Stressmeters
Soft Inclusion Stress Cells
The Model 4360 Vibrating Wire Soft Inclusion Stress Cells (SISC) are larger versions of the Model 4300 Borehole Stressmeters. The SISC is pre-loaded by wedging it into a large size diamond drill hole using an integral screw mechanism or hydraulic piston and can be set to measure both tensile and/or compression stress changes. It has been used successfully in 152 mm diameter overcoring holes (drilled to measure in situ stresses) to measure Aggregate/Alkali Reactions (AAR) in concrete dams.
| Specifications | |
|---|---|
| Standard Range¹ | ±35 MPa |
| Resolution¹ | 35 kPa |
| Accuracy² | ±0.5% F.S. |
| Temperature Range³ | −20°C to +80°C |
| Borehole Diameter³ | NX, PQ, HQ, 152 mm |
¹Proportional to rock modulus; figures given are for E = 0.03 × 10^6 MPa.
²Established under laboratory conditions.
³Other ranges and diameters available on request.