ANALISA DAYA DUKUNG DAN DRIVEABILITY FONDASI TIANG PANCANG JALAN TOL BINJAI – STABAT

Abstract

The foundation is a part of the structure that has the function of transferring the load of the upper building to a layer of soil or rock that has a certain bearing capacity. When designing a foundation, the load received by the foundation must not exceed its bearing capacity. The accuracy of determining the bearing capacity of the pile is done by the dynamic method, which greatly affects the design, construction, and cost of the foundation. Recent developments in the evaluation of pile bearing capacity analysis using the dynamic method and driveability analysis are performed using the wave equation with GRLWEAP software. The calculated bearing capacity includes peak bearing capacity and area bearing capacity. The calculation was performed using the Meyerhoff (1976) method approach. After obtaining the bearing capacity values from GRLWEAP test interpretation and SPT test calculation, the GRLWEAP test bearing capacity value is compared with the SPT calculation bearing capacity value, the compared bearing capacity is the total bearing capacity or ultimate bearing capacity. After knowing the values of peak bearing capacity (Qp) and ceiling bearing capacity (Qs), the ultimate bearing capacity of 8112,300 kN at a depth of 48.45 meters is obtained. The pile specifications used as processing data are spun pile with diameter 600 mm, length 56 m, cross sectional area 2827 cm2, toe area 2827.4 cm2, perimeter 1.88 cm, Young's modulus 34500 MPa, and specific gravity 23.6 kN/m3 for all pile calculations. The maximum ultimate bearing capacity (Qult) in the Mayerhoff (1976) method is 8112.3 kN and from the GRLWEAP test results of 7647.8 kN, the margin obtained from the two analyses is 6.074%. the compression stress results on PT. WIKA pile material gives a margin with the actual stress results in the GRLWEAP analysis of 6.515%. Tensile stress at ultimate stress gets a margin with the actual stress result of -1.365%. The actual stress in the material is bigger than the ultimate stress, which means that the pile can still be driven to a depth of 48m.