×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

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!

*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

Microtunneling in sand and gravel and then into limestone

Microtunneling in sand and gravel and then into limestone

Microtunneling in sand and gravel and then into limestone

(OP)
Does any one know if a TBM or a MTBM can tunnel through sand and gravel with cobbles and boulders and then into lime stone, i.e., through an aluvial valley with bedrock on the other side?

RE: Microtunneling in sand and gravel and then into limestone

Duckman,

I've seen small TBM's work in alluvial deposits, but its difficult becuase its hard for the machine to keep the proper pressure in the tunnel walls to make it advance.

Also, when starting into bedrock, we usually are called to blast the initial opening to start the machine.

Frank

Frank Lucca
www.terradinamica.com

RE: Microtunneling in sand and gravel and then into limestone

It can be done, a major problem is preventing your TBM from "kicking" upward along the boundary rather than digging into the rock.

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


Resources

Taking Control of Engineering Documents
This ebook covers tips for creating and managing workflows, security best practices and protection of intellectual property, Cloud vs. on-premise software solutions, CAD file management, compliance, and more. Download Now
The Great Project Profitability Debate
A/E firms have a great opportunity to lead the world into the future, but the industry’s greatest asset—real-time data—is sitting wasted in clunky, archaic ERP platforms. Learn how real-time, fully interactive dashboards in a modern ERP allow you to unlock data that will shape the future of the world. 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