Kajian Daya Dukung dan Penurunan Tiang Pancang Beton Berdasarkan Data Lapangan, Laboratorium, dan Menggunakan Program Plaxis Di Sepanjang Sungai Percut, Sumatera Utara

Abstract

Pile foundations is one used to transfer the structural loads to soils. The application of concrete driving pile is usually a greater preference due to it's ability to withstand on pulling stresses in the course of lifting, transporting and driving. A prestressed concrete pile is a type of popular pile suitable to massive production such as prestressed spun concrete pile produced by using concrete and high strenght steel by an actual designing method. Thus this sort of pile can result in a great financial efficiency. The objective of this thesis will be to calculate the bearing capacity, settlement, and the effect of geological condition on bearing capacity and settlement of pile, using finite element Plaxis program, and the result is compared to loading test. In addition being compared to loading test, it is also compared to bearing capacity of calculation result of field and laboratory data. This research is conducted in piles on locations of P 1, BS, P2, P3, P5, P6, P7, P9, Pl 1, and Pl3. From the result of calculation by working load through Plaxis program, it is same as working load on loading test: 1) The threshold ultimate bearing capacity (ultimate output) of Plaxis program in locations mentioned above is less than loading test. 2) Output of Plaxis program in locations P2, P5, P7, and P9 indicates significant settlement compared to loading test. 3) Pennanent settlement in locations Pl, P3, and P6 from output of Plaxis program is less than the result of loading test. 4) Maximal settlement during maximum loading from output of Plaxis program in locations P3 and P6 is less than loading test. 5) Maximal rebound of elasticity in locations P3 and Pl I of Plaxis program output is less than result of loading test. 6) Permanent settlement, maximql settlement during maximal loading and maximal rebound of elasticity tends to be less toward upstream of river Percut. 7) The concrete driving pile is shorter toward upstcam of river Pcrcut largely due to effect of geological condition in which the depth of clay soil is thinner progrcssivdy. Conclusion of the calculation is that permanent settlement, maximal rebound of elasticity, maximal settlement during maximal loading of all piles observed is in variation, some is larger, and some is smaller than loading test. The values of settlement tend to be smaller, while supporting force tends to be larger toward upstream ofriver Percut.