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All Journal BENTANG : Jurnal Teoritis dan Terapan Bidang Rekayasa Sipil Indonesian Geotechnical Journal
Eddy Triyanto Sudjatmiko
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Civil Engineering, Building, Construction & Architecture Earth & Planetary Sciences Transportation

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Studi Penanganan Jalan Amblas di Desa Sumbernanas, Kecamatan Gedangan, Kabupaten Malang Eddy Triyanto Sudjatmiko; Henri Siswanto
Bentang : Jurnal Teoritis dan Terapan Bidang Rekayasa Sipil Vol 11 No 2 (2023): BENTANG Jurnal Teoritis dan Terapan Bidang Rekayasa Sipil (Juli 2023)
Publisher : Universitas Islam 45

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33558/bentang.v11i2.6920

Abstract

A landslide occurred in Sumbernanas village, Gedangan district, Malang regency. This incident caused the 50 m of the road along the Gedangan – Gondanglegi section to collapse as much as 3 m deep. Some repairs were attempted, however it did not bring expected results. This study aims to analyze the causes of the road collapse and develop effective methods of measurement. The research comprise; field observations, study of regional geological conditions, in-situ soil investigations, topographic measurements, data processing and analysis. Design parameters were determined through back-calculation analysis of the stability of the slopes at the time of the collapse. The results indicated that the collapse was caused by the combination of scouring of the river channel banks and soil softening as a result of groundwater infiltration. The proposed measurement method is installation of a gabion construction to function as a retaining wall. Based on structure calculations obtained, the safety factors are (SF)> 1,5 for the short term and SF> 1,1 for the long term.
Adhesion Factor (α) of Drilled Piles in Clay Shale with Static and Dynamic Load Eddy Triyanto Sudjatmiko; The Cin Hok
Indonesian Geotechnical Journal Vol. 5 No. 1 (2026): Vol. 5, No. 1, April 2026
Publisher : Himpunan Ahli Teknik Tanah Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56144/igj.v5i1.146

Abstract

Adhesion factor (α) is one of the significant parameters in calculating the bearing capacity of pile foundations, both for driven piles and bored piles in clay soils. In practice, the α value is usually estimated based on the available empirical correlations. The applicability of this correlation for bored pile installed in expansive soil and clay shale is questionable. Clay shale is known as one of the problematic soils, due to its physical properties that rapidly soften once exposed to water/moisture and loss of pressure. This physical sensitivity becomes crucial in bored pile constructions. Especially in the drilling and casting process as the soil is exposed to water and loss of horizontal pressure causing reduction in soil shear strength. This study investigates the load transfer behavior of a bored pile installed in clay shale formation. The pile, instrumented with vibrating wire strain gauges, was axially loaded through dynamic and static load test up to 700 tons. The strain gauges provide accurate strain measurement of each pile segment, proportional to the stress induced. Through the pile load-settlement, t-z and q-z curves, the load transfer mechanism and interaction between bored pile and the clay shale soil can be analyzed. By performing back analysis, the actual skin friction (fs), and adhesion factor (α), of bored piles in clay shale can be determined. The results show that in clay shale that have experienced slaking (30 < NSPT < 70), the adhesion factor (α) = 0.12~0.18. While for fresh clay shale (NSPT > 70), the adhesion factor (α) = 0.32~0.35. These values are significantly lower than α = 0.55 which is usually applied in practice; as well as some previous studies, including the value recommended by Reese and Wright (1979).
Co-Authors Henri Siswanto The Cin Hok