Evaluation of Prefabricated Vertical Drains (PVDS) Effectiveness in an Embankment Project : A Case Study of JLU Lamongan Section 1 Project

Putra, I Putu Wikanta (2025) Evaluation of Prefabricated Vertical Drains (PVDS) Effectiveness in an Embankment Project : A Case Study of JLU Lamongan Section 1 Project. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Pembangunan Seksi 1 proyek Jalan Lingkar Utara (JLU) Lamongan menghadapi tantangan geoteknik yang signifikan akibat keberadaan tanah lempung berlanau yang lunak dan mudah terkompresi. Untuk mengatasi permasalahan penurunan dan kestabilan tanah, metode perbaikan tanah berupa kombinasi Prefabricated Vertical Drains (PVD) dan pra-pembebanan timbunan diterapkan. Tugas akhir ini bertujuan untuk mengevaluasi efektivitas PVD yang telah dipasang melalui analisis desain teoritis dan kinerja lapangan. Studi ini mencakup tinjauan menyeluruh terhadap data sekunder, termasuk log bor, hasil uji laboratorium tanah, serta data pemantauan penurunan. Komponen desain meliputi geometri timbunan, prediksi penurunan tanah, dan estimasi waktu konsolidasi—baik dengan maupun tanpa PVD. Parameter penting seperti koefisien konsolidasi dan stratifikasi tanah ditentukan berdasarkan hasil SPT dan data laboratorium. Metode Asaoka digunakan untuk menginterpretasikan data penurunan di lapangan serta menghitung kembali derajat konsolidasi. Hasil analisis menunjukkan bahwa prediksi penurunan dan waktu yang dibutuhkan untuk mencapai 90% derajat konsolidasi umumnya sesuai dengan pengamatan di lapangan; meskipun demikian, terdapat beberapa perbedaan yang mengindikasikan kemungkinan pengaruh zona smear, kualitas instalasi, serta variasi sifat tanah. Secara keseluruhan, penggunaan PVD secara signifikan mempercepat proses konsolidasi dan meningkatkan kinerja timbunan. Studi ini tidak hanya menunjukkan manfaat praktis dari penggunaan PVD, tetapi juga memberikan rekomendasi untuk penyempurnaan metode desain pada proyek infrastruktur di atas tanah lunak di masa mendatang.
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The construction of Section 1 of the Jalan Lingkar Utara (JLU) Lamongan road project faces significant geotechnical challenges due to the presence of soft, compressible silty soil. To mitigate settlement and stability concerns, Prefabricated Vertical Drains (PVDs) in combination with embankment preloading were implemented as the chosen ground improvement method. This final project aims to evaluate the effectiveness of the PVDs installed in the project through a combination of theoretical design and field performance analysis. The study involves a comprehensive assessment of secondary data, including borehole logs, soil tests, and monitoring data, followed by the design of embankment geometry, soil settlement, and consolidation time—both with and without PVDs. Key parameters such as the coefficient of consolidation and soil stratification were derived from SPT results and laboratory data. The Asaoka method was used to interpret field settlement data and back-calculate the degree of consolidation. The results indicate that while the predicted settlements and time to reach 90% consolidation generally align with field observations, certain discrepancies suggest potential influences such as smear zones, installation quality, and soil variability. Overall, the implementation of PVDs significantly reduced the expected consolidation time and improved the performance of the embankment. This study not only evaluates the practical effectiveness of PVDs but also provides insights for improving future design methodologies for infrastructure projects built on soft ground.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	Asaoka method, consolidation, embankment, Lamongan, PVD, settlement, soil improvement
Subjects:	T Technology > TA Engineering (General). Civil engineering (General) > TA455.S6 Soil (Materials of engineering and construction) T Technology > TA Engineering (General). Civil engineering (General) > TA593.35 Instruments, cameras, etc. T Technology > TA Engineering (General). Civil engineering (General) > TA749 Soil stabilization
Divisions:	Faculty of Civil Engineering and Planning > Environment Engineering > 25201-(S1) Undergraduate Thesis
Depositing User:	I Putu Wikanta Putra
Date Deposited:	04 Aug 2025 06:45
Last Modified:	04 Aug 2025 06:45
URI:	http://repository.its.ac.id/id/eprint/124329

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