3410 TERMINAL AVE 2018-03-09 - Laserfiche WebLink

SIi11 is I ' Final pile acceptance would be based on the blow count resistance measured during impact driving as compared to the results of the test piles. 7.1.4 Pile Testing The axial resistance parameters recommended in this report are based on assumed subsurface conditions and local experience. Based on our experience, dynamic pile testing is a cost- effective method for determining the total ultimate capacities and load distribution along the ' piles. To substantiate pile embedment for the required capacity and vertical spring stiffness, we recommend that dynamic pile testing be performed on a minimum of two piles. One pile should be located on the northern end of each bents B and G. These piles should be the first piles installed prior to the remaining production piles. The Port should contract with the Contractor to perform additional testing and restrikes during production pile driving should the observed ' driving resistance not meet the driving criteria established by the initial test piles. An impact hammer will be necessary to perform the dynamic testing. Dynamic testing is ' performed by placing instruments on the pile and obtaining dynamic measurements during driving using a Pile Driving Analyzer(PDA). Dynamic testing should be performed during the final portion of continuous impact driving. The two test piles should be driven not closer than 1 1 foot from final cut-off elevations and should be allowed to set up for a minimum of 24 hours before a restrike is performed. During restrike, the piles should be driven a minimum of 1 foot. The data collected are used to develop pile driving criteria and design lengths. Typically,the Contractor is required to hire a specialty subcontractor to perform the PDA measurements and calculate pile capacity using the Case Pile Wave Analysis Program(CAPWAP). The CAPWAP ' analysis should be performed for the end of continuous driving condition and the beginning of restrike condition. ' 7.2 Settlement and Vibration Due to Pile Installation Settlement of the existing ground surface could occur during closed-end pipe pile installation. The settlement could be several inches within 5 feet of the pile-driving locations,but would generally decrease exponentially with distance away from the pile-driving locations. If vibratory ' hammers are used, settlements could be reduced if the hammer allows for variable moment operation. The Contractor should be prepared to repair pavements and other facilities close to the pile driving operations. In addition, we recommend that the Contractor be contracted to conduct a daily displacement survey of the existing wharf to assess displacements induced by the upgrade construction. The results of the surveys should be provided to the entire design team 21-1-21962-003-R2.docx/wp/cp 21-1-21962-003 13