Analisis Perbandingan Kapasitas Dukung Dan Penurunan Fondasi Tiang Pancang Berdasarkan Data Uji Laboratorium Dan Uji Pda (Pile Driving Analyzer) Gedung Masjid Raya Provinsi Riau

Buchika, Rizky Evan (2022) Analisis Perbandingan Kapasitas Dukung Dan Penurunan Fondasi Tiang Pancang Berdasarkan Data Uji Laboratorium Dan Uji Pda (Pile Driving Analyzer) Gedung Masjid Raya Provinsi Riau. Other thesis, Universitas Islam Riau.

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Abstract

The construction of the Riau Province Grand Mosque was carried out in 2018 on Jl. Cross Sumatra, Palas, District Rumbai, Pekanbaru City, Riau. At that location, three kinds of soil investigations were carried out, namely cone penetration test, standard penetration test and soil laboratory test. The results of the investigation consist of cohesive soil to a depth of 10 m and so on up to 29.5 m consisting of granular soil. The type of foundation used is a 25x25 cm rectangular pile with K-450 concrete quality, driven by the blow method using a diesel hammer, from the driving data there are several piles that experience cracks when driving and a significant difference in depth on one of the piles. This condition has its own charm for researchers to find out the comparison of the value of bearing capacity, settlement value, and the value of the safety factor for single pile foundations based on the data obtained, the research was carried out only on pile foundations that have been tested by pile driving analyzer, namely pile cap F9 grid C7. There are many methods used in analyzing the bearing capacity of the foundation. Calculation analysis in this study was carried out based on soil parameters obtained from laboratory test results, for static analysis the Alpha method, the Lamda method, and the US Army Corps method were chosen to analyze the frictional resistance in cohesive soils, the Kulhawy method, the Poulos and Davis method, and also the method US Army Corps to analyze frictional resistance and end resistance in granular soils. For numerical analysis xviii of the finite element method using the Plaxis program based on the design load obtained using the Etabs program. From the calculation analysis, the results of the comparison of the allowable bearing capacity (Qa) of all single piles using the static method are 163.392 kN - 309.494 kN, the finite element method of the Plaxis 2D program is 184.632 kN - 222.352 kN, which means all the results of the allowable bearing capacity (Qa) the foundation is able to support the design load (Pi) obtained from the Etabs program, which is 129.67 kN - 151.69 kN, and is much smaller than the permit bearing capacity of the pile driving analyzer test results, which is 510.4 kN. Immediate reduction using the Poulos and Davis static method obtained smaller results, namely 0.66 mm - 1.8 mm compared to the finite element method of the Plaxis 2D program of 5.56 mm - 8.91 mm and the pile driving analyzer test results were 7 mm. The value of the safety factor (SF) for static analysis and numerical analysis obtained results of 3 - 5.9 due to the large ultimate bearing capacity, but these results are abnormal or inefficient controls in their implementation, for planning the construction of permanent buildings for normal control generally the safe factor value is used ≥ 2.5. On pile number 4 with the smallest penetration depth among all piles (12 m) the results are (Qa) > (Pi) with (SF) > 2.5. The possibility of cracking during driving (piles 5, 6 and 8) is the result of excessive driving because the pile has reached hard ground at a depth of > 12 m and is able to support the design load at that depth like pile number 4. , settlement and safety factor, pile number 4 obtained the smallest value, but is still able to support the design load, so it is better if the driving is only at a depth of 12 m such as pile number 4 to be more efficient or it is better if the pile on the C7 grid foundation only requires < 9 piles if staked at a depth of ≥17 m.

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