1007.3( j) 1007. 3(j)
Perform Verification Load Test on a test micropile as indicated, or as directed by the Structure Control Engineer . Verification Load test the first production pile installed at each designated substructure unit before the installation of the remaining piles in that unit. Two additional production piles may be installed to serve as reaction piles for the test. T he acceptance criteria for the V erification Load T est are:
1.a The pile must sustain the DL with no more than 0.75 inches of total vertical movement at the top of the pile as measured relative to the top of the pile before the start of testing. If an alignment load is used, then the allowable movement will be reduced by multiplying by a factor of (DL- AL)/DL.
1.b Test piles must have a creep rate at the end of the 1.3 DL increment which is not greater than:
• 1/32 inch/log cycle time (1 to 10 minutes), or
• 1/16 inch/log cycle time (6 to 60 minutes) and has a linear or decreasing creep rate.
1.c Failure does not occur by 2.0 DL. Failure is defined as a slope of the load versus deflection curve (at end of increment) exceeding 0.025 inch/kip.
Su bmit the Verification Load T est time-load settlement data and graph ical representations of the data which show the acceptance criteria and the actual test data of the pile being load tested to the Structure Control Engineer and District Geotechnical Engineer . For test piles , the test results must be reviewed and accepted by the Structure Control Engineer before beginning the construction of any production piles represented by the test pile. The drilling and grouting methods, pipe casing, grout, and minimum depth of embedment of the production micropiles must be identical to those of the accepted verification test micropile. If a verification -tested micropile fails to meet the acceptance criteria, modify the construction procedure. Modifications may include, but are not limited to, modifying the installation method, installation equipment, or installed material as required to achieve acceptable verification tests. Submit proposed modifications of the accepted Work Plan to the Structure Control Engineer and the Designer for review and acceptance. Costs resulting from any micropile construction procedures that deviate from the accepted Work Plan, and the associated costs of additional verification testing, will be at the Contractor's expense. Any modifications of the micropile design that are due to changes or limitations in equipment or material will be at the Contractor's expense. These modifications include, but are not limited to, changes to maximum load, bond length, or micropile type, siz e or spacing. The Structure Control Engineer' s and the Designer's prior review and acceptance is requir