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All Journal Bulletin of Scientific Contribution : Geology IJOG : Indonesian Journal on Geoscience Dharmakarya : Jurnal Aplikasi Ipteks Untuk Masyarakat Jurnal Ilmiah Dinamika Rekayasa (DINAREK) Journal of Geoscience, Engineering, Environment, and Technology Jurnal Geologi dan Sumberdaya Mineral (Journal of Geology and Mineral Resources) JLBG (Jurnal Lingkungan dan Bencana Geologi) (Journal of Environment and Geological Hazards) Buletin Sumber Daya Geologi Kumawula: Jurnal Pengabdian Kepada Masyarakat Journal of Geosciences and Applied Geology BACA: Jurnal Dokumentasi dan Informasi Jurnal Geosaintek

Zufialdi Zakaria, Zufialdi

Unknown Affiliation

Author-ID : 525619

Agriculture, Biological Sciences & Forestry Arts Humanities Civil Engineering, Building, Construction & Architecture Control & Systems Engineering Decision Sciences, Operations Research & Management Earth & Planetary Sciences Economics, Econometrics & Finance Education Electrical & Electronics Engineering Energy Engineering Environmental Science Industrial & Manufacturing Engineering Languange, Linguistic, Communication & Media Library & Information Science Physics Public Health Social Sciences

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The Effect of Surface Water On The Slope Of “X” Housing Gunung Geulis, Cimanggung District, Sumedang Regency Putri, Revena Denia; Sophian, Raden Irvan; Zakaria, Zufialdi; Khoirullah, Nur
Journal of Geological Sciences and Applied Geology Vol 5, No 2 (2021): Journal of Geological Science and Applied Geology
Publisher : Faculty of Geological Engineering, Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24198/gsag.v5i2.34638

Rainfall intensity can affect water infiltration to the ground. The increase in groundwater level will increase pore pressure (μ) that minimizes shear resistance of the slope mass, especially on the ground material (soil). The increase in surface water levels also increases surface water discharge and increases erosion below the surface (piping or subaqueous erosion). As a result of more subtle friction (silt) from the time that washed away soil, the soil will decrease future resilience. This happened in Subdistrict Cimanggung, Sumedang, West Java. This area is composed of weathered soil of volcanic products such as tuff, volcanic breccia, and andesitic lava. The parameters of this research contain basic properties and mechanical properties of soil, slope profile in MH soil, and water surface level. This research aims to determine basic properties and mechanical properties of soil, as well as the effects of groundwater level, that can give recommendations for groundwater level to get a stable condition of the slope. The basic properties and mechanical properties of soil are known based on laboratory tests from a disturbed and undisturbed soil sample were obtained by surface sampling and geotechnical hand drilling. Slopes were analyzed by the Bishop method using Rockscience Slide software. The result is there’s an increase in the value of safety factors when the level of surface water level decrease. From the value of the safety factor that varies between slope sections, that slope can be stable if water surface level -7,5 meters beneath the surface.

SOIL BEARING CAPACITY OF SHALLOW FOUNDATION BASED ON TERZAGHI METHOD IN CIPATAT, WEST BANDUNG, WEST JAVA Wicaksana, Kintan Adelia Arum; Zakaria, Zufialdi; Muslim, Dicky; Khoirullah, Nur
Journal of Geological Sciences and Applied Geology Vol 4, No 1 (2020): Journal of Geological Science and Applied Geology
Publisher : Faculty of Geological Engineering, Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24198/gsag.v4i1.28998

Infrastructure development is a common thing that happened in Indonesia, especially house construction that happened in Cipatat, West Bandung, West Java. One of the important things in construction is a foundation and one of the foundation’s types is a shallow foundation. Soil bearing capacity is one of several things that used to calculate foundation planning. This research is using the Terzaghi method for soil bearing capacity. The data was obtained by taking the disturbed sample from three different locations. Those samples were tested in a laboratory, the test is a direct shear test to know about soil bearing capacity's value. The result is soil bearing capacity value range between 5.47 ton/m2 - 26.52 ton/m2. That value for soil bearing capacity is categorized as low.

PERAN GEOLOGI TEKNIK DAN ANALISIS KEWILAYAHAN DALAM GEOLOGI MILITER DI INDONESIA Zakaria, Zufialdi
Bulletin of Scientific Contribution Vol 3, No 2 (2005): Bulletin of Scientific Contribution
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

Since ancient Chinesse era to World-War 2, knowledge of geoscience hold important role in themilitary world. Landscape analysis (potency and constraint) for military is needed to evaluate enemymovement and its war equipments, to determining access of location rute, to mapping hydrogeologysurface and underground for structural defence & military personnel and also for attack. Though Spot-5,Ikonos and Quickbird sattelite images’ exist, but map of military geology is necessary to remainingsurface material physical characteristic toward teritorial enemy and also to develop defence citadel.Map and scale of military geology based on engineering geology condition for need of military. Variationscale depend on needed, from big scale (most detailed) to small scale (regional).In Indonesia, Indonesian Association of Geologist (IAG) both Geological Research and DevelopmentCenter (GRDC) not had Unit of Military Geology yet. In America, Unit of Military Geology was formedsince 1942. This unit duty is complie terrain intelligence, how troops can be move in land; finding ofwater, fuel, mineral and construction material, solving construction problem and base landing plane.

Peran Ilmu Dasar dalam Geoteknik untuk Menunjang Pembangunan Berkelanjutan yang Berwawasan Lingkungan Zakaria, Zufialdi; Jihadi, Luthfan Harisan
Bulletin of Scientific Contribution Vol 14, No 3 (2016): Bulletin of Scientific Contribution
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

Geoteknik adalah salah satu dari cabang dari ilmu geologi yang erat hubungannya dengan pembangunan berkelanjutan yang berwawasan lingkungan. Kajian-kajian geoteknik memerlukan ilmu dasar seperti matematika, statistika, fisika, biologi, dan kimia. Beberapa kajian geoteknik berhubungan dengan pembangunan infrastruktur seperti jalan tol, jalan kereta api, jembatan, menara, pondasi gedung, desain lereng rekayasa, dan lain-lain. Makalah ini memperlihatkan beberapa penelitian geoteknik yang memanfaatkan ilmu dasar, yaitu desain lereng stabil, desain pondasi, hubungan antar variabel tanah, maupun perbaikan tanah. Penelitiannya a.l.: 1) Analisis kestabilan lereng, tujuan untuk mendapatkan lereng stabil, metode menggunakan model Starlet, hasil yang didapatkan adalah desain lereng stabil dan antisipasi keruntuhan lereng pada zona kerentanan gerakan tanah. 2) Analisis dayadukung tanah, tujuan untuk menentukan dayadukung yang aman bagi fondasi, metode yang digunakan adalah melalui cara Terzaghi, hasil yang didapatkan adalah nilai dayadukung tanah yang diijinkan untuk peletakan fondasi. 3) Soil improvement, tujuan untuk perkuatan fondasi, metode melalui pencampuran tanah dasar dengan kapur (CaO), hasil yang didapatkan adalah meningkatnya kekuatan dayadukung tanah pada tanah ekspansif. Kesimpulan dari semua penelitan geoteknik tersebut adalah kajian geoteknik tidak bisa lepas dari ilmu dasar matematika dan ilmu pengetahuan alam. Kata Kunci: geoteknik, pembangunan berkelanjutan, lereng stabil, dayadukung tanah, soil improvement Geotechnics is one of branches of geological science are closely related to environmentally sustainable development. Geotechnical studies require some basic sciences such as mathematics, statistics, physics, biology, and chemistry. Some geotechnical studies related to the development of infrastructure such as toll roads, railways, bridges, towers, building foundation, slope design engineering, and others. This paper shows some geotechnical studies that utilize basic sciences, namely: stable slope design, foundation design, the relationship between variables soil, and soil improvement. The study included: 1) Slope stability analysis, objective research is to get a stable slope, the method is using the Starlet model, the results obtained are stable slope design and anticipation of the slope landslide on vulnerability zone of mass movement, 2) Analysis of soil bearing capacity, in order to determine safety bearing capacity for the foundation, the method is using Terzaghi equtaion, the results obtained are allowable soil bearing capacity for safety foundation. 3) Soil improvement, the goal of strengthening the foundation, the basic method by mixing soil with lime (CaO), the results obtained are the increasing strength of the soil bearing capacity on expansive soil. The conclusion of all geotechnical research are geotechnical studies cannot be separated from the basic sciences of mathematics and natural science. Keywords: geotechnical, sustainable development, stable slope, soil bearing capacity, soil improvement

REKAYASA GEOTEKNIK DAYADUKUNG TANAH FONDASI DANGKAL (KONDISI LOCAL SHEAR) MELALUI STABILISASI TANAH DAN PENGELOLAAN LINGKUNGAN Zakaria, Zufialdi; Muslim, Dicky; Mulyo, Agung; Jihadi, Luthfan H.
Bulletin of Scientific Contribution Vol 12, No 3 (2014): Bulletin of Scientific Contribution
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

Soil bearing capacity for shallow foundations usually have problem on expansive soil. Value of soil bearing capacity is low because soil variable have low value. To increase the value of soil bearing capacity, the soil quality to be improved, namely the stabilization of the soil through the addition of CaO. The Soil bearing capacity for shallow foundation with Saftey Factor = 2 and depth 1 M on the local shear conditions have increased due to the addition of CaO with the following equation: 1) Footing square shape: qa = 2,6631CaO0,6057 (R² = 0,937; R= 0,97); 2) Footing circular shape: qa = 2,7611CaO0,5933 (R² = 0,9369; R= 0,97); 3) Footing continuous shape: qa = 1,702 CaO0,6764 (R² = 0,9393; R= 0,97). Environmental management for shallow foundations are required to avoid the numbers are still high activity (A> 1) and the change of CaO by acidic rain water. Environmental management for the foundation starts with selecting Safety Factor, and building load should not exceed the allowable soil bearing capacity accordance with Safety Factor chosen. The addition of CaO should not be excessive, it is recommended ratio 15% CaO of the native soil to do optimal mixing.

PENGARUH KEMIRINGAN LERENG TERHADAP LAJU SEDIMENTASI PADA RENCANA BENDUNGAN PARIGI Yusuf, Muhammad Farhan; Siahaan, Yakub; Sukiyah, Emi; Mulyo, Agung; Patonah, Aton; Zakaria, Zufialdi
Bulletin of Scientific Contribution Vol 16, No 2 (2018): Bulletin of Scientific Contribution GEOLOGY
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

Pembangunan Bendungan Parigi akan sangat bermanfaat untuk kepentingan masyarakat. Bendungan ini akan digunakan untuk keperluan pertanian (irigasi) dan persediaan air baku. Lokasi Rencana Bendungan Parigi terletak pada sub-DAS Parigi yang memiliki luas 57,98 km2. Dalam perencanaan bendungan aspek sedimentasi sangat penting. Aspek ini akan berkaitan dengan desain Bendungan. Pada DAS yang tidak terlalu luas, laju sedimentasi setara dengan laju erosi. Perhitungan laju sedimentasi dilakukan berdasarkan fungsi erosi dengan metode Universal Soil Loss Equation (USLE) dan SDR. Metode ini berhubungan dengan faktor – faktor yaitu erodibilitas tanah, curah hujan, tataguna lahan, dan topografi. Faktor kemiringan lereng erat kaitannya terhadap laju sedimentasi, penelitian ini akan membahas tentang peranan kemiringan lereng terhadap laju sedimentasi. Nilai laju sedimentasi hasil perhitungan menggunakan metode USLE yaitu sebesar 149,53 ton/ha/th. Hasil perhitungan statistik dengan metode regresi linier di dapat bahwa faktor kemiringan lereng berpengaruh signifikan terhadap laju sedimentasi dengan persamaan regresi Y’ = 15,32 + 7,313X. Nilai koefisien regresi (r) sebesar 0,697 menunjukkan bahwa ada hubungan yang kuat antara kemiringan lereng (X) dan laju sedimentasi (Y). Pengaruh yang diberikan oleh aspek kemiringan lereng terhadap laju sedimentasi adalah sebesar 48,6 %.

KERAPATAN KELURUSAN SUNGAI DI WILAYAH MAJALENGKA DAN HUBUNGANNYA DENGAN VARIABEL MEKANIKA TANAH: SUDUT GESER-DALAM Zakaria, Zufialdi; Sophian, Irvan
Bulletin of Scientific Contribution Vol 13, No 2 (2015): Bulletin of Scientific Contribution
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

Areas of the research include the role in The Eastern Zone of Bogor Basin. In this research are Research areas included in the Eastern zone Bogor Basin. In this research are discussed: 1) The role of tectonic and drainage lineament on Tertiary and Quaternary rocks in the study area; 2) The role of soil variables that are part of the parent rock material. The method used is a probabilistic analysis involving friction angle and lineament densty. The results showed: 1) The absence of differences in the direction of linemament drainage patterns on Tertiary and Quaternary rocks, indicating the influence of the deformation of the same, namely the upligt, the two rocks together to experience the rapture; 2) The density llinemanet associated with one variable, namely internal friction angle (phi). Internal friction angle (phi) decreases with increasing density lineament.

Identifikasi Gerakan Tanah (Longsor) di Kabupaten Garut, Jawa Barat Sabila, Zahra Syahida; Sukiyah, Emi; Alam, Boy Yoseph Cahya Sunan Sakti Syah; Zakaria, Zufialdi
Bulletin of Scientific Contribution Vol 16, No 1 (2018): Bulletin of Scientific Contribution GEOLOGY
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

Wilayah Kabupaten Garut, Provinsi Jawa Barat merupakan bagian dari zona gerakan tanah di Indonesia bagian barat. Indonesia bagian barat dibentuk akibat pengaruh tumbukan dua lempeng tektonik yaitu Indo-Australia dan Eurasia. Zona tersebut juga merupakan zona gempa dan zona gunungapi. Tanah residu yang tebal pada lereng dan curah hujan yang cukup tinggi di Jawa Barat merupakan salah satu penyebab daerah rawan longsor. Hal ini menjadi kendala bagi pengembangan wilayah Kabupaten Garut. Potensi gerakan tanah (longsor) pada daerah berlereng di Kabupaten Garut perlu mendapatkan perhatian. Sistem peringatan dini diperlukan untuk mengurangi potensi kebencanaan geologi gerakan tanah sehubungan dengan berbagai kegiatan atau proyek yang sudah ataupun akan dikembangkan.Kata Kunci: tektonik, gerakan tanah, sistem peringatan dini

PERBANDINGAN SOIL IMPROVEMENT PADA TANAH LAPUKAN BATUAN VULKANIK DI JATINANGOR, KABUPATEN SUMEDANG, DAN TANAH LAPUKAN BATUAN VULKANIK DI CIGINTUNG, MALAUSMA, KABUPATEN MAJALENGKA Zakaria, Zufialdi; Sophian, Irvan; Chaniago, Aulia Eka P S
Bulletin of Scientific Contribution Vol 15, No 3 (2017): Bulletin of Scientific Contribution:GEOLOGY
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

ABSTRACTSoil improvement is one of the methods of soil reinforcement. One method of soil improvement is the addition of soil with lime (CaO). The swelling soil (expanding when wet conditions, and shrinking when dry conditions) is identified from the value of soil activity. The behavior of soil activity decreases with increasing CaO, but for soils in weathered volcanic areas (volcanic breccia and lava) as in Jatinangor, with the value of high soil activity, the optimum addition of CaO to the soil is 15% and not more than 20%. Excessive addition of CaO tends to change the behavior of soil activity and increase the rate of activity. In the soil from weathered volcanic rock (tuff) as in Cigintung Village, District Malausma, in Majalengka, with the value of moderate to high soil activity, the addition of CaO is 15% to 20%. More than 20% CaO, activity number (A) decreases, but cohesion (c, Kg/M2) will decrease too, so the strength of soil will decrease. Keywords: swelling, activity number, soil improvement, ABSTRAKPerbaikan tanah (soil improvement) adalah salah satu metode perkuatan tanah. Salah satu metode soil improvement adalah penambahan tanah dengan kapur (CaO). Tanah yang bersifat swelling (mengembang bila basah dan mengerut bila kering) diidentifikasi dari nilai aktivitas tanahnya. Perilaku aktivitas tanah berkurang dengan bertambahnya CaO. Untuk tanah di daerah lapukan vulkanik (breksi vulkanik dan lava) seperti di Jatinangor, dengan nilai aktivitas tinggi, penambahan CaO yang optimum pada tanah mengembang adalah 15 % dan tidak lebih dari 20 %. Penambahan CaO yang berlebihan cenderung mengubah perilaku aktivitas tanah dan meningkatkan kembali angka aktivitas. Pada tanah lapukan batuan vulkanik (tuff) seperti di desa Cigintung, Kecamatan Malausma, di Kabupaten Majalengka, dengan aktivitas tanah sedang sampai tinggi, penambahan CaO cukup 15% sampai 20%. Lebih dari 20% CaO, maka angka aktivitas turun, namun kohesi akan turun pula sehingga kekuatan tanah justru akan berkurang. Kata kunci: swelling, angka aktivitas, perbaikan tanah

“SAVE WATER, SAVE JAKARTA” CAMPAIGN AS LAND SUBSIDENCE MITIGATION IN JAKARTA Jihadi, Luthfan Harisan; Ali, Abu Abdillah; Zakaria, Zufialdi; Anural, Muhammad Bey
Bulletin of Scientific Contribution Vol 12, No 1 (2014): Bulletin of Scientific Contribution
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24198/bsc.v12i1.8363

Jakarta, a very populated capital city of Indonesia, was built above alluvial deposit which is currently subsiding relative to sea level at a high rate. As a result Jakarta becomes more often to be flooded with water that delivered from other regions and also the sea level rises relative to land and shoreline move toward the ground are increasing feasibility of tidal flood to occur. Consolidation process of the ground acts as a cause to the land subsidence in Jakarta. The fact is water needs in Jakarta is high due to its high population. Therefore, large amount in withdrawal of groundwater occurs and causes the ground to settle. In order to decrease the rate of land subsidence, groundwater should be extracted in a proper, more effective and efficient way. Younger generation is advised to save water using a fresh approach which is easy to be understood and accepted. In the future, people in Jakarta will consider that saving water as a norm which brings great benefit to their environment, Jakarta.

Co-Authors abdullah, Fajar Abu Abdillah Ali, Abu Abdillah Adiwijaya, Annisa Ayungingtyas Pratiwi Adriansyah, Yan Agung Mulyo Agus Wiramsya Oscar Alam, Boy Yoseph Cahya Sunan Sakti Syah Alpionisa, Salsabila Nur Andriani, Tati Andriani, Tati APRILIAN, YOGA Arie Afriadi Asykarulloh, Abdul Wahid Aton Patonah, Aton Bakhtiar, Taufiq Basuki, Jodi Prakoso Bustomi, Zhafran Muhammad Asyam Chaniago, Aulia Eka P S Chen, Reynara Davin Dicky Muslim Emi Sukiyah Ersyari, Jodistriawan Euis Tintin Yuningsih Firmansyah, M. Nizar Hendarmawan Hendarmawan, Hendarmawan Heriwaseso, Anjar Imam Santosa Irvan Sophian Irvan Sophian, Irvan Ismawan Ismawan, Ismawan Iyan Haryanto, Iyan Jakah, Jakah Johanes Hutabarat Khoirullah, Nur Kristiawan, Yohandi Luthfan H. Jihadi, Luthfan H. Luthfan Harisan Jihadi, Luthfan Harisan MANIK, VITO ARISTO Mubarak, Aziez Muhammad Bey Anural, Muhammad Bey Muhammad Kurniawan Alfadli Mursito, Anggoro Nana Sulaksana NINGRUM, WIWIN JUNITA Pajrin, Ulfia Sari Pradnya Paramarta Raditya Rendra Putra, Rafino Kurnia Putri, Revena Denia Raden Irvan Sophian, Raden Irvan Rahmi, Nisa Shafira Muthia Ramsof, Rani Amalia Retnoningtyas, Widya Ika Rizky Narendra Utomo, Rizky Narendra Rukmana, Yanwar Yusup Sabila, Zahra Syahida Seraphine, Nadhirah Seru, Imanuel Seru, Imanuel Shafira, Nisa Siahaan, Yakub Sidarto Sidarto Sihotang, Josua Washington Sulastri, Murni Sumarnadi, Eko Sumaryono Sumaryono Taufiq, Mochamad Muslim Ulhaque, Thaha Rizal Wicaksana, Kintan Adelia Arum Wicaksono, Danny Wiguna, Purwa Yogi Prianda, Yogi Yohanes Tan, Yohanes Yuda, Himmes Fitra Yusi Firmansyah, Yusi Yusuf, Muhammad Farhan

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