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Dwiyanto Joko Suprapto
Program Studi Teknik Geologi Universitas Diponegoro, Semarang
Earth & Planetary Sciences

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 1 
EVALUASI GROUTING PADA SECTION RETAINING WALL – B (DOWNSTREAM) DI KALI SEMARANG, KELURAHAN PANGGUNG LOR, KOTA SEMARANG, JAWA TENGAH Khalaksita Amikani Asbella; Dwiyanto Joko Suprapto; Fahrudin Fahrudin; Citra Ningtyas
Geological Engineering E-Journal Vol 6, No 1 (2014): Volume 6, Nomor 1, Tahun 2014
Publisher : Program Studi Teknik Geologi, Fakultas Teknik, Universitas Diponegoro

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Abstract

Kali Semarang is one of the watering pattern that was in Semarang, Central Java, which runs from Pandanaran heading north toward the Java Sea. At the time of Semarang and surrounding areas have a condition that there are no rocks exposed at the surface because it is an area of older alluvium and river stage consisting of loose material such as clay, so this area has soft soil conditions until very soft. Lowering occurs in the area of construction of the embankment caused by the soft soil in the area around the construction of the embankment. Judging from the condition of the soil is soft and very soft, so we must be careful in determining the appropriate and correct methods for prevention of ground movement. Based on the soil conditions in the area of Kali Semarang, a study was undertaken using data SPT (Standard Penetration Test) to see the condition of the soil strength, and then to increase the strength of the soil used a method which is the method of grouting.From the results of drilling conducted at the Gate House point E1 +10 m, known at depth 0-2 m of sand sized loose gravel gray. At a depth of 2-20 m in the form of clay sized soft to very soft with gray. From SPT test data at Gate House point E1 +10 m, obtained N - SPT values <2 (very soft) at a depth of 2.8 to 5.8 m and a depth of 10.4 to 11.7 m. 2-3 N - SPT values (soft) is at a depth of 7.8 to 8.8 m and a depth of 13.4 to 19.3 m. SPT N - values (very dust) contained in an area close to the surface that is at a depth of 1.4 m.Once implemented method of grouting on Retaining Wall section B point 13 +1 m, +2 m point C10, and C18 +2 m point, a change in the value of the SPT test that the higher the value of N-SPT 4 (very dust) its value changed to 10 -15 (rather dense). N-SPT value of 0-1 (very soft), and the N-SPT values 2-3 (soft) turned into a N-SPT values 3-4 (soft), the value of N-SPT 5-7 (firm,) and N-SPT values 8-13 (stiff). To pile foundation bearing capacity changes from 16.57 tons to 35,98 tons to 53,03 tons. From the results of this investigation obtained good results for the purpose of grouting method successfully to increase the carrying capacity of the soil at the study site.Judging from its success with the implementation of the construction of grouting method can be resumed because the carrying capacity of the land has allowed it to withstand the load of the building to be erected.
PENYELIDIKAN GEOLOGI TEKNIK UNTUK PEMBANGUNAN TANGGUL KALI LOROK PACITAN JAWA TIMUR Setiono Setiono; Dwiyanto Joko Suprapto; Wahju Krisna Hidajat
Geological Engineering E-Journal Vol 6, No 1 (2014): Volume 6, Nomor 1, Tahun 2014
Publisher : Program Studi Teknik Geologi, Fakultas Teknik, Universitas Diponegoro

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Abstract

Lorok river, Pacitan, East Java is one of the river is located in the south eastern part Pacitan. In this area often flooded due to overflow of river water discharge during the rainy season and at high tide the sea water so that it can be detrimental to the public around the area of research which is along the river flow Lorok. Therefore, the government will undertake the construction of a dike to overcome these problems.In the present study, namely on engineering geology investigation for the construction of levees on the river wall, which aims to determine the condition of the surface geology and subsurface engineering research sites, determine the feasibility of levee, giving advice and know the location, quantity and quality of borrow. So as to provide development planning parameters embankment at the study site.To carry out the construction of the embankment should be known geological conditions of the surface and subsurface techniques. The method used in this study is the investigation of the surface engineering geological and engineering geological mapping subsurface geothecnical investigation with core drilling methods, sondir test and test pit. Mapping of engineering geology carried out in the vicinity of the study. Core drilling carried out by 10 points the BH - 1, BH - 2, BH - 3, BH - 4, BH - 5, BH - 6, BH - 7, BH - 8, BH - 9, BH - 10 with the depth of each point 10 meters. Sondir test conducted by 10 points the SD - 1, SD - 2, SD - 3, SD - 4, SD - 5, SD - 6, SD - 7, SD - 8, SD - 9, SD - 10 with varying depths . In this research, the search pile material in a way to make a well test ( test pit ) by 2 points the TP - 1 and TP - 2. In this investigation will produce approximately engineering geology maps and cross sections of the river flow subsurface engineering geology around the flow of the river.Based on the results of the analysis of the data that had been collected earlier, the recommended embankment foundation planning on hard ground or on rocks. Engineering geology cross-section can show the bedrock or rock beneath the surface as well as the physical and mechanical properties of soil or rock that is on site research.
PEMETAAN GERAKANTANAH DAN ANALISIS KESTABILAN LERENG DESA GONDANGLEGI, KECAMATAN KLEGO, KABUPATEN BOYOLALI, JAWA TENGAH Fakhlove Wardhani; Dwiyanto Joko Suprapto; Wahju Krisna Hidajat; Citra Ningtyas
Geological Engineering E-Journal Vol 6, No 1 (2014): Volume 6, Nomor 1, Tahun 2014
Publisher : Program Studi Teknik Geologi, Fakultas Teknik, Universitas Diponegoro

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Abstract

Massmovement disaster is very harmful, because it can damage various infrastructure facilities. Gondanglegi villages, subdistricts Klego, Boyolali district, Central Java, an area that suffered massmovement was quite severe in recent years.To find out how prevention of landslides in the study location so that need to do geotechnical investigations surface and subsurface. Surface investigations conducted by geotechnical mapping aimed to find out surface conditions that include geotechnical conditions and the direction of ground motion distribution / landslides. While subsurface investigation conducted by using data from the PT . Selimut Bumi Adhi Cipta form of with core drilling to a depth of 15 meters data which then laboratory testing, and also geoelectric investigation data.From the data results of the investigation like slope geometry, subsurface cross-section, the interpretation of landslide areas and mechanical properties of soil/ rock material slope stability analysis that using softwares like Slide version 8.0  and Phase ver 8.0.Based on the results of the slope stability analysis, slope conditions around the cross-section AA' and BB' classified as unsafe have a safety factor value ( Fs ) of 0.851 to 1.031. And the area around the cross-section CC' is safe, with a factor of safety value ( FS ) at 4.33Type of massmovement that occurs at the study location in the form is rotational slides with a speed that is classified as moderate massmovement caused by high levels of steepness of slopes and thick weathering materials and triggered by rainfall and human activities.Alternative of prevention to do is cut off the top of the slope, cut down slope, installing gabion stone, make some retaining walls and grouting.
PERENCANAAN PERKUATAN LERENG PERUMAHAN CITRALAND MANADO, SULAWESI UTARA Fredy Aditya Yulianto; Dwiyanto Joko Suprapto; Prakosa Rachwibowo
Geological Engineering E-Journal Vol 6, No 2 (2014): Wisuda Periode Juli - Oktober 2014
Publisher : Program Studi Teknik Geologi, Fakultas Teknik, Universitas Diponegoro

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Abstract

Movement of soil often found in the State of Indonesia and is one of the natural disasters that can damage and harm humans each year. Indonesia most of the territory is hilly and mountainous, it is what makes our country vulnerable to catastrophic ground motion. This condition coupled with high rainfall as a trigger of ground motion. PT. Ciputra International is one company that is engaged in the development of housing. Housing development in the implementation problems encountered Citraland Manado local ground motion (local). Even landslides in Cluster 4 Eden Bridge damage homes and 6 people died. The cause of the avalanche is the presence of high rainfall and the presence of cracks in the rocks of the area. In anticipation of this problem, mapping and planning geotechnical slope reinforcement. Some of the data that is needed is the type of rock, heavy rock, fracture conditions, slope geometry, and rock mechanics of data. The lithology of the research sites is a tuff, sand gravel, volcanic breccias, soil embankment and sand. Based on the research generated sites prone to landslides for slope stability analysis is then performed using the software slides and phase2. The location of the Church of the Holy Kalam and Northern Hill still potentially complex landslide, being Cluster Eden Bridge is secure. At the location of the Church of the Holy Kalam, which meets the safety factor in both dry and water-saturated conditions are 1.423 and 1.349 which is a combination between the anchor and grouting grouting on the slopes and at the summit. While the location of the Northern Hill barrow, which meets the safety factor in both dry and water-saturated conditions are 1.505 and 1.494 which is the slope reinforcement using grouting.
KAJIAN POTENSI BAHAN GALIAN PASIR – KERAKAL DI SUNGAI BARO, KABUPATEN PIDIE, PROVINSI NANGGROE ACEH DARUSSALAM Januar Aziz Zaenurrohman; Dwiyanto Joko Suprapto; Fahrudin Fahrudin
Geological Engineering E-Journal Vol 6, No 1 (2014): Volume 6, Nomor 1, Tahun 2014
Publisher : Program Studi Teknik Geologi, Fakultas Teknik, Universitas Diponegoro

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Abstract

The necessity of sand gravel in the development is become larger along with the advance of economic and population growth. Baro river has big enough natural resources in the form of excavated materials such as sand and gravel. Because of that reason, the stock taking of sand and gravel materials is needed in Baro river to serve as reference for the Government about the potential of owned excavated materials. Study about the potential of excavated minerals in Baro river is done in the form of research such as surface geological mapping, geoelectric survey, test pit, measurements of potential spacious and volume, as well as economic analysis. From the above researches, the informations obtained are about the potential area of the minerals, the quality of sand – gravel materials through the laboratory test, and the economical feasibility.In the research location, there are found excavated materials in the form of sand – gravel with the potential area and volume that can be mined appropriated with the government regulation is about 2.997.319,15 m2. The volume of excavated materials is about 14.986.595 m3 with the depth of 5 meters. The result of laboratory test, the grain size is dominated by gravel and sand with the percentage of gravel is about 28,41% up to 66.53%, the percentage of sand is about 33.21% to 71,44%, and the percentage of silt and clay about 0.10% to 0.48%. According to loss angeles abrassion test, the maximum value is 43.70% and minimum value is 38,53%. As well as the results of soundness test, the maximum value is 0,239%, making the aggregate is very resistant to weathering process. In the economical analysis, the result of the NPV >0, BCR > 1, and IRR > MARR with the value about 7.5%, so that mean the location is recommended for mined economically.
Co-Authors Citra Ningtyas Citra Ningtyas Fahrudin Fahrudin Fakhlove Wardhani Fredy Aditya Yulianto Januar Aziz Zaenurrohman Khalaksita Amikani Asbella Prakosa Rachwibowo Setiono Setiono Wahju Krisna Hidajat