In Alberta, Canada, the Standard Penetration Test (SPT) is commonly used to determine the soil parameters and characteristics at a specific site. The Cone Penetration Test (CPT) is also used to evaluate soil parameters, but it provides more detailed and accurate results compared to the SPT. There are several correlations between the SPT and CPT that can be used to estimate the soil parameters from CPT data. Here are a few examples:
Cone resistance (qc) and blow count (N): The cone resistance (qc) is a measure of the resistance of the soil to the cone during the CPT. It can be correlated to the blow count (N) from the SPT using published correlations such as the Robertson and Wride correlation.
Sleeve friction (fs) and friction ratio (f): The sleeve friction (fs) is a measure of the friction between the soil and the sleeve during the CPT. It can be correlated to the friction ratio (f) from the SPT using published correlations such as the Robertson and Wride correlation.
Soil classification: The SPT and CPT data can be used to classify the soil using the Unified Soil Classification System (USCS) or the Canadian System of Soil Classification (CSSC). The soil classification can be used to estimate the soil parameters such as the allowable bearing capacity and settlement.
Lateral earth pressure: The CPT data can be used to evaluate the lateral earth pressure on retaining walls. This can be done by using published correlations such as the Coulomb or Rankine method
It is important to note that these correlations are based on assumptions and may not be applicable to all soil conditions. It is always recommended to use the most accurate and reliable data available for geotechnical design.
At ZALIG, we offer a wide range of quality geotechnical, environmental, material testing, transport, survey and hydro-technical engineering services to clients in both the public and private sectors. Operating from our base in Western Canada, our industry-leading experts set the pace in various geotechnical, environmental, and construction service markets. If you need geotechnical engineering services in Alberta, we've got you covered! Get in touch with us today and let's talk about your project!