CD Tesis

Prakiraan Daya Dukung Fondasi Kelompok Tiang Helikal (Helical Pile) Di Tanah Gambut Berdasarkan Data CPT (Cone Penetration Test)

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Riau is an area with 3.867.413 Ha of peat lands, it reaches about 60,08% of total peat area on Sumatera Island. The leverage of peat becomes new problem to several aspects including, providing urban residences, roads, and agricultural infrastructures. The main problems that need to be solved in constructions on peat are the bearing capacity and stabilization of foundations. Therefore, a specific study about bearing capacity of foundation is required.
The formulation in this research is about foundation modeling (full scale model for helical piles group) with variation of piles number and discover the proper method to calculate the theoretic bearing capacity of helical piles group foundation by using Cone Penetration Test data on peat.
Main purpose of this research was to develop a method to determine helical piles bearing capacity based on CPT results. It focused on helical piles responses which relied on peat`s reaction towards load tests, and the details as follow:
1. Understanding Helical piles group foundation`s bearing capacity on peat.
2. Obtaining the proper method in order to determine theoretic bearing capacity of helical piles group foundation on peat according to CPT results, also validated with loading test results.
3. Identifying helical pile`s beaing capacity on peat by using individual bearing method and validated with loading test results.
4. Identifying helical pile`s bearing capacity on peat by using cylindrical shear method and validated with loading test results.
This research has used full scale of loading by CRP method (Constant rate of Penetration) standarized by ASTM 1143. Helical piles group configuration consisted of 3,4,5, and 6 piles with interval between each helical was two times of its diameter. Peat`s informations were obtained from CPT results and laboratory tests. Helical piles foundation analysis was supported by CPT data. Several methods were applied, i.e. Meyerhoff, LCPC, Phillipponat, De Beer, Schmertmann and Tumay & Fakhroo. Moreover, this research also used individual bearing and cylindrical method. Peat`s shear strength was determined by empirical correlation of qc data.
According to research on 5 configurations of helical piles group with LMS-30 type and the interval between each helical was 2D, several outcomes could be mentioned and concluded as below:
1. Peat test results on research location could be categorized as hemic medium ash (peat with medium composition of fibre and ash)
2. Comparisons between helical pile`s bearing capacity based on CPT data to Loading results, were De Beer method 90,14%, Phillipponat method 86,91%, and LCPC method 73,78%. Hence, these three methods are recommended in order to compute and determine the helical pile`s bearing capacity on peat.
3. Compared to loading test results, computation of helical pile`s bearing capacity by using individual bearing method has given close results with standard error between 1,20 – 2,20.
4. Computation by using cylindrical shear method has given a result where the value of helical pile`s bearing capacity becomes quite close to loading test results, with standard error between 2,40 – 4,55.
5. Individual bearing method has given better results compared to cylindrical shear method. This indicates the individual bearing method is more appropriate to be used to calculate helical pile`s bearing capacity on peat.
6. The efficiency of helical piles group with space of 2 times diameter of largest helical plate was about 0,89 – 1,20.


Key words : Peat, helical pile group, CPT, load test, bearing capacity, individual bearing, cylindrical shear

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Ketersediaan

Informasi Detail

Judul Seri

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No. Panggil

10 12. 219 (0007)

Penerbit

Pekanbaru : Universitas Riau – Pascasarjana – Tesis Teknik Sipil., 2019

Deskripsi Fisik

xvi, 123 hlm.; ill.; 29 cm

Bahasa

Indonesia

ISBN/ISSN

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Klasifikasi

10 12. 219 (0007)

Tipe Isi

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Tipe Media

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Tipe Pembawa

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Edisi

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Subjek

PASCASARJANA (MAGISTER) TEKNIK SIPIL

Info Detail Spesifik

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Pernyataan Tanggungjawab

FATAH

Versi lain/terkait

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