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Overview of foundation design for the burj dubai

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FOUNDATION SYSTEM GEOLOGY GEOTECHNICAL INVESTIGATION etc
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  • IN THE NAME OF EXISTENCE CREATOR
  • FOUNDATION DESIGN FOR THE BURJ DUBAI (THE WORLDS TALLEST BUILDING) typical of presentation OVERVIEW OF 1 Of 44
  • REMINDER-PILED RAFT & RAFT FOUNDATION FOUNDATION SYSTEM GEOLOGY GEOTECHNICAL INVESTIGATION REMINDER-STANDARD PENETRATION TEST (SPT) REMINDER-APPLICATIONS OF STANDPIPE PIEZOMETER REMINDER-APPLICATIONS OF OYO ELASTMETER REMINDER-DOWN-HOLE GEOPHYSICAL METHODS LABORATORY TESTING GEOTECHNICAL CONDITIONS GEOTECHNICAL MODELS AND ANALYSES 2 Of 44
  • FOUNDATION DESIGN LIQUEFACTION ASSESSMENT PIGS RESULTS FOR TOWER & PODIUM PILE LOAD TESTING PRELIMINARY PILE TESTING PROGRAM ULTIMATE SHAFT FRICTION LOAD-SETTLEMENT BEHAVIOUR PILE AXIAL STIFFNESS PREDICTIONS (cont..) 3 Of 44
  • The Burj Dubai Project is a multi-use development tower with a total floor area of 460,000 square meters that includes residential, hotel, commercial, office, entertainment, shopping, leisure, and parking facilities. The Burj Dubai project is designed to be the centerpiece of the large scale Burj Dubai Development that rises into the sky to an unprecedent height that exceeds 800 meters 4 Of 44
  • Most of the tower is a reinforced concrete structure, except for the top, which consists of a structural steel spire with a diagonally braced lateral system The Architects and Structural Engineers for the project were Skidmore Owings and Merrill LLP (SOM) in Chicago The site is generally level and site levels are related to Dubai Municipality Datum (DMD). 5 Of 44
  • The Burj Dubai project in Dubai comprises the construction of an approximately 160 storey high rise tower, with a podium development around the base of the tower 6 Of 44
  • Pile applications Soft to Firm Clay Large Distributed Weight Very Large Concentrated Weight Strong Rock Low Weight 7 Of 44
  • Raft foundation is a large combined thick slab designed to supports the whole or a large part of a structure. Raft foundation is usually used when subsoil is weak and have low bearing capacity. A raft foundation is also known as mat foundation. A raft foundation is use to distribute the building pressure over a large area so the soil can bear the stress. 8 Of 44
  • Piled raft is a foundation system consisting of piles & raft. The piles can be designed in such cases to carry loads close to their ultimate capacity. It is assumed that the total applied load has to be carried only by the piles with certain FOS, against bearing capacity. 9 Of 44
  • Piled raft foundation is more economic foundations when compared to pure pile foundations when considering bearing capacity. Piled raft foundation reduces the settlement comparison with a raft foundation. 10 Of 44
  • The foundation system for the tower is a piled raft, founded on deep deposits of calcareous rocks The tower is founded on a 3.7m thick raft supported on 194 bored piles, 1.5 m in diameter, extending 47.45m below the base of the raft; 11 Of 44
  • Figure 1. plan view of the Khalifa Tower foundation system podium structures are founded on a 0.65 m thick raft (increased to 1m at column locations) supported on 750 bored piles, 0.9 m in diameter, extending 30-35 m below the base of the raft. A plan view of foundation is shown in Fig. 1. (cont..) 12 Of 44
  • As such, the floor plan of the tower consists of a tri-axial, Y shaped plan, formed by having three separate wings connected to a central core (cont..) 13 Of 44
  • The geology of the Arabian Gulf area has been substantially influenced by the deposition of marine sediments resulting from a number of changes in sea level during relatively recent geological time. The country is generally relatively low-lying (with the exception of the mountainous regions in the northeast of the country), with near-surface geology dominated by deposits of Quaternary to late Pleistocene age, including mobile Aeolian dune sands, evaporite deposits and marine sands. Persian the persian gulf blind eye to enemies 14 Of 44
  • The geotechnical investigation was carried out in four phases as follows: Phase 1 (main investigation): 23 boreholes, in situ SPTs, 40 pressuremeter tests in 3 boreholes, installation of 4 standpipe piezometers, laboratory testing, specialist laboratory testing and contamination testing 1st June to 23rd July 2003; Phase 2 (main investigation): 3 geophysical boreholes with cross-hole and tomography geophysical surveys carried out between 3 new boreholes and 1 existing borehole 7th to 25th August, 2003; 15 Of 44
  • Phase 3: 6 boreholes, in situ SPTs, 20 pressuremeter tests in 2 boreholes, installation of 2 standpipe piezometers and laboratory testing 16th September to 10th October 2003; Phase 4: 1 borehole, in situ SPTs, cross-hole geophysical testing in 3 boreholes and down- hole geophysical testing in 1 borehole and laboratory testing. (cont..) 16 Of 44
  • Standpipe piezometers are used to monitor piezometric water levels. Water level readings are typically obtained with a water level indicator. Typical applications include: Monitoring pore-water pressure to determine slope stability. Monitoring seepage and ground water movement. 17 Of 44
  • The drilling was carried out using cable percussion techniques with follow-on rotary drilling methods to depths between 30m and 140m below ground level Disturbed and undisturbed samples and split spoon samples were obtained from the boreholes. (cont..) 18 Of 44
  • 19 Of 44
  • Standard Penetration Tests (SPTs) were carried out at various depths in the boreholes and were generally carried out in the overburden soils, in weak rock or soil bands encountered in the rock strata. Summary of Measured SPT Values Elevation m Range of SPT Values 2.5 to -1 0-40 -1 to -8 50-400 -8 to -14 0-100 -14 to -30 40-200 -30 to -40 100-200 -40 to -80 100-400 (cont..) 20 Of 44
  • Pressuremeter testing, using an OYO Elastmeter, was carried out in 5 boreholes between depths of about 4m to 60m below ground level typically below the Tower footprint. (cont..) 21 Of 44
  • Determination of shear modulus, G. Determination of fluency pressure. Determination of limit pressure. 22 Of 44
  • The geophysical survey comprised cross-hole seismic survey, cross-hole tomography and down-hole geophysical survey. The main purpose of the geophysical survey was to complement the borehole data and provide a check on the results obtained from borehole drilling, in situ testing and laboratory testing. (cont..) 23 Of 44
  • Downhole geophysical logging is a technique used to determine the physical properties and distribution of soil and rock surrounding a borehole annulus . From these measurements, physical properties such as density, porosity, thickness, orientation, and lithological identification of soil and rock surrounding the borehole annulus may be determined. DOWN-HOLE GEOPHYSICAL METHODS 24 Of 44
  • The cross-hole seismic survey was used to assess compression (P) and shear (S) wave velocities through the ground profile. Cross-hole tomography was used to develop a detailed distribution of P-wave velocity in the form of a vertical seismic profile of P-wave with depth, and highlight any variations in the nature of the strata between boreholes. Down-hole seismic testing was used to determine shear (S) wave velocities through the ground profile. (cont..) 25 Of 44
  • (cont..) 26 Of 44
  • Laboratory Testing The geotechnical laboratory testing program consisted of two broad classes of test: 1. Conventional tests, including moisture content, Atterberg limits, particle size distribution, specific gravity, unconfined compressive strength, point load index, direct shear tests, and carbonate content tests. 2. Sophisticated tests, including stress path triaxial, resonant column, cyclic undrained triaxial, cyclic simple shear and constant normal stiffness (CNS) direct shear tests. These tests were undertaken by a variety of commercial, research and university laboratories in the UK, Denmark and Australia. 27 Of 44
  • The ground conditions comprise a horizontally stratified subsurface profile which is complex and highly variable, due to the nature of deposition and the prevalent hot arid climatic conditions. 28 Of 44
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