Analisa Stabilitas Lereng Kali Kedurus Kota Surabaya Pasca Normalisasi Terhadap Variasi Tinggi Muka Air

Maharani, Dewi (2026) Analisa Stabilitas Lereng Kali Kedurus Kota Surabaya Pasca Normalisasi Terhadap Variasi Tinggi Muka Air. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Kali Kedurus berperan penting dalam sistem drainase Kota Surabaya bagian barat. Normalisasi sungai untuk mengembalikan kapasitas pengaliran berpotensi mengubah geometri penampang sehingga memengaruhi stabilitas lereng tebing. Penelitian ini menganalisis pengaruh normalisasi terhadap kapasitas pengaliran sungai menggunakan simulasi HEC-RAS, nilai faktor keamanan (SF) lereng eksisting pasca normalisasi pada penampang kritis, serta nilai faktor keamanan terhadap kedalaman penetrasi (SF embedment) perkuatan Corrugated Concrete Sheet Pile (CCSP) pada penampang tersebut. Seluruh analisis ditinjau pada beberapa variasi tinggi muka air. Variasi tinggi muka air tersebut adalah kosong, Muka Air Banjir (MAB) dengan debit banjir Q25, dan Rapid Drawdown). Pengecekan SF dilakukan dengan menggunakan pemodelan 2D GeoStudio (SEEP/W dan SLOPE/W) untuk kondisi eksisting, dan metode Free Earth Support untuk perkuatan CCSP. Semua analisis geoteknik didasarkan pada data Bore Log dan Hasil Uji Laboratorium Tanah (Titik B1, Proyek Rumah Pompa Simpang Wiyung). Nilai SF kondisi eksisting pada penampang kritis diperoleh sebesar 1,038 (kosong), 1,279 (MAB), dan 0,429 (Rapid Drawdown), sehingga lereng dinyatakan tidak aman (SF<1,5) pada seluruh kondisi. Setelah perkuatan CCSP, nilai SF embedment pada penampang tersebut meningkat menjadi 5,298 (kosong), 6,538 (MAB), dan 2,965 (Rapid Drawdown), sehingga seluruh kondisi dinyatakan aman (SF$\ge$1,5). Hasil analisis menunjukkan normalisasi berhasil meningkatkan kapasitas pengaliran seluruh 24 penampang (STA K12–K35) sehingga mampu mengalirkan debit banjir Q25 sebesar 88,54 m³/dt tanpa limpasan.
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The Kedurus River plays an important role in the drainage system of western Surabaya City. River normalization to restore flow capacity has the potential to change the cross-sectional geometry, thereby affecting the stability of the riverbank slopes. This study analyzes the effect of normalization on the river's flow capacity using HEC-RAS simulation, the safety factor (SF) value of the existing slope after normalization at the critical cross-section, as well as the safety factor value against penetration depth (SF embedment) of Corrugated Concrete Sheet Pile (CCSP) reinforcement at that cross-section. All analyses were reviewed under several variations of water surface elevation. These water surface elevation variations are empty (dry condition), Flood Water Level (MAB) with a Q25 flood discharge, and Rapid Drawdown. SF checking was carried out using 2D GeoStudio modeling (SEEP/W and SLOPE/W) for the existing condition, and the Free Earth Support method for the CCSP reinforcement. All geotechnical analyses are based on Bore Log data and Soil Laboratory Test Results (Point B1, Simpang Wiyung Pump House Project). The SF values for the existing condition at the critical cross-section were obtained at 1.038 (empty), 1.279 (MAB), and 0.429 (Rapid Drawdown), so the slope is declared unsafe (SF<1.5) under all conditions. After CCSP reinforcement, the SF embedment values at that cross-section increased to 5.298 (empty), 6.538 (MAB), and 2.965 (Rapid Drawdown), so all conditions are declared safe (SF$\ge$1.5). The analysis results show that normalization successfully increased the flow capacity of all 24 cross-sections (STA K12–K35) so that they are able to convey the Q25 flood discharge of 88.54 m³/s without overflow.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	CCSP, GeoStudio, Kali Kedurus, Rapid Drawdown, Stabilitas Lereng. CCSP, GeoStudio, Kedurus River, Rapid Drawdown, Slope Stability.
Subjects:	T Technology > TA Engineering (General). Civil engineering (General) T Technology > TA Engineering (General). Civil engineering (General) > TA749 Soil stabilization T Technology > TA Engineering (General). Civil engineering (General) > TA760+ Retaining walls T Technology > TA Engineering (General). Civil engineering (General) > TA780.C29 Piling (Civil engineering)
Divisions:	Faculty of Vocational > 22301-Civil Infrastructure Engineering (D4)
Depositing User:	Dewi Maharani
Date Deposited:	04 Aug 2026 02:03
Last Modified:	04 Aug 2026 02:03
URI:	http://repository.its.ac.id/id/eprint/142672

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