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All Journal Journal of Geoscience Engineering and Energy (JOGEE) Jurnal Ekonomi, Teknologi dan Bisnis
Fitra Yuda, Himmes
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Astronomy Civil Engineering, Building, Construction & Architecture Economics, Econometrics & Finance Education Energy Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering Physics

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GROUTING MERUPAKAN CARA PERBAIKAN YANG TEPAT PADA DASAR PONDASI RIVERBED BENDUNGAN SADAWARNA, SUBANG, JAWA BARAT: GROUTING IS THE RIGHT WAY TO REPAIR THE RIVERBED FOUNDATION OF THE SADAWARNA DAM, SUBANG, WEST JAVA Rachmayanti, Zarah; Ronoatmojo, Imam Setiaji; Fitra Yuda, Himmes
Journal of Geoscience Engineering and Energy VOLUME 6, NOMOR 1, FEBRUARI 2025
Publisher : Universitas Trisakti

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25105/jogee.v6i1.22157

Abstract

Dibangunan Bendungan, terdapat beberapa konstruksi yaitu main dam, riverbed, spillway, saddle dam dan masih banyak lagi. Dibagian riverbed yaitu fondasi bagian dari sungai atau aliran air yang tertahan di belakang bendungan. Dasar sungai juga berfungsi untuk menyalurkan air ketika air mengalir melalui spillway atau saluran pelepasan. Hal tersebut guna memenuhi persyaratan yang mengacu pada pedoman keamanan bendungan dari Kementerian PUPR. Evaluasi geologi teknik yang rinci perlu diberikan pada kondisi dasar fondasi, khususnya pada struktur saddle dam. Grouting menjadi salah satu teknik yang digunakan untuk memperbaiki dan meningkatkan efisiensi dasar fondasi guna memastikan keamanan dan stabilitas bangunan. Maka dari itu, fondasi bendungan wajib kedap air untuk mencegah rembesan atau kebocoran. Salah satu cara untuk mem perbaiki kerusakan yang disebabkan oleh deformasi struktur tanah atau batuan adalah dengan melakukan perbaikan fondasi dengan grouting. Pada umumnya kondisi tanah/batuan yang memiliki bidang diskontinuitas di bawah permukaan akibat kekar. Kondisi demikian akan menyebabkan nilai permeabilitas pada tanah /batuan tersebut menjadi tinggi. Hal ini akan menimbulkan kebocoran yang dapat mengakibatkan terjadinya kerusakan bendungan. Perbaikan yang perlu dilakukan  adalah dengan mengurangi rembesan air sehingga angka koefisien permeabilitas nya (nilai Lugeon) menjadi kecil. Untuk perbaikan fondasi tersebut dapat ditangani dengan menggunakan teknik injeksi semen (grouting) yang dilakukan pada bagian paling buruk kelas batuannya dan paling tinggi angka koefisien permeabilitasnya (nilai lugeon). In the dam building, there are several constructions, including main dam, riverbed, spillway, saddle dam and others. The riverbed section is the foundation of the part of the river or water flow that is blocked behind the dam. The riverbed also functions to channel water when the water flows through a spillway or release channel. This is to fulfill the requirements that refer to the dam safety guidelines from the Ministry of PUPR. A detailed engineering geological evaluation needs to be given to the basic condition of the foundation, especially the saddle dam structure. Grouting is one of the techniques used to repair and increase the efficiency of the foundation base to ensure the safety and stability of the dam. Therefore, the dam foundation must be watertight to prevent seepage or leaks. One way to repair damage caused by deformation of soil or rock structures is to repair the foundation with grouting. In general, soil/rock conditions have areas of discontinuity below the surface due to joints. Such conditions will cause the permeability value of the soil/rock to be high. This will cause leaks which can result in dam damage. Improvements that need to be made are to reduce water seepage so that the permeability coefficient (Lugeon value) becomes small. Foundation repairs can be handled using cement injection techniques (grouting) which are carried out on the parts with the worst rock class and the highest permeability coefficient (lugeon value).
ANALISIS GEOMORFOLOGI DAN POTENSI GEOWISATA DI RUMPIN, BOGOR, JAWA BARAT: GEOMORPHOLOGICAL ANALYSIS AND GEOTOURISM POTENTIAL IN RUMPIN, BOGOR, WEST JAVA Mubarak, Naufal Razan Al; Fitra Yuda, Himmes; Nuryana, Suherman Dwi
Journal of Geoscience Engineering and Energy VOLUME 6, NOMOR 1, FEBRUARI 2025
Publisher : Universitas Trisakti

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25105/jogee.v6i1.22239

Abstract

Daerah Rumpin, Jawa Barat, memiliki keanekaragaman geomorfologi, seperti perbukitan, lembah, sungai, dan batuan vulkanik hasil aktivitas gunung api masa lalu, menjadikannya potensial sebagai destinasi geowisata. Penelitian ini mengidentifikasi karakteristik geologi utama, meliputi geomorfologi, komposisi batuan (batupasir, batugamping, breksi, andesit), struktur geologi (lipatan dan sesar), serta mengevaluasi potensi geowisata menggunakan metode Kubalikova (2013), yang mencakup pengamatan lapangan, analisis laboratorium, dan evaluasi sumber daya mineral. Hasilnya menunjukkan lanskap Rumpin dipengaruhi oleh proses geologis kompleks, memiliki keindahan alam mendukung wisatawan, serta sumber daya mineral seperti andesit yang penting bagi ekonomi lokal. Tantangan utama adalah infrastruktur terbatas dan perlunya konservasi lingkungan. Berdasarkan pendekatan Kubalikova, rekomendasi difokuskan pada pengemba ngan geowisata berkelanjutan untuk meningkatkan ekonomi lokal sambil menjaga kelestarian alam, dengan mengintegrasikan aspek geologi dan pariwisata secara harmonis. The Rumpin area in West Java, Indonesia, features diverse geomorphological attractions, including hills, valleys, rivers, and volcanic rocks from past volcanic activity, making it a potential geotourism destination. This study identifies key geological characteristics, including geomorphology, rock composition (sandstone, limestone, breccia, and andesite), and geological structures (folds and faults), while evaluating geotourism potential using the Kubalikova (2013) methodology, which includes field observations, laboratory analysis, and mineral resource evaluation. The findings reveal that Rumpin's landscape, shaped by complex geological processes, offers natural beauty that supports tourism and mineral resources, such as andesite, which are vital to the local economy. Key challenges include limited infrastructure and the need for environmental conservation. Based on Kubalikova's approach, the recommendations focus on sustainable geotourism development to enhance the local economy while preserving the natural heritage by integrating geological and tourism aspects harmoniously.
Analysis Of Land Subsidence Relationship With Groundwater Table Depletion In South Jakarta Nembo, Andreas Julio; Anugrahadi, Afiat; Fitra Yuda, Himmes
Jurnal Ekonomi Teknologi dan Bisnis (JETBIS) Vol. 2 No. 2 (2023): Jurnal Ekonomi, Teknologi dan Bisnis
Publisher : Al-Makki Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.57185/jetbis.v2i2.33

Abstract

Increased development activities and urbanization in South Jakarta have increased groundwater extraction. Continuous withdrawal of groundwater with poor management can cause a decrease in the groundwater level and trigger a subsidence. Therefore, a study is needed regarding the relationship of land subsidence with the decrease in groundwater levels that occur in South Jakarta. This research was conducted using secondary data in the form of drill log data to determine subsurface lithology, land subsidence measurement data using the GPS geodetic method, and groundwater level data in monitoring wells in Jakarta. The results of the study show that surface sediment deposits are dominated by a layer of clay which is still unconsolidated and relatively thickened to the north with a thickness of more than 300 m. This condition shows that the sediment layers in Jakarta are still undergoing a compaction process so that naturally subsidence occurs in the soil surface. Subsidence in the land surface in South Jakarta has a fairly strong correlation with the decline in the groundwater level, which is equal to 0.504, which means it has a fairly strong degree of correlation of 50.4%.
Co-Authors Afiat Anugrahadi, Afiat Imam Setiaji Ronoatmojo Mubarak, Naufal Razan Al Nembo, Andreas Julio Rachmayanti, Zarah Suherman Dwi Nuryana