Evaluasi Shear Strength dan Stress History Tanah Lunak pada Pekerjaan Vacuum Preloading Menggunakan Uji CPTu
DOI:
https://doi.org/10.5614/jts.2023.30.3.7Keywords:
CPTu, evaluasi shear strength dan stress history, Jakarta marine clay, vacuum preloadingAbstract
Makalah berikut menyajikan evaluasi nilai shear strength dan stress history tanah lunak menggunakan CPTu. Lokasi penelitian berada di Kosambi Tangerang, pada tanah Jakarta marine clay. Pada area penelitian dilakukan pematangan lahan menggunakan prefabricated vertical drain (PVD) yang dikombinasikan dengan vacuum preloading sebesar 80 kPa. Dalam penelitian ini disebut metode konsolidasi vakum. Penelitian ini bertujuan untuk mengukur efektifitas pekerjaan konsolidasi metode vacuum preloading. Metode pengukuran efektivitas konsolidasi vakum menggunakan evaluasi nilai shear strength dan stress history dari CPTu. Hasil analisis dapat menunjukkan beban vacuum preloading yang diterima di setiap lapisan tanah. Besar derajat konsolidasi menggunakan analisis settlement plate tidak selalu mencerminkan besar peningkatan nilai kuat geser tanah. Nilai derajat konsolidasi tanah pada vacuum preloading lebih mendekati kondisi aktual jika menggunakan acuan peningkatan kuat geser tanah daripada hasil analisis settlement plate. Tanah Jakarta marine clay memiliki nilai ? berkisar 2.5 dan nilai Ch mendekatinilaiCv.
The following paper shows an evaluation of the shear strength and stress history values of soft soils using CPTu. The research location is in Kosambi, Tangerang, on Jakarta marine clay soil. In the research area, ground preparation was carried out using a prefabricated vertical drain (PVD) combined with a vacuum preloading of 80 kPa. In this study it is called vacuum consolidation method. This study aims to measure the effectiveness of consolidation using vacuum consolidation method by using the evaluation of shear strength values and stress history of CPTu. The results of the analysis can show the vacuum preloading load received in each soil layer. The result of consolidation degree using analysis of settlement plate does not always indicate the increase of shear strength in the soil. The value of degree consolidation on the vacuum preloading is closer to the actual condition when using the increasing shear strength compared to the result analysis from the settlement plate. Jakarta marine clay soil has an ? value of around 2.5 and the Ch value is close totheCvvalue.
References
Asaoka. A, 1978, Observational procedure of settlement prediction, Soils and Foundations, Vol. 18, No. 4, 87-10
Barron, R.A, 1948, Consolidation of FineGrained Soils by Drain Wells, Transactions of the American Society of Civil Engineers, Vol. 113: 718-724
CUR, 1996, Building in Soft Soils, AA Balkema. Rotterdam, Brookfield
Chu, J. and Yan, S.W, 2005, Application of the Vacuum Preloading Method in Soil Improvement Projects. Ground Improvement Case Histories, Elsevier Geo-Engineering Book Series
Desiani, A, 2017, Karateristik Tanah Lunak Cekungan Bandung Berdasarkan Uji In Situ, Disertasi, Universitas Katolik Parahyangan Bandung
Jie Han, 1964, Principles and Practices of Ground Improvement, Wiley
Karlsrud, K., Lunne, T. & Brattlieu, K, 1996, Improved CPTu correlations based on block samples, Nordisk Geoteknikermote, Reykjavik
Mcio de Souza S. Almeida, 2013, Design and Performance of Embankments on Very Soft Soils, CRC Press
Mesri, G., 1989, A Reevaluation of Su(mob) = 0.22 ??p Using Laboratory Shear Tests,? Canadian Geotechnical Journal, Vol. 26, No. l, pp. l62-164, 1989
Mitchell, J.K. and Gardner; W.S, 1975, In Situ Measurement of Volume Change Characteristics, Proceedings of the Conference on In-Situ Measurement of Soil Properties, Specialty Conf. of the Geotechnical Div., North Carolina State University, Raleigh, Vol. II, pp. 279-345
N.P. Lez-Acosta, 2019, Performance of a test embankment on very soft clayey soil improved with drain-to-drain vacuum preloading technology, Geotextiles and Geomembranes
Rahardjo, P. P, 1997, Pemodelan Konsolidasi dengan Vertikal Drain pada Lempung Lunak, Universitas Katolik Parahyangan
Rahardjo, P.P, 2016, CPTu in Consolidating Soils, Proceeding International Conference for Site Characterization? ISC 5th, Gold coast Australia.
Rahardjo, P. P, 2008, Penyelidikan Geoteknik dengan Uji-Insitu, Universitas Katolik Parahyangan
Rahardjo, P. P, 1996, Review of Soil Investigation for jakarta Reclamation Project, Intern Report, Unpublished
Rahardjo, P. P, 1998, Site Characterization for Reclamation Project in North Jakarta, Geotechnical Site Characterization ISBN 90 5410 939 4
Robertson, P.K, Cabal, K.L, 2014, Guide to Cone Penetration Testing for Geotechinal Engineering 6th Edition, Gregg Drilling & Testing, Inc. Signal hill, California
Rongsadi, Kirana, 2017, Evaluasi Performa/Perilaku Tanah Lunak Setelah Vacuum Preloading dengan Menggunakan CPTu, Thesis, Universitas Katolik Parahyangan Bandung
Schmertmann, 1978, Cone Penetration Test, US Department
Setiawan, Ricky, 2017, Interpretasi Uji CPTu pada Tanah Dasar dan Endapan Erupsi Lumpur di Sidoarjo, Jawa Timur, Thesis, Universitas Katolik Parahyangan Bandung
Setionegoro, Nurindahsih, 2013, Studi Karakterisasi Lapangan Lapisan Tanah Lempung Lunak Under-Consolidating Menggunakan Hasil Uji Piezocone, Disertasi, Universitas Katolik Parahyangan Bandung
Shuangxi Feng, 2021, Analysis of Ground Deformation Development and Settlement Prediction By Air-Boosted Vacuum Preloading, Journal of Rock Mechanics and Geotechnical Engineering
Yulianto, D, 2018, Kajian Performance Vacuum Preloading pada Tanah Lunak Endapan Danau (Lacustrine) di Bandung, Thesis, Universitas Katolik Parahyangan Bandung
