IDENTIFIKASI JENIS BATUAN BAWAH PERMUKAAN SEBAGAI KAJIAN AWAL PERENCANAAN PEMBUATAN PONDASI BANGUNAN MENGGUNAKAN METODE RESISTIVITAS

Hadi Imam Sutaji

Abstract


Underground investigations to identify the rock types have been done using resistivity method in Desa Tanjung, Saronggi. This was a preliminary study that can be used as a reference in planning the construction of building foundations. The identification was expected to reduce the failures in constructing building foundations in this area. To identify the underground rocks in the area, the measurements were done in open area at CV 1 area (±30,000 m^2) using Wenner-Schlumberger method. Data analysis was done using Res2Dinv. Results were 2D profiles consisting of length, depth and resistivity value of each line. Interpretations to contours obtained for each profile showed that there was hard soil with no clays within interval 70 Ωm – 100 Ωm, defined to be a gravelly sandy layer that has no clay and a coarse sandy gravelly layer (> 100 Ωm). Building foundations can be built in profile 1 using shallow building foundation construction at interval 15 m – 92 m and 118 m – 135 m, with depth being 2.5 m -15.5m. Such constructions can also be built in profile 2 and 3. In profile 2, the interval at which the constructions were possible lying between  25 m – 50 m, 108 m – 151 m and 159 m – 176 m, with their depths being  2.5 m – 20 m, 2.5 m – 12.8 m and  2.5 m – 8 m respectively. In profile 3, the construction can be built with depth interval 2.5 m – 15 m along length interval of 15 m – 135 m.

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