Design of Core of Earthen Dam by Replacement with Geosynthetics

Mohammed, Asif Ali; Mouli, S. Sasanka; Bhushan, J. Y. V. Shiva

doi:10.1007/978-981-16-5601-9_7

Cited by 2 publications

(2 citation statements)

References 5 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Pada desain alternatif yang memenuhi syarat ijin pada sub bab sebelumnya yaitu desain B (2/3 ketebalan inti eksisting), terdapat peningkatan volume zona random tanah sebanyak 108.429,72 m 3 tetapi terdapat pengurangan volume zona inti lempung sebanyak 148.995,71 m 3 . Volume zona inti lempung berkurang sebanyak 34%, masih lebih banyak daripada pemakaian Geosynthetic Clay Liner yang hanya mengurangi volume inti hingga 13% (Mohammed, 2021) Jurnal Teknik Hidraulik Vol. 14 No.2, November, 2023 : 105 -118 118 KESIMPULAN Berdasarkan hasil analisis yang sudah dilakukan pada bab sebelumnya, maka dapat diambil kesimpulan bahwa analisis stabilitas pada perencanaan desain awal sudah memenuhi syarat minimum dengan nilai SF yang paling kritis 2,228 pada bagian hilir kondisi muka air banjir.…”

Section: Perhitungan Volume Materialsunclassified

Alternatif Perencanaan Inti Tubuh Bendungan Semantok Menggunakan Geomembran

Lastiasih,

Widodo,

Endah

2023

JTH

View full text Add to dashboard Cite

The Semantok Dam, located in Rejoso District, Nganjuk Regency, has a total length of 3,005 m and a height of 26 m with a zonal type of fill. The dam body uses 5 types of natural materials as its constituent parts, namely lempung as the core, sand as a fine filter, gravel as a coarse filter, random soil as the dominant material, riprap and rocktoe materials as surface layers. The core material of the dam is lempung which meets the requirements to overcome seepage problems in the dam body. However, the volume of lempung material required is very large with high compaction. Therefore, it is necessary to plan alternative uses of replacement materials in the form of impermeable geosynthetics to reduce the thickness of the dam core. In planning, stability and seepage requirements must still be met. To carry out an analysis of the combined use of geomembran HDPE 2 mm in various variations in the thickness of the core zone, the Geo-Studio auxiliary program was used, where the Seep/W program was used to determine seepage and phreatic lines in the dam body, while the Lereng/W program was used to check the stability of the dam body. From several dam core thicknesses analyzed, the use of 2 mm HDPE geomembran material combined with 2/3 of the thickness of the existing core zone provides results that meet the requirements for seepage and dam stability. To overcome seepage under the dam body, secant piles are installed under the dam. The effect of earthquake loads was also analyzed where the dam remained safe for OBE earthquake loads of 100 years and 145 years; at an MDE of 10,000, the dam will experience minimum damage which still meets the requirements of 50% of the safety height with a deformation or diversion value of 15.36 cm.Keywords: Semantok Dam, weir core, geomembran, stability, seepage ABSTRAKBendungan Semantok yang terletak di Kecamatan Rejoso Kabupaten Nganjuk memiliki panjang total mercu bendungan 3.005 m dan tinggi tubuh bendung 26 m dengan jenis urukan tipe zonal. Tubuh bendungan menggunakan 5 jenis material alam sebagai penyusunnya yaitu lempung sebagai inti, pasir sebagai filter halus, kerikil sebagai filter kasar, random tanah sebagai material dominan, serta material riprap dan rocktoe sebagai lapisan permukaan. Material inti bendungan adalah tanah lempung yang memenuhi syarat untuk mengatasi masalah rembesan di tubuh bendungan. Hanya saja, volume material lempung yang dibutuhkan sangat banyak dengan pemadatan yang tinggi. Oleh sebab itu, perlu direncanakan alternatif pemakaian material pengganti berupa geosintetik yang kedap untuk mengurangi ketebalan inti bendungan. Dalam perencanaannya, persyaratan stabilitas dan rembesan harus tetap dipenuhi. Untuk melakukan analisis terhadap kombinasi penggunaan geomembran HDPE 2 mm pada berbagai variasi ketebalan zona inti, digunakan program bantu Geo-Studio dimana program Seep/W untuk mengetahui rembesan dan garis freatik dalam tubuh bendungan, sedang program Lereng/W untuk cek stabilitas tubuh bendungannya. Dari beberapa ketebalan inti bendungan yang dianalisis, penggunaan material geomembran HDPE 2 mm yang dikombinasi dengan 2/3 ketebalan zona inti eksisting memberikan hasil yang memenuhi syarat rembesan dan stabilitas bendungan. Untuk mengatasi rembesan di bawah tubuh bendungan, secant pile dipasang di bawah bendungan. Pengaruh beban gempa juga dianalisis dimana bendungan tetap aman untuk beban gempa OBE 100 tahun dan 145 tahun; pada MDE 10.000, bendungan akan mengalami kerusakan minimum yang masih memenuhi syarat 50% tinggi jagaan dengan nilai deformasi atau alihan sebesar 15,36 cm.Kata Kunci: Bendungan Semantok, inti bendung, geomembran, stabilitas, rembesan

show abstract

Section: Perhitungan Volume Materialsunclassified

Alternatif Perencanaan Inti Tubuh Bendungan Semantok Menggunakan Geomembran

Lastiasih,

Widodo,

Endah

2023

JTH

View full text Add to dashboard Cite

show abstract

“…Under critical conditions, the FOS for both the upstream and downstream slopes tends to sharply decline with thinning of the clay core (Khanna et al 2011). Under both static and transient conditions, the application of geosynthetic clay liner (GCL) can reduce clay core size and decrease seepage through embankment by 22% (Mohammed 2022). In the advancement of core construction, composite materials can be economically used to meet the strength requirement of earthen embankments.…”

Section: Introductionmentioning

confidence: 99%

Parametric Optimization of Bentonite-fly-ash Composite Core for Earthen Embankment using Taguchi Coupled Sunflower Optimization Algorithm

Subhadarsini

Giri

Das

2023

Preprint

View full text Add to dashboard Cite

A typical earthen embankment is a raised compacted wall-like structure basically consisting of an outer shell to permit seepage of minimum piping, a centrally located core, and a base drainage filter to check the flow of water through it. The earthen embankment needs a centrally stabilized clay core made off locally available puddle clay composite with coarse soil in order to store and divert storm water. In the current work, a compression moulding technique was used employed to build a low-cost composite for clay core using readily available bentonite reinforced with fly-ash. The experimental work initiated with the characterization of the locally collected soil, bentonite and fly-ash along with the micro structural investigation utilizing Scan Electron Microscopy (SEM) and Energy Dispersive X-Ray (EDX). Proctor test has been employed to stabilize clay core composite using different percentage ratios of bentonite and fly-ash according to the Taguchi L9 orthogonal array. The obtained maximum dry density (MDD) and optimum moisture content (OMC) were arranged in the design of the experiment (DOE) to examine the best possible results. The experimental findings from the Taguchi optimization approach determine the optimum values of OMC and MDD. The Analysis of variance (ANOVA) was performed to determine the primary factor influencing the strength of the clay core using signal-to-noise (S/N) ratio. A meta-heuristic method named as Sunflower optimization technique was employed to validate the generated optimum OMC and MDD. Verified OMC and MDD results were corroborated with the impervious core properties of the existing structures.

show abstract

Design of Core of Earthen Dam by Replacement with Geosynthetics

Cited by 2 publications

References 5 publications

Alternatif Perencanaan Inti Tubuh Bendungan Semantok Menggunakan Geomembran

Alternatif Perencanaan Inti Tubuh Bendungan Semantok Menggunakan Geomembran

Parametric Optimization of Bentonite-fly-ash Composite Core for Earthen Embankment using Taguchi Coupled Sunflower Optimization Algorithm

Contact Info

Product

Resources

About