Geotechnical Site Investigations
Materials Investigations determine the suitability of naturally- occurring soil or rock that could be used as a construction material. The available quantities are calculated from field data gathered from testpits and quality tests are carried out on samples by an approved laboratory. Strip ratios are calculated as a final determinant of a potential borrow-pit. Distance from area of interest and transportation costs to this area are calculated in determining economic viability.
Laboratory Testing of field samples includes: Shear Strength, Grain Size Determinations, Atterberg Limits, Moisture Content, Density, Consolidation, Swell Potential, Compaction Tests (Proctor), California Bearing Ratio (CBR), Aggregates, Concrete and Asphalt.
Joint Surveys are carried out on exposed rock faces in excavations, road cuttings and underground mines with the Q-system of Barton to determine possible slope or wedge failures of the haningwall. A line survey is carried out along the rockface, using a measuring tape and brunton compass to gather all necessary data which is later input into Stereonet ver 3.01 pc program which then draws stereonets showing areas of wedge failure. Our main area of expertise is in the South African gold mining industry.
Exploration of natural resources such as coal, CBM (Coal-Bed-Methane) and petroleum deposits is done by means of borehole drilling and geophysical surveys . Data captured in this way reveals the presence, extent, quantity and quality of the natural resources. Soil/rock surveys are carried out to determine the engineering properties of these materials around the borehole drilling machines as well as along routes of existing or planned oil pipelines or telecommunications cables. The RQD (Rock Quality Designation) is an important parameter reflecting the strength of rock, and is calculated from solid borehole cores during logging. Subsurface probing methods include: Soil Borings (auger, pneumatic, diamond-bit), Piezometers, Groundwater/Gas Monitor Wells, Coal/CBM diamond drilling and Soil/Groundwater Probes.
Wellsite geological services are offered on a rotational basis for the drilling of all types of petroleum and natural gas wells all over the world.
Data logging for Airborne Magnetic Surveys was carried out at a remote ground station in Sicily on behalf of GeoSolutions and it's client for the Italian client. The data logger and sensor were set up 50m apart on a quiet part of the coast. Recordings were taken daily over a period of 30 days, ensuring constant communication and coordination with the survey aircraft and main ground station. The latter was situated some 150km away. The photographs below show the instrumentation used. The sensor had to be anchored down firmly to minimize the buffeting effect of the wind which causes erratic data capture. The data logger was sheltered at all times from possible rain.
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