Isnaniati Isnaniati, Isnaniati
Universitas Muhammadiyah Surabaya

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Minimalisasi Jumlah Tiang dalam Group Pile Melalui Pemilihan Bentuk Dasar Penampang Pondasi Tiang pada Tanah Lempung Isnaniati, Isnaniati; Riduwan, Riduwan
Jurnal Semesta Teknika Vol 17, No 2 (2014): NOVEMBER 2014
Publisher : Jurnal Semesta Teknika

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Abstract

Having very small coefficient of seepage, wide clog, , soil bearing capacity is very low., create the complexity of clay. The pole foundation is what frequently used in clay. Mostly the hard layer of clay soil is far lying under ground along with the rare use of hexagonal foundation which had widely been circular and rectangular. Minimizing the pole in pile group is one of the alternatives to reduce the construction budget. By comparing the pole circle-basis, rectangular, and hexagonal section with variation of dimension 0.3; 0.35; 0.4m, an investigation to the number of pole in pile group based on SPT for vertical soil bearing capacity as well as lateral Brooms method at each cross-sectional shape of the pole is carried out. The results obtained shows similar diameter which finds the number of poles at least up to the highest, in the pile group is a consecutive sequence of rectangular cross-sectional shape of the first, second is a circle, and the third is a hexagon. The percentage of number of rectangular pole   78% from circular and 73% from hexagonal shape.
Kontribusi Bentuk Penampang Tiang Terhadap Beban Maximum yang Diterima Pondasi untuk Perencanaan Pondasi pada Tanah Lempung dengan Data CPT Surabaya Isnaniati, Isnaniati
AGREGAT Vol 2, No 1 (2017)
Publisher : Universitas Muhammadiyah Surabaya

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Abstract

Surabaya city is generally dominated by clay soil. This type of soil has several problems such as low coefficient of permeability, large settlement, and low bearing capacity. Pile foundation is common foundation type applied in clay soil which bedrock layer is relatively deep enough from ground surface. Moreover, pile foundation also has various shapes of cross section which can be appiled in field. The maximum load applied to foundation should be taken into account in order the maximum load (Qmax) does not exceed the allowable bearing capacity of soil (Qallowable).By comparing the cross sections of pile foundation including circle, square, and hexagon, the behaviour of maximum load applied to foundation (Qmax) is investigated based on the results of CPT (Cone Penetrasi Test) using “Philliponnat” method with variations of diameter are 0,3; 0,4; 0,5m at the test locations of (S1, S2 & S3) in order to obtain Qmax < Qallowable.The result of this study indicates that maximum load (Qmax) at the locations of S1, S2 & S3, sorted from the greatest to smallest, are obtained by the cross section shapes of squre, circle, and hexagon. Thereunto, the persentage of maximum load (% Qmax) to the cross section of square at S1 are 100% for square, 79.84% for circle, and 72.01% for hexagon. In addition, at S2 are 100% for square, 74% for circle, and 70,28% for hexagon. The % Qmax at S3 are 100% for square, 95,19% for circle, and 78,82% for hexagon.
MINIMALISASI JUMLAH TIANG DALAM GROUP PILE MELALUI PEMILIHAN BENTUK DASAR PENAMPANG PONDASI TIANG PADA TANAH LEMPUNG Isnaniati, Isnaniati
AGREGAT Vol 1, No 2 (2016)
Publisher : Universitas Muhammadiyah Surabaya

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Abstract

ABSTRACTHaving very small coefficient of seepage, wide clog, ,soil bearing capacity is very low., create the complexity of clay. The pole foundation is what frequently used in clay. Mostly the hard layer of clay soil is far lying under ground along with the rare use of hexagonal foundation which had widely been circular and rectangular. Minimizing the pole in pile group is one of the alternatives to reduce the construction budget.By comparing the basic shape cross-section of the pole is a circle, square, and hexagon with dimensional variations (0.3; 0.35; 0.4m) and soil data (BH1, BH2, BH3) do research on the number of poles in a pile group based on data from the N-SPT.  Vertical bearing capacity is calculated based on the theory Decourt Luciano (1982)  and the number of poles were studied based on the number nhitung.The results were obtained, with the same dimensions, the number of poles (nhitung) in the group pile, from the least to the most row is the first order form of square cross-section, the second order is a circular shape, and the third is a hexagon.With % nhitung square shape of the circle is 79% and %  nhitung square shape of  the  hexagon  is  93%.Keywords : Coefficient of seepage , soil bearing capacity , SPT , nhitung ABSTRAKTanah lempung merupakan tanah yang sangat bermasalah  karena mempunyai koefisien rembesan yang sangat kecil, kemampumampatannya   besar, dan daya dukung tanah yang sangat rendah. Pondasi tiang merupakan pondasi yang biasanya  digunakan dilapangan dengan  kondisi tanah lempung. Tanah yang dominan lempung   umumnya letak tanah kerasnya berada jauh  dibawah  permukaan tanah, serta langkanya penggunaan bentuk dasar penampang tiang  segienam dilapangan yang selama ini hanya bentuk lingkaran dan persegi  yang banyak digunakan . Meminimalkan jumlah tiang dalam group pile merupakan salah satu alternatif untuk menurunkan anggaran biaya konstruksi bangunan.Dengan cara membandingkan bentuk dasar penampang tiang yaitu lingkaran , persegi , dan segi enam  dengan  variasi dimensi (0,3 ; 0,35; 0,4 m)dan data tanah (BH1, BH2, BH3) dilakukan penelitian  terhadap  jumlah tiang dalam group pile berdasarkan data N-SPT . Daya dukung tanah vertikal dihitung berdasar teori  Luciano Decourt(1982) dan  jumlah tiang yang diteliti berdasar jumlah nhitung.Dari hasil penelitian diperoleh dengan dimensi yang sama maka  jumlah tiang  (nhitung) dalam grup pile dari yang paling sedikit  sampai dengan yang paling banyak  berturut-turut adalah urutan pertama bentuk penampang persegi, urutan kedua adalah bentuk lingkaran, dan urutan ketiga adalah segi enam.  Dengan %  nhitungbentuk persegi terhadap lingkaran adalah 79% dan % nhitung bentuk persegi terhadap segi enam  adalah  93%.Kata kunci : Koefisien rembesan,  daya dukung tanah, SPT, nhitung