ANALISIS PENGGUNAAN PREFABRICATED VERTICAL DRAINS (PVD) PADA TANAH LEMPUNG LUNAK YANG TERDAPAT LAPISAN LENSA
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Abstract
Problem that often occurs in soft cohesive soils is settlement caused by consolidation process. If construction activities doing when the soils has not been consolidated, settlement can occur. To accelerate the consolidation process, soil improvement are usually do, one method of soil improvement to accelarate the consolidation process is vertical drain using prefabricated vertical drains (PVD). The soft soil layers in the field are not always continuous, sometimes found soft soil layers that have a lens layer. In this study, will discuss about the settlement and consolidation time of soft soil layers that have a lens layer which has been improved by PVD with 1 meter distance. Infrastructure that stand on a location that is installed by PVD is taxiway and loading by Airbus A380 aircraft of 18,22ton/m2. Analysis using the 1 dimensional consolidation theory of Terzaghi. For PVD installation to a depth of 50 meters, preloading settlement of 234,80 cm with a consolidation time of 2260 days for the square pattern PVD and 1918 days for triangle pattern PVD. Post loading settlement for PVD installation depth of 50 meters by 2,50 cm.
Abstrak
Masalah yang sering terjadi pada tanah kohesif dan lunak adalah penurunan yang disebabkan proses konsolidasi. Penurunan dapat menyebabkan keretakan pada struktur konstruksi yang berada di atasnya. Jika suatu kegiatan konstruksi dilakukan saat tanah belum terkonsolidasi, maka konstruksi tersebut dapat mengalami penurunan.. Untuk mempercepat proses konsolidasi biasanya dilakukan perbaikan tanah, salah satu metode perbaikan tanah untuk mempercepat proses konsolidasi yaitu vertical drain dengan menggunakan prefabricated vertical drains (PVD). Lapisan tanah lunak yang terdapat di lapangan tidak selalu kontinu, terkadang ditemukan lapisan tanah lunak yang terdapat lapisan lensa. Pada penelitian ini, penulis akan membahas mengenai waktu konsolidasi yang dibutuhkan oleh lapisan tanah kohesif dan lunak yang terdapat lapisan lensa yang telah diperbaiki dengan menggunakan PVD berjarak 1 meter. Infrastruktur yang berdiri di atas lokasi yang dipasang PVD berupa taxiway dengan beban berupa pesawat Airbus A380 sebesar 18,22 ton/m2. Analisis dilakukan menggunakan teori konsolidasi 1 dimensi Terzaghi. Untuk pemasangan PVD hingga kedalaman 50 meter diperoleh penurunan pra pembebanan sebesar 234,80 cm dengan waktu konsolidasi selama 2260 hari untuk pemasangan PVD pola persegi dan selama 1918 hari untuk pola segitiga . Penurunan pasca pembebanan untuk pemasangan PVD hingga kedalaman 50 meter sebesar 2,5 cm.
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References
Airbus S.A.S. Customer Service Technical Data Support and Services, A380 Aircraft Characteristics Airport and Maintenance Planning. Airbus S.A.S., 2005.
Aspar, Wimpie, A. N., dan Eka N. Fitriani, “Pengaruh Jarak dan Pola Prefabricated Vertical Drain (PVD) Pada Perbaikan Tanah Lempung Lunak”. Makalah Ilmiah Pengkajian Industri, vol. 10, no. 1, 2016, pp. 41-50.
Baron., R. A. “Consolidation of Fined-grained Soils by Drain Wells”. Transactions of the American Society of Civil Engineers, vol. 113, no. 1, 1948, pp. 718-742.
Cai, A. S. Balasubramaniam H., Zhu, D., Surarak, C., dan Oh, E. Y. N. “Settlements of Embankments In Soft Soils”. Geothecnical Engineering Journal of SEAGS & AGSSEA, vol. 41, no. 2, 2010, pp. 1-19.
Vertical Drains. 25 Agustus 2019: cofra.com/solutions/consolidation/vertical-drains.html.
Das, Braja M. Mekanika Tanah (Prinsip-prinsip Rekayasa Geoteknis). ed 2, Jakarta: Erlangga, 1995.
Hansbo, S. “Consolidation of Clay by Band-Shaped Prefabricated Drains”. Ground Engineering, vol. 12, no. 5, 1979, pp. 16-27.
Hansbo, S. “Consolidation of Fine-graned Soils by Prefabricated Drains”, Proceedings of 10th International Conference on Soil Mechanics and Foundation Engineering, Stockholm, vol. 3, 1981, pp. 677-682.
Hausmann, Manfred R., Engineering Principles of Ground Modification. McGraw-Hill, 1990.
Holtz, R. D., et al, Laboratory Testing of Prefabricated “Wick” Drains. Butterworth Heinemann, 1991
Long, Richard. P., dan Alvaro Covo. “Equivalent Diameter of Vertical Drains with an Oblong Cross Section.” Journal of Geotechnical Engineering, vol. 120, no. 9, 1994, pp. 1625–1630.
Shen, Shui-Long., et al. “Analysis of Field Performance of Embankments on Soft Clay Deposit with and without PVD-Improvement”. Geotextiles and Geomembranes, vol. 23, no. 6, 2005, pp. 463–485.
Badan Standarisasi Nasional. SNI 8460:2017, Persyaratan Perancangan Geoteknik. Jakarta: Badan Standardisasi Nasional, 2017.
Terzaghi, Karl. dan Peck, Ralph B. Mekanika Tanah Dalam Praktek Rekayasa. Ed 2, Jakarta: Erlangga, 1967.
Walker, Rohan., dan Buddhima Indraratna. “Vertical Drain Consolidation with Parabolic Distribution of Permeability in Smear Zone”. Journal of Geotechnical and Geoenvironmental Engineering, vol. 132, no. 7, 2006, pp. 937–941.