IS 7317:1993 is the Indian Standard (BIS) for uniaxial jacking test for deformation modulus of rock. This standard specifies the in-situ method for conducting a uniaxial jacking test to determine the modulus of deformation of a rock mass. The results are essential for the design of foundations for heavy civil engineering structures like dams, large bridges, and underground powerhouses.
Code of practice for uniaxial jacking test for deformation modulus of rock
BIM-relevant code. See the BIM Hub for ISO 19650, IFC, and LOD/LOIN frameworks used alongside it.
| Parameter | IS Value | International | Source |
|---|---|---|---|
| Minimum Plate Diameter/Side | 75 cm | 500 mm (50 cm) | ISRM (1979) |
| Plate Size vs. Discontinuity | Diameter > 3 times the average joint spacing | Diameter > 5 to 10 times the average block size | ISRM (1979) |
| Maximum Applied Stress | Should not exceed 1/3 of the rock's UCS | The highest stress expected in the structure or a value not causing failure | ISRM (1979) |
| Number of Loading Cycles | 3 to 5 cycles | At least 2 cycles are recommended | ASTM D4394-17 |
| Deformation Stabilization Criteria | Deformation rate < 0.02 mm/hour | Deformation has 'substantially ceased' (not quantified with a specific rate) | ASTM D4394-17 |
| Governing Theory for Calculation | Boussinesq's equation for elastic half-space | Boussinesq's equation for elastic half-space | ASTM D4394-17 / ISRM (1979) |
| Number of deformation measurement points | Minimum 3, equally spaced around the periphery | Minimum 3, preferably more, at center and various radii | ASTM D4394-17 |