Tahanan Lateral Pondasi Tiang Berdasar Cone Penetration Test
DOI:
https://doi.org/10.24002/jts.v15i4.3798Abstract
Kapasitas beban lateral pondasi tiang (Pu) merupakan hal utama untuk perencanaan konstuksi dengan beban lateral yang cukup dominan. Kapasitas Pu didasarkan pada kondisi keseimbangan resultan gaya pada tiang dan ketahanan tanah lateral serta distribusi tekanan tanah PL sepanjang kedalaman tiang berdasarkan metode konvensional, tetapi sulit diterapkan pada tanah nonhomogen, karena kondisi tanah nonlinier terhadap kedalaman. Insitu test yang paling sering digunakan karena mudah, cepat dan hemat biaya adalah cone penetration test (CPT), yang memberikan profil tanah secara kontinu, dan lebih mendefinisikan jenis lapisan, ketebalan, dan kepadatan dari masing masing lapisan. Meskipun jarang disebut dalam literatur tentang penggunaan data CPT untuk menganalisa perilaku defleksi pondasi tiang, beberapa peneliti menyatakan hubungan antara resistensi kerucut qc dan tahanan lateral tanah Pu di sepanjang kedalaman tiang. Salah satu metode yang menyajikan pengembangan metode kurva p-y untuk pondasi tiang dengan dasar resistensi penetrasi kerucut qc adalah Bouafia, A. (2014). Berdasarkan pengembangan oleh Bouafia, penulis menganalisa hubungan antara resistensi kerucut qc dan ketahanan lateral tiang Pu untuk menentukan beban lateral pondasi tiang pada tanah lunak di Wates, Kulon Progo DIY dan dibandingkan dengan teori Broms 1964; metode Kurva p-y, dan pengembangan rumus Bouafia, dengan kekakuan tiang, jenis tanah dan defleksi maksimum yang sama maka diperoleh sebagai berikut, teori Broms, LBroms=14,16m ; PuBroms=32,4ton ; MBroms=19,88tonm. Metode Kurva p-y, Lp-ycurve =14,4m ; Pup-ycurve s=28,0ton ; Mp-ycurve =7,50tonm dan Metode Bouafia, LBouafia =17,9m ; PuS2bouafia=34ton; PuS4bouafia=14,8ton; MS2bouafia =11,3tonm ; MS4bouafia =4,9tonm.References
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