Testing and Monitoring
DYWI® Drill Hollow Bar System
On-site testing ensures the performance of the DYWI® Drill Hollow Bar System. This demonstrates both the quality and adequacy of the proposed design. Depending on the application, the appropriate test method should be chosen. Some tests may be more rigorous and are therefore conducted on sacrificial trial elements, installed as replicas of the working tendons.
The testing of ground anchors generally involves three categories of tests:
- Investigation Tests
- Conducted on trial anchors and tested to failure to ascertain the expected performance of the design.
- Suitability Tests
- Conducted on either sacrificial or working anchors to provide a data reference against which the working anchors can be measured.
- Acceptability Tests
- Conducted on working anchors to ensure construction methods and safety.
For micropiles and soil nails, investigation and suitability tests are generally utilised.
Investigation tests are used to assess design parameters, verify the pile design, prove the ultimate load resistance and creep characteristics of the grout ground interface and the system within its working range.
Suitability tests prove the construction methods and that the micropile or nail complies with the Specification.
Pull-out tests are the default on-site testing procedure for all tensile elements such as ground anchors and soil nails.
Depending on the loading mechanism (tensile, compression or aalternating), micropiles can be tested by either pull out tests or static load tests. Spiles and injection lances are generally not tested.
Testing and monitoring features economic advantages during the service life of the tendon. With information gained from in-situ tests and trials, an optimised assessment of the construction design may be possible. Monitoring and regular inspection increase the service life of both the tendon and therefore the entire retaining structure, as defects or damage can be detected at an early stage.
More information is given in the relevant codes and standards associated with these applications.