Data for novel subsurface slopes hazardous mapping with engineering geologic and geophysical characterizations
Description
the research work applied the capability of engineering geological evaluation of the subsurface lithologic units to map the hazardous materials within the study area, with the integrated borehole characterizations. The electrical resistivity method deployed for the study is faster and cost effective. The study is significant to the discontinuation, and prevention, of potential environmental hazards and threats, to human lives, the ecosystem, and infrastructural facilities around the study sites, owing to the higher hazardous slopes’ ratings recorded. Slope mass ratings (SMR), and Rock Quality Designation (RQD), were carried out, which help with the construction of suitability, and slope assessment system (SAS) model ratings map of the study area. Generally, the mapped study area consisted of approximately 18.96 acres of land, i.e., (26.78%), of recorded slopes up to 5°. About 2.84 acres, i.e., (4.01%), of the study area has recorded slope of between 5° – 15°. Moderate slope gradient of between > 15° and 25° which covered about 2.23 acres, e.g., (3.16%). For slope gradient > 25° – 35°, it covered approximately 20.81 acres, e.g., (29.40%), whereas slope gradient > 35° - 60° covered about 17.78 acres, e.g., (25.12%). For recorded slope gradient > 60°, it covered about 8.16 acres, i.e., (11.53%).
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Electrical resistivity survey was conducted on 18 geoelectrical survey lines across the slope profile of the region that covered the Sultan Mahmud Power Station, Terengganu, Peninsular Malaysia. The initial electrode position was marked as point A, and the last electrode position was marked as point B. The center electrode was marked as point C, with the survey lines adequately align during the field data collection. Each of the ER survey line has a maximum of 200 m survey spread length with 5.0 m inter electrodes spacing. A total of 41 stainless steel metal electrodes were used by driving the electrodes to the ground with a hammer to give sufficient length and good contacts with the ground. A Global Positioning System (GPS) was used to record the coordinates and elevations of the electrodes position during the field data collection. To carry out various soils classification tests, enough soils samples were collected from each borehole well logs at the distress zones. A rotary drilling where the drill bit or casing shoe is spin at the base inside the well. Drilling fluids, e.g., water, was pumped down to the bit through the hollow drill rods, to lubricate the bit and flushes the drill debris up to the ground surface. The rock core samples were obtained from the rotary core drilling bit.