Tel: 1-206-279-3300

2-Day Deep Excavation and Soil nail wall design Workshop

16 PDH @ Plano, TX

Sep 30, Oct 1st, 2019

Only 5 spots left!

Renaissance Hotel, Legacy West

Renaissance Hotel Plano Legacy West

Early registration ends soon!

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Our Software Solutions
DeepFND 2020: Deep Foundation software (NEW: Pile-Group/Pile Raft Analysis!)
DeepEX 2019: Deep Excavation software
Soldier pile walls
Sheet pile walls
Secant pile Walls
Tangent piles
Diaphragm Walls
Soldier and Tremied Concrete
Soil Mix walls
Combined king pile sheet piles
Slope stability
Cost estimation for braced excavations
Waler-Strut Cofferdams
Snail-Plus 2019: Soil nailing - soil nailing walls
SiteMaster: Inclinometer software (adopted by Geokon)
HelixPile: Helical Pile Software
RC-Solver: Concrete Design ACI-318, EC2, EC8
Steel-Beam: Steel beam column design, full equations, AISC, EC3

SECANT PILE WALL DESIGN - SECANT PILES FOR DEEP EXCAVATIONS

Secant pile walls are formed by constructing intersecting reinforced concrete piles. The piles are reinforced with either steel rebar or with steel beams and are constructed by drilling under mud. Primary piles are installed first with secondary piles constructed in between primary piles once the latter gain sufficient strength. Pile overlap is typically in the order of 3 inches (8 cm). In a tangent pile wall, there is no pile overlap as the piles are constructed flush to each other. The main advantages of secant or tangent pile walls are:

1. Increased construction alignment flexibility.

2. Increased wall stiffness compared to sheet piles.

3. Can be installed in difficult ground (cobbles/boulders).

4. Less noisy construction.

5. No need to install timber lagging.

The main disadvantages of secant pile walls are:

1. Verticality tolerances may be hard to achieve for deep piles.

2. Total waterproofing is very difficult to obtain in joints.

3. Increased cost compared to sheet pile walls.

Secant pile wall types, secant piles with I beams, secant piles with reinforced concrete

Above: Secant pile wall types, all included in our DeepEX deep excavation software

Secant pile wall sections

Secant pile wall section drawing in DeepEX

Selecting the appropriate secant pile wall depends mostly on local practice, material, and installation costs. In the US, secant piles are commonly reinforced with steel I or W beams. In Europe and South America, where labor costs are smaller, reinforced concrete secant pile walls are commonly used. Occassionaly, some designs opt to have two or three unreinforced secant piles in between the reinforced piles.

Secant pile wall excavation designed with DeepEX software for Dodulu Subway Line in Instabul, Turkey

Above: Secant pile wall excavation with struts for the Dodulu Subway Station in Instabul, Turkey, designed with our DeepEX software.

Secant pile design in deep excavation software and sample secant pile section drawing

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TANGENT PILE WALL DESIGN - TANGENT PILES FOR DEEP EXCAVATIONS

Tangent pile walls, in contrast to secant pile walls do not interesect. As a result, all tangent piles need to be reinforced. With tangent pile walls, it is common to create a pile cap so that a more homogenous behavior can be achieved.

1. Increased construction alignment flexibility.

2. Increased wall stiffness compared to sheet piles.

3. Can be installed in difficult ground (cobbles/boulders).

4. Less noisy construction.

5. No need to install timber lagging.

6. No need to create an overlap as required with secant piles.

The main disadvantages of tangent pile walls are:

1. Verticality tolerances may be hard to achieve for deep piles.

2. Walls are not waterproof

3. Tangent piles cannot share load with adjacent pile

4. Soil must be able to span in between any small openings between the piles. As a result tangent piles are not recommended for cohesionless sand soils.

Cutter soil mix secant pile wall in Seattle with DeepEX

1. Check out the analysis of a cutter soil mix secant pile wall in downtown Seattle with DeepEX

Soldier pile excavation for Los Angeles Subways Designed with DeepEX software

2. See the 100ft soldier pile excavation case history for the Los Angeles Subway designed with DeepEX

Circular Secant Pile Shaft in Florida designed with DeepEX by Hayward Baker

3. DeepEX is a deep excavation expert by your side. Use your voice to model, find out how..

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