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All Journal Jurnal Pensil : Pendidikan Teknik Sipil Jurnal Teknik Sipil dan Teknologi Konstruksi
Zakiyyah, Amirah
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Civil Engineering, Building, Construction & Architecture Education Engineering Industrial & Manufacturing Engineering Mechanical Engineering Transportation Other

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EVALUATION OF SLOPE STABILITY PROBLEMS: A CASE STUDY OF SLOPE REINFORCEMENT ON EXPANSIVE SOIL FOR THE HIGH-VOLTAGE TRANSMISSION TOWER (SUTT) T80 MALINGPING–BAYAH, SUKABUMI Wintoro, Bayu; Hakim, Abi Maulana; Kamil, Aozora Insan; Zakiyyah, Amirah
Jurnal Pensil : Pendidikan Teknik Sipil Vol. 14 No. 3 (2025): Jurnal Pensil : Pendidikan Teknik Sipil
Publisher : LPPM Universitas Negeri Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21009/jpensil.v14i3.54672

Abstract

Expansive soils are highly susceptible to volumetric changes due to moisture fluctuations, which can significantly affect the stability and durability of structures. Therefore, their presence must be carefully considered during the planning and foundation design stages. Survey, field investigations, and lab tests show that soil up to 8 m deep has a plasticity index of 30%–65%. Swelling tests on samples from 1 m–3.5 m depths revealed swelling percentages of 0.545%–0.715% and pressures of 11.7 kPa–12.5 kPa, which are high for near-surface soil. XRD tests identified montmorillonite minerals, known for high activity and shrinkage, contributing to slope cracks and movement. Geotechnical analysis using finite element method shows that slope stability safety factors of 0.84 (static) and 0.62 (earthquake), below required thresholds of 1.5 and 1.1, respectively. The proposed reinforcement includes double-row soldier piles, connected by a capping beam. The slope surface will be graded downstream and reinforced with 1 m thick stone masonry. These measures are expected to increase safety factors to 1.72 (static) and 1.1 (earthquake), meeting safety standards.
Efektifitas Gelagar Pci Girder Bentang 40 Meter Jembatan Integral Multispan Pilar Tinggi Akhbar, Try Kurniawan; Zakiyyah, Amirah; Puspitasari, Ira; Nurdin, Muhammad Irfan
Jurnal Teknik Sipil dan Teknologi Konstruksi Vol 11, No 2 (2025): JURNAL TEKNIK SIPIL DAN TEKNOLOGI KONSTRUKSI
Publisher : Universitas Teuku Umar

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35308/jts-utu.v11i2.13639

Abstract

 Integral bridges are a type of bridge designed without the use of expansion joints or dilation gaps, allowing the superstructure and substructure to act monolithically without relative movement. In Indonesia, the application of integral bridge concepts is limited. Generally, bridges in the country are designed using simple-span systems with conventional bearings, which, despite their straightforward construction, require periodic maintenance and replacement. Precast prestressed concrete (PCI) girders have been implemented in several integral bridge designs in Indonesia; however, their application is restricted, particularly for piers of considerable size or height. This study aims to determine the maximum pier height applicable for multispan integral bridges utilizing PCI girders commonly available in the market. The investigation focuses on girders with a span length of 40 meters, given their widespread use in Indonesia. Structural modeling was carried out for pier heights ranging from 30 to 60 meters, considering structural behavior during both construction stages and service conditions. The results indicate that for a pier height of 30 meters, the stresses in the PCI girder remain within permissible limits. However, when the pier height increases to 40 meters, the stress exceeded allowable thresholds. Therefore, the use of standard PCI girders with a 40-meter span under such conditions is not recommended unless supported by design modifications or advanced construction technologies. It is thus concluded that 40-meter PCI girders are effective for integral bridge applications with pier heights below 30 meters.
Co-Authors Akhbar, Try Kurniawan Hakim, Abi Maulana Ira Puspitasari Kamil, Aozora Insan Nurdin, Muhammad Irfan Wintoro, Bayu