PENGARUH PEMANCANGAN FONDASI TIANG PADA TANAH LEMPUNG JENUH TERHADAP TEKANAN AIR PORI
DOI:
https://doi.org/10.24002/jts.v14i4.2004Keywords:
driving pile, saturated clay, pore water pressureAbstract
Abstract: Installation of driving pile foundation is causing excess pore water pressure on saturated clay. Experimental study of driving pile installation effect on clayey silt is conducted at laboratory scale through pore water pressure value observation. The pore water pressure value was read using pressure transducers and head-meters, which has been installed at different depth of the soil sample. The experiment was carried out on two different soil samples. Sample 1 requires 146 strokes to fully drive, and Sample 2 requires 50 strokes. The pore water pressure value was affected by pile penetration depth. The pore water pressure at the bottom of the sample is higher than pore water pressure at the top of the sample. Excess pore water pressure at the sample with more stroke numbers is greater than the sample with less stroke numbers. Pore water pressure change values at Sample 1 are 0,04 kg/cm2 at the top of the sample and 0,10 kg/cm2 at the bottom, while at Sample 2 are 0,02 kg/cm2 at the top of the sample and 0,06 kg/cm2 at the bottom.
Abstrak: Pemancangan fondasi tiang mengakibatkan perubahan tekanan air pori pada tanah lempung jenuh. Pengujian pengaruh pemancangan pada perubahan tekanan air pori dilakukan melalui studi eksperimental menggunakan tanah lanau lempungan di laboratorium, dengan pembacaan perubahan nilai tekanan air pori. Pembacaan tekanan air pori dilakukan dengan alat pressure transducer dan head-meter yang dipasang pada variasi kedalaman tanah. Pengujian dilakukan pada dua sampel tanah yang berbeda. Pada Sampel 1 dibutuhkan 146 kali pukulan hingga tiang mencapai kedalaman rencana, sedangkan pada Sampel 2 dibutuhkan 50 kali pukulan. Nilai tekanan air pori dipengaruhi oleh kedalaman penetrasi fondasi tiang pada saat pembacaan. Nilai perubahan tekanan air pori di bagian bawah lebih tinggi dibandingkan perubahan tekanan air pori yang terjadi di bagian atas. Perubahan tekanan air pori lebih besar terjadi pada sampel dengan jumlah pukulan yang lebih banyak. Pembacaan perubahan tekanan air pori pada Sampel 1 bagian atas sebesar 0,04 kg/cm2 sedangkan bagian bawah sebesar 0,10 kg/cm2, pada Sampel 2 bagian atas sebesar 0,02 kg/cm2 sedangkan bagian bawah sebesar 0,06 kg/cm2.
References
Bingjian, Z. (2011). “Study of The Pore Water Pressure Variation Rule in Saturated Soft Soil Caused by Prestressed Concrete Pile Penetration”. Electric Technology and Civil Engineering (ICETCE), 2011 International Conference. Lushan, China.
Chandra, S. dan Hossain, Md. I. (1993). “Prediction and Observation of Pore Pressure Due to Pile Driving”. International Conference on Case Histories in Geotechnical Engineering. Paper 46.
Coduto, D. P. (1994). Foundation Design Principles and Practices. Prentice Hall, Inc., New Jersey.
Das, B. M. (2011). Principles of Foundation Engineering, SI, seventh edition. Cengage Learning, Stamford.
Flaate, K. (1972). “Effects of Pile Driving in Clays”. Canadian Geotechnical Journal, Vol. 9, No. 81.
Hardiyatmo, H. C. (2010). Analisis dan Perancangan Fondasi bagian II. Gadjah Mada University Press, Yogyakarta.
Head, K. H. (1986). Manual of Soil Laboratory Testing Volume 3: Effective Stress Test. Pentech Press Limited, London.
Tomlinson, M. dan Woodward, J. (2014). Pile Design and Construction Practice Sixth Edition. CRC Press, Boca Raton.
Wang, W., Zai, J., dan Lu, T. (2007). “Dissipation Process of Excess Pore Water Pressure Caused by Static Pressed Pile in Soft Soil”. Soft Soil Engineering: Proceedings of The Fourth International Conference. Vancouver, Canada.
Wykeham Farance (2008). Instruction Manual for 30 WF6016/30-WF6032 Geodatalog Series 6000 and Datacomn Software, Published by Controls.
Ying, X., Tao, H., Mo, J. (2015). “Initial Excess Pore Water Pressure Distribution due to Pile Driving in a Slope”. Electronic Jouenal of Geotechnical Engineering. Vol. 20, 5969-5978.
