BS EN ISO 22476-7:2012 specifies the equipment requirements, execution of and reporting on borehole jack tests.
BS EN ISO 22476-7:2012 specifies the procedure for conducting a borehole jack test in ground stiff enough not to be adversely affected by the drilling operation. Two diametral cylindrical steel loading plates are placed in the ground and opened by pressure. Pressure applied to, and associated opening of the probe are measured and recorded so as to obtain a stress-displacement relationship of the ground for the range of the expected design stress.
Contents for BS EN ISO 22476-7:2012 includes:
Scope
Normative references
Terms, definitions and symbols
Terms and definitions
Symbols and abbreviations
Equipment
Test procedure
Calibration of the testing device
Pocket drilling and device placing
Loading programme
Back-filling of borehole
Safety requirements
Test results
Basic equations
Loading tests
Constant load test
Reporting
General
Reporting of test results
Choice of axis scaling
Presentation of test results
This British Standard is the UK implementation of EN ISO 22476-7:2012. It partially supersedes BS 5930:1999+A2:2010, which is currently being revised in order to remove conflicting material.
ISO 22476 consists of the following parts, under the general title Geotechnical investigation and testing — Field testing:
- Part 1: Electrical cone and piezocone penetration test
- Part 2: Dynamic probing
- Part 3: Standard penetration test
- Part 4: Ménard pressuremeter test
- Part 5: Flexible dilatometer test
- Part 7: Borehole jack test
- Part 9: Field vane test
- Part 10: Weight sounding test [Technical Specification]
- Part 11: Flat dilatometer test [Technical Specification]
- Part 12: Mechanical cone penetration test (CPTM)
