Combined ERT and borehole logs for mapping the soil-rock interface in a granitic environment

This study used the efficiency of electrical resistivity tomography (ERT) and borehole logs to map soil-rock interface beneath four traverses (RS1, RS2, RS3, RS4) in granitic terrain Perak, Peninsular Malaysia. The aimed evaluate impacts characteristic features interfaces on groundwater infrastructure development meet needs increasing inhabitants yearly. borehole- ERT-derived lithologic units are strongly correlated. delineated include topsoil, weathered (medium stiff hard silty clay or clayey silt with <800 Ωm), thin wide-sized weathered/fractured units, fresh bedrock. These profiles apertures support sustainable developments drill depths above 45 m. In contrast, clay/silt alternating stiffer soils, low load-bearing deep-weathered/fractured zones, bedrock boulders most places, except traverse have high affinities for water retention differential stresses. can adversely impact poorly reinforced foundations. Hence, structural elements foundations, such as footings piles, should be placed stable bedrock, particularly central western parts area. has reduced paucity information using ERT studies