Vane Shear Testing
The Electric Vane Shear Testing (EVST) system can be deployed with any drilling system, either on land or on water. In highly sensitive soils, the torque measurement can be positioned down hole almost immediately behind the vane, eliminating the effects of rod friction.
The EVST has a proven track record as an extremely accurate tool for measuring su, especially when compared to manually operated techniques. In very low strength soils where a high-quality measurement of in-situ peak and remoulded su is required the EVST provides a result less effected by operator error and data interpretation.
The EVST is excellent for profiling shear strength when used in combination with the CPT. Site specific correlations are frequently developed by carrying out adjacent CPTU soundings and EVST boreholes.