ANALISIS METODE KONSTRUKSI EMBANKMENT MENGGUNAKAN MATRAS BAMBU, HIGH STRENGHT GEOTEXTILE DAN REVETMENT

(Studi Kasus Toll Semarang – Demak Seksi 1b Zona N)

Abstrak

Pembangunan Jalan Tol Semarang–Demak yang terintegrasi dengan tanggul laut dibangun di atas tanah lunak dengan ketebalan besar, sehingga menimbulkan permasalahan geoteknik seperti rendahnya daya dukung tanah dan potensi ketidakstabilan timbunan. Untuk mengatasi kondisi tersebut, digunakan sistem perkuatan berupa Matras Bambu, High Strength Geotextille dan Revetment. Penelitian ini bertujuan untuk menganalisis pengaruh masing-masing metode perkuatan serta efektivitas kombinasi ketiganya terhadap stabilitas timbunan pada Jalan Tol Semarang–Demak Seksi 1B Zona N STA 4+425 sampai STA 4+600. Metode Penelitian yang digunakan adalah Analisis Numerik menggunakan Perangkat Lunak Plaxis 2D berdasarkan Data Hasil Penyelidikan Tanah dan parameter material perkuatan. Analisis dilakukan pada beberapa kondisi, yaitu tanpa perkuatan, penggunaan Bambu Matras dan Cerucuk Bambu, penambahan High Strength Geotextille, serta penambahan Revetment. Hasil analisis menunjukkan bahwa kondisi perkuatan Pancang Bambu dan Matras Bambu memiliki nilai Safety Factor = 1,391 (rawan runtuh), sedangkan kombinasi Bambu Matras dan Geotextile meningkatkan Safety Factor menjadi 1,785 (aman). Penerapan Revetment pada lereng menghasilkan Safety Factor = 1,629, yang menunjukkan stabilitas lereng terhadap Deformasi Lateral dan pengaruh kenaikan Muka Air Laut. Dengan demikian, kombinasi tiga Metode Perkuatan ini terbukti efektif secara teknis dalam meningkatkan kestabilan Embankment di area Tanah Sangat Lunak. Penelitian ini memberikan kontribusi terhadap pengembangan Metode Konstruksi Berkelanjutan dengan memadukan teknologi lokal dan modern untuk Proyek Infrastruktur berskala besar.

The construction of the Semarang–Demak Toll Road, which is integrated with a coastal dike, is built on thick soft soil deposits, resulting in geotechnical challenges such as low bearing capacity and potential embankment inStability. To overcome these conditions, a reinforcement system consisting of bamboo mattress, high-strength geotextile, and Revetment was applied. This study aims to analyze the influence of each reinforcement method and the effectiveness of combining three method in improving the embankment Stability of the Semarang–Demak Toll Road Section 1B, Zone N, from STA 4+425 to STA 4+600. The research method used is Numerical Analysis with Plaxis 2D Software based on Soil Investigation Data and reinforcement material parameters. The analysis was carried out under several conditions: without reinforcement, with bamboo mattress and bamboo piles, with additional high-strength geotextile, and with the addition of a Revetment. The analysis results show that the reinforcement using bamboo piles and bamboo mattress produced a Safety Factor of 1.391 (indicating potential failure), while the combination of bamboo mattress and geotextile increased the Safety Factor to 1.785 (Stable). The application of a Revetment on the slope yielded a Safety Factor of 1.629, indicating improved slope Stability against lateral deformation and the influence of sea level rise. Thus, the combination of these three reinforcement methods is proven to be technically effective in enhancing the Stability of embankments constructed on very soft soil. This study contributes to the development of suStainable construction methods by integrating local and modern technologies for large-scale infrastructure projects.