Capacidad de carga y asentamientos en pilas de cimentaciónFull description
calculate Safe Bearing Capacity of SoilDescripción completa
Capacidad de carga y asentamientos en pilas de cimentación
foundation
Full description
kmk
Rumus Bearing
Rumus Bearing
Full description
Seldom has a structure collapsed or tilted over from a base shear failure in recent times. Most reported base failures have occurred under embankments or similar structures where a low facto…Descripción completa
lolFull description
Method for bored pile capacity calculationFull description
Pile capacity caculation as per iRC78
Vesic
Descrição: Vesic
BEARING CAPACITY OF PILE FOUNDATION & CONSTRUCTION By Tin Soe Myanmar Geologist Society (Singapore)
Pile Foundation Shallow Foundation & Deep Foundation
Soil immediately below the Footing is strong enough to carry the Building Loads.
Shallow Foundation
Shallow Foundation
Sh ll F d i Shallow Foundation The Building Load is Distributed in a Large Area
Mat Foundation or Raft Foundation
Shallow Foundation B D A
I
E
B
III II
C
D
Shallow Foundation Ultimate Bearing Capacity (qu)
Shallow Foundation
Shallow Foundation
Shallow Foundation
Plate Bearing Test is carried out to
verify Bearing Capacity of Soil Underneath The Test will be carried out in general
accordance with BS 1377: Part 9, 1990 d ith BS P t In‐Situ Test
Typical Use for Plate Bearing Test Roads and Car Parks Building & Structure (Below B ildi & S (B l
Foundation & Ground Floor Slabs) Mobile Crane Mats Piling Mats g
Sh ll F d i Shallow Foundation
Plate Bearing Test
Shallow Foundation S a ow ou dat o
Plate Bearing Test
It is a Foundation System that It i F d ti S t th t transfers loads to deeper and p competent soil layer
q g Capacity of p y Inadequate Bearing Shallow Foundations To Prevent Uplift Forces To Reduce Excessive Settlement
Friction Pile L d B i R i t Load Bearing Resistance derived d i d mainly from skin friction End Bearing Pile Load Bearing Resistance derived mainly from base
Friction Pile
Overburden Soil
O Over
End Bearing Pile
Overburden Soil
Rock / Hard Layer
Weak Soil
Bearing Soil g
Pile Foundation
Single Pile Capacity
Pile Foundation Meyerhof (1976) Qf = A Abqf + A Asfs
Pile in Sands
qf = 40N Db ≤ 400N (kN/m2), fs = 2N B qf = Ultimate End Bearing Capacity fs = Ultimate Shaft Friction N= SPT value N= Average SPT value Db = Pile length B = Pile Base Ab = Base Area, A Base Area As = Shaft Area Shaft Area
Pile Foundation
Pile Foundation Pile Foundation Skin Friction of Bored Piles (CP4) Bukit Timah & Jurong Formation fs = 1.5 N to 2.5 N, subject to maximum 150 kPa Old Alluvium Formation fs = 2 N to 3 N, subject to maximum 300 kPa N t N bj t t i kP
End Bearing of Bored Piles (CP4) qb = Kb (40 N), subject to maximum 10 Mpa Where Kb = 1 to 3
Pile Foundation Meyerhof (1976)
Pile in Clay
qf = cu Nc , fs = α cu Nc = 9 , cu = Undrained d d Shear Strength (UU) h h( ) α = 0.3 to 1.0
Pil F d ti Pile Foundation
Pile Foundation e ou dat o Effective Stress Sandy Soil
Pile Foundation
Pile Foundation
Pile Foundation
Pile Foundation
Pile Foundation
Pile Foundation Clay Soil
Pile Foundation
Pile Foundation Bored Piles Clays Ultimate End Bearing Resistance~ qb = Nc Cu
(Nc = may generally be taken as 9) Ultimate Shaft Resistance ~ T Ultimate Shaft Resistance Ts = α Cu Where α = adhesion factor
Pile Foundation Bored Piles Clays
α‐value Whitaker & Cooke (1966) : 0.3 to 0.6 Tomlinson (1994), Reese & O Tomlinson (1994) Reese & O’Neill (1988) :0 Neill (1988) :0.4 to 0.9 4 to 0 9 Cu is generally determined from UU tests
Pile Foundation
NEGATIVE SKIN FRICTION (NSF)
Compressible Soil Layer C ibl S il L Consolidation and Causes of Ground Settlement; Surcharge of Fill Lowering of Ground Water Table Dissipation of excess pore water pressures generated by pile driving
Negative Skin Friction
Negative Skin Friction
Negative Skin Friction g
Pile Foundation
Meyerhof 4.37
fs = β β σ’v Where β = Ks tan δ and δ d δ is the pile‐soil friction angle i h il il f i i l
NSF Preventive Measure Avoid Filling Carry out Surcharge Sleeve Pile Shaft Slip Coating Reserve Structural Capacity for NSF Allow for Larger Settlement
Timber Piles Ti b Pil RC Square Piles Concrete Spun Piles Steel Piles Bored Piles Micro Piles Mi Pil Caisson Piles
RC Square Piles Sizes: 150mm ~400mm Length: 3m, 6m, 9m, 12m Length: 3m 6m 9m 12m Structural Capacity: 25Ton ~185Ton Material: Grade 40MPa Concrete M i l G d MP C Joint: Welded Installation Method: Drop Hammer Jack‐in
Pile Foundation
RC piles
Jack‐in Pile Use of Hydraulic Pressure to install RC
Piles into Soil Strata. Lack of Noise and Exhaust, Installation Process is easy with low cost. Process is easy with low cost Use Especially for Residential Area
Pile Foundation Pile Foundation
Jack‐in Pile
Concrete Spun Piles Size: 250mm~1000mm Length: 6m, 9m, 12m(Typical) Length: 6m 9m 12m(Typical) Structural Capacity: 45 Ton~520Ton Material: Grade 60Mpa ~ 80Mpa M i l G d 6 M 8 M Joint: Welded Installation Method: Drop Hammer Jack‐in
Pile Foundation
Concrete Spun Pile
Spun Pile Vs RC Square Pile Spun Pile have; Better Bending Resistance Higher Axial Capacity Able to Sustain Higher Driving Stress Higher Tensile Capacity Easier to Check Integrity of Pile Better Manufacturing Quality Similar Cost as RC pile
Steel H Piles Size: 200mm ~ 400mm Length: 6m, 12m Structural Capacity: 40 Ton ~1000 Ton 5 Material: 250N/mm2 ~ 410N/mm2 Join: Welded y Installation Method: Hydraulic Hummer Jack‐in
Pile Foundation
Steel H Pile
Large Diameter Cast In‐Situ Piles (Bored Piles) Large Diameter Cast In Situ Piles (Bored Piles) Size: 450mm ~ 2000mm Si mm mm Length: Varies Structural Capacity: 80 Ton ~5700 Ton S l C i 8 T T Material: Concrete Grade 20Mpa ~ 30Mpa Join: None Installation Method: Drill & Cast‐In‐Situ
Pile Foundation
Pile Foundation
Pile Foundation
Pile Foundation
Pile Foundation
Pile Foundation
Pile Foundation
Pile Foundation
Bored Piles
Bored Piling Machine
Bored Piles
Drilling Equipment
Bored Piles
Lower Down Reinforcement
•Size: 100mm to 350mm Diameter •Lengths: Varies •Structural Capacity: 20 Ton to 250 Ton •Material: Grade 25 Mpa to 40 Mpa Grout M i l G d M M G
T 25 to T 40 as Reinforcement •Joint: None Joint None •Installation Method: Bored/Drill then Cast In Situ Bored/Drill then Cast‐In‐Situ Percussion then Cast‐In‐Situ Precast & Driven