Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Soldier Pile Walls - Australian Practice (Melbourne)

Soldier Pile Walls - Australian Practice (Melbourne)

Soldier Pile Walls - Australian Practice (Melbourne)

I am writing this thread from Africa and have seen that Multi-anchored Soldier Piles (Concrete and shotcrete lagging) are used extensively in places such as Melbourne.

I have a few questions and was hoping someone from there would be so kind to respond:

- AS4678 does not provide clarification on how you should look at the required anchor forces (Assuming we are using LE methods). Do you use equivalent earth pressures(Terzaghi and Peck or FHWA?) and specify anchors with similar tieback forces and structural capacity with increase in depth? I assume this is then checked in FE or with Beam on Elastic Methods to confirm the requirement?
- Do you use equivalent earth pressures to derived Bending Moments in the piles or other methods? And then check these in FE or BOE?
- Do you use post injection grouting to increase the bond strength of the ground anchors?
- I see you also leave gaps in your shotcrete lagging, why don't you just but the permanent slabs up against the wall? What is the reasoning behind tieing the slab to the wall?
- Do you have high ground watertables and do you dewater site or wont you use Soldier Piles in such cases?
- Why the need for a capping beam before you excavate? We normally only construct this once we reach the ground slab?

Thanks so much


RE: Soldier Pile Walls - Australian Practice (Melbourne)

Generally I would use software like WALLAP to calculate the anchor forces and pile bending moments.

We would dewater the site if feasible but it depends a lot on the ground conditions. With a high water table in sands we would probably use a secant pile wall.

I've seen the capping beam done both ways. But installing it before the dig gives the wall more robustness in case of an anchor failure. Also, walls are often braced at capping beam level with props rather than using ground anchors.

RE: Soldier Pile Walls - Australian Practice (Melbourne)

Here's the structural engineer take on soldier pile wall design in AU:
- the walls will be analyzed using software capable to perform staged analysis, such as FREW, WALLAP or Plaxis, which will calculate earth pressures and pile/tieback forces. FHWA final earth pressure diagrams typically are not used even for preliminary design.
- pressure grouting of anchors will be used to decrease the bonding length
- shotcrete lagging is economical and therefore preferable, allows fast excavation. It will be used if soil standup time and ground water conditions allow. Fascia wall will be built later. Different methods will be used in more difficult conditions, like ground water in non-cohesive soils.
- It's easy to construct capping beam on grade rather than using falsework (at least on excavated side). Also, it ensures that piles deflect together and share loads while excavation could be quite uneven.

I may missed a bunch of valid points, it's been 10 years ago when I worked in AU.


Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members! Already a Member? Login


White Paper - The New World of Thermoplastic Manufacturing
Digital-direct thermoplastic manufacturing offers exceptional quality, opens the door to novel design parameters not possible with injection molding while also bypassing the long lead time and up-front investment in injection molding tooling, offering a better total value proposition. Download Now
White Paper - Strategies to Secure Connected Cars with Firewalls
White-hat hackers have demonstrated gaining remote access to dashboard functions and transmissions of connected vehicles. That makes a firewall a vital component of a multilayered approach to vehicle security as well as overall vehicle safety and reliability. Learn strategies to secure with firewalls. Download Now
White Paper - Model Based Engineering for Wire Harness Manufacturing
As complexity rises, current harness manufacturing methods are struggling to keep pace due to manual data exchanges and the inability to capture tribal knowledge. A model-based wire harness manufacturing engineering flow automates data exchange and captures tribal knowledge through design rules to help harness manufacturers improve harness quality and boost efficiency. Download Now
White Paper - What is Generative Design and Why Do You Need It?
Engineers are being asked to produce more sophisticated designs under a perfect storm of complexity, cost, and change management pressures. Generative design empowers automotive design teams to navigate this storm by employing automation, data re-use and synchronization, and framing design in the context of a full vehicle platform. Download Now

Close Box

Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close