Geofoam is a geosintetik material made of Expanded Polystyrene (EPS) and Xtruded Polystyrene (XPS), which has a low weight property which makes
Vacuum preloading is an alternative method to improve water-saturated soft clay by accelerating the consolidation process. A trial using GVS system was done at Pantai Indah Kapuk residence, Jakarta to investigate the system reliability. Monitoring equipments used include settlement plate to measure the consolidation decrease, piezometer to measure pore water tension, inklinometer to identify the soil direction and lateral movement during the vacuum preloading process, and manometer to measure the vacuum pump pressure. Analytical calculations to estimate the consolidation decrease is done using one-dimensional consolidation theory of Terzaghi. Besides, a numerical analysis is performed by element method up to Plaxis software application. Meanwhile, the monitoring results are achieved using Asaoka theory that estimates the achieved degree of reduction and consolidation. The monitoring results and theoretical analysis indicate that the GVS system included in the vacuum preloading method is quite reliable as an alternative method of consolidation acceleration of water-saturated soft clay.
Besides opening new land to the hilly terrain, reclamation of beach and other watery land is one of the alternatives of residential land compliance which is pretty much applied. However, the reclamation work often encounteres some obstacles, such as the soft subgrade with a low carrying capacity and the possibility for consolidation reduction which is large and long and high sea waves that could potentially cause abrasion during both construction and after construction. The use of geosynthetic materials as an alternative material supporting the reclamation work in Indonesia is still limited. The project owner and executives tend to use conventional methods though the use of geosynthetic can provide benefits and ease of implementation. Some of the advantages of using geosynthetic materials in reclamation work with soft soil foundation is a faster execution of the work, loss reduction of embankment material into the soft subgrade, and lower maintenance costs. This paper discusses geosynthetic products as well as its application to the reclamation work that comes with examples of projects that have been or are being carried out and in Indonesia.
ABSTRAKProvinsi Jambi merupakan salah satu wilayah di Indonesia merupakan yang rawan bencana tanah longsor. Tanah longsor dapat dipicu oleh berbagai faktor, yaitu gempa, vegetasi dan iklim. Kenaikan muka air tanah menyebabkan tanah menjadi jenuh, sehingga kuat geser tanah berkurang. Analisis kestabilan lereng dibutuhkan untuk mengetahui faktor keamanan dari bidang longsor yang potensial. Analisis kestabilan menggunakan metode elemen hingga, sehingga pemodelan dapat dilakukan lebih kompleks mulai dari tahapan konstruksi hingga kenaikan muka air tanah. Pada saat melakukan analisis kestabilan lereng, kondisi lereng sebelum dan sesudah diberi perkuatan akan dikombinasikan dengan muka air tanah yang bervariasi, muka air tanah dinaikan sebesar 1 m dan 2 m dari kondisi awal. Hal ini bertujuan untuk mengetahui pengaruh fluktuasi muka air tanah terhadap kestabilan. Dari hasil analisis yang dilakukan pada lereng alami di proyek jalan kerinci sangaran agung, Provinsi Jambi, didapatkan nilai faktor keamanan 0,8779, hal ini menunjukkan lereng tersebut tidak stabil sehingga membutuhkan perkuatan. Kemudian dilakukan perkuatan lereng menggunakan terasering, bronjong, dan soil nailing. Dari hasil analisis faktor keamanan pada lereng yang sudah diberi perkuatan, bronjong dipilih sebagai metode pengendalian tanah longsor yang sesuai. Bronjong dipilih karena lebih stabil terhadap fluktuasi muka air tanah, hal ini dapat dilihat dari nilai faktor keamanan tetap diatas 1,5. Kemudian pada permukaan yang tidak diberi perkuatan, ditanami rumput vetiver untuk membantu pencegahan erosi pada tanah.Kata kunci: mitigasi, tanah longsor, faktor keamanan, muka air tanah, perkuatan Pada penelitian ini akan dibahas mengenai faktor-faktor penyebab kelongsoran tersebut, khususnya pengaruh dari iklim melalui modifikasi muka air tanah. Kemudian akan dilakukan mitigasi terhadap lereng tersebut dengan menggunakan metode terasering, bronjong, soil nailing dan rumput vetiver. Batasan MasalahDalam penelitian ini, batasan-batasan masalah yang digunakan sebagai berikut: 1.Analisis metode pengendalian kelongsoran tanah menggunakan terasering, bronjong, dan soil nailing. 2.Analisa ini dilakukan untuk proyek di Jambi. 3.Analisa menggunakan program elemen hingga. 4.Perhitungan dilakukan dengan mengabaikan beban dinamis. Gambar 6. Model Geometri BronjongSoil nailing didesain berdasarkan SNI 8460:2017 tentang persyaratan perancangan geoteknik. Dalam perhitungan digunakan parameter desain soil nailing sebagai berikut:
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