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STABILISASI TANAH CAMPURAN VOLCANIC ASH TERHADAP NILAI KUAT GESER PADA TANAH QUARRY MEUNASAH RAYEUK KAWAY XVI ACEH BARAT Reza Mulia; Munirwansyah; Devi Sundary
Construction and Material Journal Vol. 5 No. 1 (2023): Construction and Material Journal Vol. 5 No. 1 Maret 2023
Publisher : Politeknik Negeri Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32722/cmj.v5i1.5528

Abstract

A clay-silty located in the quarry Meunasah Rayeuk, Kaway XVI, West Aceh is a source of stockpile material that is often used as road construction material in West Aceh. Based on the color this land is divided into three, namely red, yellow, and gray soil. These three types of soil have bad properties that make them unfit for use as road base layers. Therefore, it is necessary to stabilize it with a mixture of volcanic ash taken from Wih Pesam, Bener Meriah. The purpose of this study was to determine the effect of mixing soil with volcanic ash on the shear strength of the soil. This research method was carried out in the form of standard compaction tests, and direct shear strength on mixed volcanic ash soils. Variations in the addition of volcanic ash are 12.5%, 15%, 17.5%, and 20% of the dry weight of the soil. The research results show that these types of soil belonged to the A-7-6 of soil classification according to AASHTO identified as containing montmorillonite minerals in gray soil. The addition of volcanic ash to the three types of soil can increase the value of the shear strength of the original conditions at certain variations. The results of shear strength values ​​for volcanic ash mixture variations of 0%, 12.5%, 15%, 17.5% and 20%, were 0,8, 1,0, 0,8, 1,0, and 0,7 in units of kg/cm2 for red soil respectively. In the yellow soil of 1,0, 1,0, 0,9, 1,2, and 0,9 in units of kg/cm2. On gray soil as much as 0,7, 1,1, 1,0, 0,9, and 1,1 in units of kg/cm2.
TENSILE UPLIFT CAPACITY AND FAILURE MECHANISMS OF SCREW-PILE ANCHORS IN CLAY SOIL UNDER REPEATED LOADING Munirwansyah
Multidisciplinary Indonesian Center Journal (MICJO) Vol. 2 No. 4 (2025): Vol. 2 No. 4 Edisi Oktober 2025
Publisher : PT. Jurnal Center Indonesia Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62567/micjo.v2i4.2252

Abstract

This study investigates the tensile uplift capacity of screw piles in clay soil as an alternative anchoring system for slope stabilization in cohesive ground conditions. The research aims to address the limited availability of empirical field data on screw-pile behavior under repeated loading and to evaluate the agreement between theoretical predictions and actual in situ responses. The methodology employs an experimental approach through in situ testing with screw-pile diameters of 10 cm, 15 cm, and 20 cm, and embedment depths ranging from 0.6 m to 1.0 m. The tests were conducted under both static and repeated tensile loading using a hydraulic jack system, accompanied by vertical deformation measurements to establish load–displacement curves. Theoretical capacity was calculated using a limit equilibrium approach for comparison with experimental results. The findings reveal a nonlinear load–displacement response, characterized by initial stiffness followed by progressive deformation into the post-yield stage. At a maximum load of 2.858 tons, deformation increased with diameter, from 5.10 cm (10 cm) to 8.49 cm (20 cm). Under repeated loading, failure occurred at a lower load of approximately 1.6 tons with a maximum deformation of 1.648 cm, indicating potential capacity degradation due to cyclic loading. The comparison between theoretical and field results shows significant deviations, with analytical predictions generally underestimating the in situ capacity. This highlights the limitations of simplified models that do not fully account for shaft adhesion, installation disturbance, soil heterogeneity, pore-water pressure effects, and cyclic degradation. Overall, this study contributes valuable field pull-out test data for screw piles in clay under repeated loading, emphasizing the need for design calibration based on full-scale testing for slope stabilization applications. The results also suggest opportunities for further research involving long-term monitoring and advanced modeling of cyclic degradation.