Go Vertical with Confidence®

Foundation Systems and Services

Farrell recommends, designs and installs Ground Improvement and Deep Foundation solutions that are best suited for the given site, soil, groundwater, and proposed structure condition. We also offer foundation peer review and specialty design services.  Our proven foundation systems are shown below.

 

Depth Limit

DDP

85 ft ( 26 m)

DDC

80 ft (24 m)

RAP

25 ft (8 m)

IRAP

40 ft (12 m)

RIC

20 ft (6 m)

HMP

100 ft (27 m)

Compatible Soils

DDP

Sand (SP, SM, SC)

Silt (ML, MH)

Clay (CL, CH)

Contaminated Soil

Undocumented Fill

DDC

Contaminated Soil

Sand (SP, SM, SP)

Silt (ML, MH)

Clay (CL, CH)

Undocumented Fill

RAP

Silt (ML, MH)

Clay (CL, CH)

Clayey Sand (SC)

Silty Sand (SM)

Undocumented Fill

IRAP

Silt (ML)

Clayey Sand (SC)

Silty Sand (SM)

Poorly Graded Sand (SP)

RIC

Sand (SP, SM, SC)

Silt (ML, MH)

Undocumented Fill

Contaminated Soil

HMP

Sand (SP, SM, SC)

Silt (ML, MH)

Clay (CL, CH)

Contaminated Soil

Undocumented Fill

 

Bearing Capacity Range (ASD)

DDP

100 kips
(445 kN)

to

500 kips
(2224 kN)

DDC

4,000 psf
(192 kpa)

to

10,000 psf
(479 kpa)

RAP

5,000 psf
(239 kpa)

to

9,000 psf
(431 kpa)

IRAP

3,000 psf
(144 kpa)

to

6,000 psf
(287 kpa)

RIC

2,000 psf
(96 kpa)

to

8,000 psf
(383 kpa)

HMP

20 kips
(89 kN)

to

200 kips
(890 kN)

Key Advantages

DDP

Deep pile with ground improvement

No vibration

Low spoil

High capacity

16" 18" 24" diameter

Steel reinforcement

DDC

Very high stiffness

No vibration

Low spoil

High capacity

Well defined concrete column

Liquefaction mitigation

Uplift-hold-down

RAP

Cost effective support

Readily available material

LEED opportunity

High bearing capacity

Uplift-tension hold-down

IRAP

Liquefaction mitigation

No casing

Low spoils

High stiffness

Densification

RIC

Highly cost effective

Liquefaction mitigation

Fast improvement process

No spoils

Densification

HMP

Small equipment for tight access

Ideal for repair/retrofit

Minimal site impact

No spoils

No vibrations

 

Key Considerations

DDP

Deep pile

Grout with low spoil

Concrete cleanup

Flat stable pad

Pile connections

DDC

Impermeable

Grout with low spoil

Concrete cleanup

Flat stable pad

Gravel cushion

RAP

Vibration system & Low noise

High spoil haul-off

Casing at high ground water sand

Moderate depth limit

IRAP

Vibration system & Low noise

Soft clay requires grout

Not good for small site

No work next to buildings

RIC

Pad grading required

Vibrations within
30 ft

Shallow depth limit

High noise

HMP

High material cost

Steel below water

Weld splice for SPP

 

Comparable To

DDP

Concrete piers

Driven piles

Stone columns

Soil-cement columns

Torque piers

DDC

Concrete piers

Driven piles

Stone columns

Soil-cement columns

Franki piers

RAP

Overex/replace

Concrete piers

Driven piles

Stone columns

Soil-cement columns

IRAP

Overex/replace

Concrete piers

Driven piles

Stone columns

Soil-cement columns

RIC

Deep dynamic compaction

Overex/replace

Stone columns

HMP

Micro-piles

Soil-nails

Concrete piers

Driven piles

Geopier, Impact, and Rammed Aggregate Pier are registered trademarks of Geopier Foundation Company, Inc.

Geopier systems by Farrell offered in Northern California.

Drill Displacement Column is the trademark of Farrell Design-Build Inc.

Farrell Design-Build Inc.  |   Sacramento  530.621.4867   |   Irvine  949.428.9596

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