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

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (792.103 KB) | DOI: 10.30651/ag.v2i1.612

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

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (818.864 KB) | DOI: 10.30651/ag.v1i2.326

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
Pengaruh Kedalaman Dan Bentuk Penampang Terhadap Daya Dukung Dan Pengaruh Pondasi Tiang Ulfa, Nurul Fauzia; Isnaniati, Isnaniati; Farichah, Himatul
AGREGAT Vol 6, No 1 (2021): Vol.6, No.1 (2021)
Publisher : Universitas Muhammadiyah Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30651/ag.v6i1.8324

Abstract

AbstractIn general, the soil in Sidoarjo has a clay type soil. Clay soil has a low bearing capacity, large compression and lasts a long time. Pile foundation is part of the structure used to receive and transmit loads from the upper structure to the ground at a certain depth, it is necessary to analyze the bearing capacity of the foundation. By comparing the shape of square, circle and triangle cross sections to determine the bearing capacity of the foundation that is able to support the building above it using CPT and SPT data. Observed at the variation of the depth of 20 m, 25 m and 35 m, so that it can be seen the magnitude of the permit bearing capacity (Qallowed) and the amount of consolidation reduction (Sc) at each depth and each shape of the square, circle and triangle sections. The results showed that % of the permit bearing capacity (Qallowed) from the largest to the smallest at a depth of 20 m was 100% for square, 78.49% for circle, 70.55% for triangel, at a depth of 25 m was 100% for square, 78.52% for circle, 70.67% for triangle, and at a depth of 30 m it is a 100% for square, 78.50% for circle, 70.21% for triangle. The amount of settlement (Sc) on the pile at a depth of 20 m at 100% for square, 59.55% for circle, 59.55% for triangle, at 25 m depth is 100% for square, 88.48% for circle, 88.48 % for triangel, and at a depth of 30 m it is 100% for square, 43.34% for circle, 36.02% for triangel. Keywords : Pile bearing capacity, CPT, SPT, group pile, settlement AbstrakPada umumnya tanah yang terdapat di Sidoarjo memiliki jenis tanah lempung. Tanah Lempung memiliki daya dukung yang rendah, pemampatan yang besar dan berlangsung cukup lama. Pondasi tiang adalah bagian dari struktur yang digunakan untuk menerima dan menyalurkan beban dari struktur atas ke tanah pada kedalaman tertentu, maka perlu dilakukan analisa daya dukung pondasi . Dengan membandingkan bentuk penampang persegi, lingkaran dan segitiga untuk menentukan besarnya daya dukung pondasi yang mampu menopang bangunan diatasnya dengan menggunakan data CPT dan SPT.  Ditinjau pada  variasi kedalaman 20 m, 25 m dan 35 m, sehingga dapat diketahui besarnya daya dukung ijin (Qijin)  dan besarnya penurunan konsolidasi (Sc) pada masing-masing kedalaman dan masing-masing bentuk penampang persegi, lingkaran dan segitiga. Hasil penelitian diperoleh bahwa % daya dukung ijin (Qijin) dari yang terbesar sd terkecil di kedalaman 20 m adalah bentuk persegi 100%, bentuk lingkaran 78.49%, bentuk segitiga 70.55%, pada  di kedalaman 25 m adalah bentuk persegi 100%, bentuk lingkaran 78.52%, bentuk segitiga 70.67%, dan di kedalaman 30 m adalah bentuk persegi 100%, bentuk lingkaran 78.50%, bentuk segitiga 70.21%. Besarnya penurunan (Sc) pada tiang di kedalaman 20 m pada bentuk persegi 100%, bentuk lingkaran 59.55%, bentuk segitiga 59.55%, di kedalaman 25 m adalah bentuk persegi 100%, bentuk lingkaran 88.48%, bentuk segitiga 88.48%, dan di kedalaman 30 m adalah bentuk persegi 100%, bentuk lingkaran 43.34%, bentuk segitiga 36.02%. Kata Kunci : Daya dukung pondasi, CPT, SPT, tiang kelompok, penurunan