Bendungan Bener berdiri di Formasi Kebobutak (Tmok) yang merupakan produk vulkanisme. Belum ada studi mengenai kerentanan lereng lokasi pembangunan bendungan hingga saat ini, sehingga mitigasi kerentanan lereng perlu dilakukan. Mitigasi kerentanan lereng dipelukan untuk mendapatkan langkah pencegahan terjadinya longsor terutama selama proses konstruksi. Dasar Penentuan zona kerentanan mengacu data yang diperoleh dari overlay peta geologi teknik, peta kemiringan lereng, dan peta situasi lokasi konstruksi. Data tersebut antara lain kualitas massa batuan, kemiringan lereng, Intervensi konstruksi (galian baru) dan eksistensi penutup lahan serta tingkat pelapukan yang kemudian diolah dengan metode Analytical Hierarchy Process (AHP). Hasil analisis menunjukan bahwa lokasi pembangunan Bendungan Bener terdiri dari empat zona kerentanan antara lain zona kerentanan lereng sangat rendah (5%), zona kerentanan lereng rendah (25%), zona kerentanan lereng sedang (50%), dan zona kerentanan lereng tinggi (20%) yang berada di sebelah barat dan timur bendungan inti. Bendungan Inti dan lokasi genangan dibangun di lokasi zona kerentanan sangat rendah hingga sedang, sehingga galian untuk bendungan inti tidak memerlukan penanganan khusus begitu juga lokasi genangan karena potensi sedimentasi dari pengaruh longsoran di sekitar bendungan kecil. Beberapa lokasi konstruksi seperti jalan akses yang melewati lokasi dengan kerentanan lereng tinggi memerlukan penanganan segera seperti dengan shortcrete.
Abstract. Water flowing in the river causes a scouring event that occurs at the bed channel. The existence of scouring will increase along with changes in the geometry of the river and obstacles such as the weir which are followed by local scouring around the weir. Local scouring often occurs downstream end of weir sill which weakens its construction. Scouring measurement was conducted to monitor the pattern of scouring that occurs. By using Surfer software, the scouring visualization through the Data Grid and 3D Surface can be seen. In this research, scour monitoring in the laboratory using open channels (flume) and MDO weir with fine aggregate material as the basis of the channel. The retrieval of scouring data was performed after installing fine aggregate and three times variations of flow discharge, then the data were processed using Surfer. The first flow used water level +3.50 with the material carried at 3.77%. The second flow used water level +4.50 with the material carried at 11.16%. The third flow used water level +5.70 with the material carried at 25.46%. So with the continuous method, the total material carried at 36.27% is equivalent to 12575.77 cm3.
The land use change in a watershed cause erosion resulting in sedimentation in river channels. Physically treatment of sedimentation requires a considerable cost, hence it is necessary to find another alternative treatment, i.e. by utilizing river sediment for building materials. Brick is a building material that is widely produced and used by the society. To provide solutions for sediment reduction, it is necessary to do a research on the utilization of river sediment for brick raw materials. In this study, the utilization of sediment into bricks was proposed in the form of Unfired Bricks. Raw sediment material will be mixed with cement and sand with a certain composition to increase the compression strength of brick in order to meet one of the SNI requirements, i.e. 15-2094-2000 or SNI 03-0349-1989. Results found that the addition of cement and sand treatment can increase the compressive strength of the brick up to 44,176 kg/cm² at the age of 14 days. However, the compression strength test results are still below the compression strength of Red Brick requirements in accordance with SNI 15-2094-2000 where the minimum compression strength of brick is 50 kg /cm², but it qualify for the compression Strength Concrete Brick SNI 03-0349-1989 for the quality level of grade III with a minimum of 40 kg / cm² and grade IV with a minimum of 25 kg / cm²
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.
hi@scite.ai
10624 S. Eastern Ave., Ste. A-614
Henderson, NV 89052, USA
Copyright © 2024 scite LLC. All rights reserved.
Made with 💙 for researchers
Part of the Research Solutions Family.