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PENYELIDIKAN WEAK ZONE MENGGUNAKAN METODE WELL LOGGING DIKECAMATAN MONTASIK DAN INGIN JAYA, ACEH BESAR AMSIR AMSIR; ZAKIA MASRURAH; NURUL AZMI; MUHAMMAD SYUKRI; CUT ZAHARA ROZA
Karst: Jurnal Pendidikan Fisika dan Terapannya Vol 6 No 2 (2023): Karst : Jurnal Pendidikan Fisika dan Terapannya
Publisher : Program Studi Pendidikan Fisika FKIP Universitas Muslim Maros

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.46918/karst.v6i2.2078

Abstract

Weak zone investigation using well logging method in Montasik and Ingin Jaya sub-districts, Aceh Besar has been conducted at ten borehole points. In this study, the well logging method was used to obtain and determine the presence of weak zones in ten boreholes in Aceh Besar District. The subsurface data obtained from this well logging method is in the form of cutting data, namely subsurface rock lithology and electrical logging data, namely resistivity log values. Based on the results of data analysis and interpretation, these ten boreholes have weak zones and the most significant ones are found at four borehole points, namely boreholes T1, T2, T5, and T10. Point T1 is located at a depth of 76 - 106 m, which is a clay layer with a resistivity value of 105 - 289 Ωm. Point T2 is at a depth of 45 - 57 m, which is a sand layer with a resistivity value of 32 - 38 Ωm. Point T5 is at a depth of 0 - 40 m, which is a clay layer with a resistivity value of 26 - 184 Ωm. Point T10 is at a depth of 60 - 62.5 m and 62.5 - 80 m, namely there are layers of sand and passive clay with resistivity values of 3 - 117 Ωm and 3 - 111 Ωm. keywords: Aceh Besar, resistivity value, Well Logging, Weak Zone
Analisis Litologi Bawah Permukaan Kawasan Longsor di Jalan Lintas Barat KM-25 dengan Resistivitas 2-Dimensi Amsir, Amsir; Meikel Suryanta Sembiring; Zakia Masrurah; Dian Darisma; Tomi Afrizal
INSOLOGI: Jurnal Sains dan Teknologi Vol. 4 No. 4 (2025): Agustus 2025
Publisher : Yayasan Literasi Sains Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55123/insologi.v4i4.6032

Abstract

This study aims to analyse the subsurface lithology in the landslide-prone area at KM-25 West Cross Road using a 2-dimensional resistivity method with a dipole-dipole configuration on two measurement tracks. The inversion results reveal significant lithological heterogeneity, with a low resistivity zone (<50 Ωm) at a depth of 5-20 metres, interpreted as a water-saturated clay layer or weathered material. The physical properties of this layer contribute to increased pore pressure, potentially forming a slip plane. The transition zone between the saturated clay layer and hard rock with high resistivity (>100 Ωm) is identified as a geomechanically weak zone prone to ground movement, primarily when saturation occurs due to heavy rainfall. The resistivity cross-section of the second pass shows similar features, with a thicker and wider zone of very low resistivity (<30 Ωm), indicating the presence of soft clays or unconsolidated fill. These results emphasise the importance of early detection of subsurface resistivity contrasts as indicators of landslide potential. This research provides an essential contribution to disaster mitigation efforts and can serve as a basis for spatial planning and infrastructure design to enhance resilience against geological hazards.