ANALISIS DAYA DUKUNG DAN PENURUNAN PONDASI TIANG PANCANG (Studi Kasus : Proyek Pembangunan Gedung Covid – 19 Medical Center Rumah Sakit Tentara Bhakti Wira Tamtama Kota Semarang)

ABSTRAK

Pekerjaan pondasi adalah pekerjaan pertama yang akan dilaksanakan dalam suatu pekerjaan konstruksi. Pondasi menjadi komponen yang sangat penting karena menopang semua beban yang terjadi pada sebuah bangunan. Data hasil penyelidikan tanah sangat penting dalam perencanaan pondasi. Pada Proyek Pembangunan Gedung Covid – 19 Medical Center Rumah Sakit Tentara Bhakti Wira Tamtama ini digunakan pondasi tiang (bored pile). Analisis ini bertujuan untuk mengetahui daya dukung, perbandingan dan penurunan pada titik P3 dengan kedalaman tiang 14 meter menggunakan data N-SPT. Perhitungan dilakukan dengan metode manual berdasarkan teori Mayerhoff (1956), Luciano Decourt (1978), serta menggunakan software AllPile versi 7.3B. Hasil analisis didapatkan daya dukung ultimit (Qu) menurut metode Mayerhoff (1956) 301,66 ton, Luciano Decourt (1978) 277,408 ton dan berdasarkan software Allpile 277,253 ton. Lalu
didapatkan daya dukung izin (Qall) menurut metode Mayerhoff (1956) 111,35 ton, Luciano Decourt (1978) 92,469 ton dan berdasarkan software Allpile 92,417 ton. Hasil perbandingan perhitungan daya dukung pondasi tiang pancang pada titik P3 menunjukkan bahwa metode Mayerhoff (1956) memiliki selisih tertinggi terhadap hasil software Allpile sebesar 8,81 % sedangkan metode Luciano Decourt (1978) sebesar 0,056 %. Hasil analisis penurunan tiang tunggal pada titik P3, perhitungan menggunakan metode Vesic (1970) menunjukkan nilai penurunan sebesar 21,05 mm dan hasil software Allpile menunjukkan hasil penurunan 1,86 mm. Semua metode menunjukkan hasil penurunan dibawah batas penurunan maksimum yaitu (10% x D) di dapat 30 mm, sehingga pondasi dinyatakan aman.

Kata Kunci: Pondasi, Bored Pile, AllPile, N-SPT, Penurunan

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ABSTRACT

The Foundation work is the first stage to be carried out in a construction project. Foundations play a crucial role as they support all the loads imposed on a structure. Soil investigation data is essential in foundation planning. In the Covid-19 Medical Center Building Project at Bhakti Wira Tamtama Army Hospital, a bored pile foundation was used. This analysis aims to determine the bearing capacity, comparison, and settlement at point P3 with a pile depth of 14 meters using N-SPT data. Calculations were performed manually using the methods of Mayerhoff (1956), Luciano Decourt (1978), and also by using AllPile software version 7.3B. The analysis results showed that the ultimate bearing capacity (Qu) according to Mayerhoff (1956) was 301,66 tons, Luciano Decourt (1978) was 277,408 tons, and the AllPile software yielded 277,253 tons. The allowable bearing capacity (Qall) was 111,35 tons for Mayerhoff (1956), 92,469 tons for Luciano Decourt (1978), and 92,417 tons according to the AllPile software. A comparison of the bearing capacity calculations at point P3 showed that Mayerhoff (1956) had the highest deviation from the AllPile software results at 8,81%, while Luciano Decourt (1978) had a deviation of 0,056%. The analysis of single pile settlement at point P3, using the Vesic (1970) method, yielded a settlement
value of 21,05 mm, while the AllPile software result was 1,86 mm. All methods showed settlement values below the maximum allowable limit ( 10% × D ), which is 30 mm, indicating that the foundation is considered safe.

Keywords : Foundation, Bored Pile, AllPile, N-SPT, Settlement