating pile conditions with a ratio value of 0.99. Hence, the Luciano Decourt's empirical formula is more recommended than Bazaara's empirical formula.
BEHAVIOR OF NATURAL AND TREATED SOIL WITH MICROORGANISMS UPON VARIOUS WATER CONTENT DUE TO DYNAMIC LOAD Albert Allowenda PS; Ria A. A. Soemitro; Trihanyndio Rendy Satrya
Journal of Civil Engineering Vol. 37 No. 1 (2022)
Publisher : Institut Teknologi Sepuluh Nopember (ITS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j20861206.v37i1.7622

Abstract

The use of microorganisms such as fungus or bacteria as stabilizers in soil stabilization was not so often being practised or experimented with in the field. Also, there was so little information about this type of stabilization being carried out even in a minor scale experiment such as a laboratory experiment. A previous study using a fungus with the type of Rhizopus oligosporus resulted in a significant increase in soil consistency under certain water content conditions in the soil with a high percentage of the sand component. Therefore, this experiment is intended for analyzing loose sandy soil in Kulonprogo where the New Yogyakarta International Airport was built and the soil itself was highly saturated and vulnerable to experiencing liquefaction phenomenon. Liquefaction is a condition in highly saturated loose sandy soil where highly excess pore water pressure causes the loss of effective stress between soil particles simultaneously due to dynamic load and it will have an impact on building damage or failure laid on that type of soil. Therefore, an experimental model was carried out to analyze the behaviour of loose sandy soil when stabilized with Aspergillus fungus as the microorganisms. The soil stabilized by Aspergillus will be tested for liquefaction due to dynamic load and it will analyze the changes in soil parameters after the soil stabilization. The experiment shows that the appropriate percentage of soil mixture consists of ordinary sand with a percentage of 62% plus silt and clay with a percentage of 38%. Aspergillus fungus isolates at a concentration of 10-2 showed good tissue growth without the presence of foreign substances. Based on the results of the shear strength test in the form of Triaxial UU (Unconsolidated Undrained) experiment on remoulded soil that was given a stabilizer in the form of Aspergillus, it increased the cohesion parameter (c) when the remoulded soil was given Aspergillus with a percentage of 6% at a water content of 48,5%. From the soil parameters, liquefaction analysis is performed and resulted that there was still a high probability of liquefaction occurring because, from the analysis, the safety factor (SF) was lower than the minimum safety factor (SF) required.
SEEPAGE MODELING IN EMBANKMENT DAMS WITH VARIOUS SUB SOIL CHARACTERISTICS Almaretha Mevia Azizah Putri Iswanto; Wasis Wardoyo; Trihanyndio Rendy Satrya
Journal of Civil Engineering Vol. 37 No. 1 (2022)
Publisher : Institut Teknologi Sepuluh Nopember (ITS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j20861206.v37i1.7630

Abstract

The earthfill dam might be built for all subsoils condition, however the common problems are the seepage flow and dam stability. This study uses numerical simulation model for seepage discharge and slope stability analysis. The characteristic of the dam is obtained from Tugu Dam, Trenggalek, while the subsoil data is varied for five soil types which are clay, silty clay, silt, silty sand, and sand. The first simulation analyze certain subsoil type during various water levels, while the second simulation analyze certain water level elevation during various soil types. Each simulation will be analyzed for seepage discharge and slope stability. The first simulation results show that seepage discharge and water level elevation have a logarithmic correlation with R2 > 0.75. The largest seepage discharge at 1.90 x 10-3 m3/s is sand soil, while the smallest is clay soil at 1.47 x 10-9 m3/s. The results of the second simulation show that the seepage discharge and saturated volumetric water content also have a logarithmic correlation. Based on these two simulations, the seepage discharge still meets the requirement since plotted below the average annual runoff, which is 1% of the 10-year re-flood discharge. The amount of re-flood discharge is calculated using the Nakayasu Synthetic Unit Hydrograph (SUH) which is 5.99 m3/s. The safety factor of slope stability is more than 1.2 which is considered as stable dam.
Co-Authors Albert Allowenda PS Almaretha Mevia Azizah Putri Iswanto Almaretha Mevia Azizah Putri Iswanto Dwi Imam Riva&#039;i Dwi Imam Riva&#039;i Musta’in Arif Ria A. A. Soemitro Wasis Wardoyo Yudhi Lastiasih