Advanced Testing
Cone Penetration Testing
STS is the only company in Pakistan that offers cone penetration testing (CPT). The CPT is a fundamental geotechnical investigation method that assesses soil properties in a non-destructive manner. The CPT provides a rapid, reliable and economical means of determining soil stratigraphy, relative density, strength information (static and dynamic pore pressure, hydraulic conductivity). STS’s skilled and knowledgeable operators can retrieve data at a faster rate even in difficult conditions, allowing less time on the job and a lower cost to the client.
With advanced equipment and precise data collection methods, our CPT services offer detailed insights into subsurface conditions. The results are analyzed and integrated into geotechnical models, contributing to informed decision-making and the successful execution of construction and infrastructure projects.
Pressure Meter Test
Pressure meter testing is an essential tool for assessing the small strain modulus of soils in both offshore and onshore geotechnical engineering.
Pressuremeter testing is an accurate in situ testing method for measuring a range of soil properties. Its prime use is in determining the in-situ strength and stiffness of soils and rocks.
Pressure meter (also referred to as High-Pressure Dilatometer (HPD testing) is used in a pre-bored pocket making the test relatively simple to perform in many ground conditions.
Electrical Resistivity Tomography
Resistivity surveys are used to characterize sub-surface materials in terms of their electrical properties. Variations in electrical resistivity, or conductivity, typically relate to changes in geology. Changes also occur due to the presence of water which can provide information on water saturation, fluid conductivity, porosity and permeability. Knowing these parameters allows for mapping of stratigraphic units, geological structures, sinkholes, fractures and groundwater profiles.
The survey equipment comprises of a string of electrodes at regular intervals which are connected to a central control box. Current is passed into the ground via a pair of electrodes and the accompanying array of electrodes detects return signals. Analysis of these currents enables electrode pairs to determine the apparent resistivity along the receiver line.
The recorded data is downloaded and analyzed to produce cross-sectional models of the ground, typically presented as color contour maps displaying the variation in resistivity. Interpretation of the data provides greater understanding of the sub-surface conditions and the data can be cross-referenced with other geophysical surveys or borehole profiles to provide calibration and confirmation of data analysis.
