Seoul blasts through a granite mountain pass Nov 2011
Sandvik News Release
Excavation has started on a 5km highway tunnel through a granite mountain overlooking Seoul in South Korea.
  • Seoul, from the Gwanaksan granite mountain top

    Seoul, from the Gwanaksan granite mountain top

  • Sandvik DTi jumbo prepares a topheading round

    Sandvik DTi jumbo prepares a topheading round

Specialist rock tunnelling contractor Taeah is using drill+blast to excavate almost half the length of the twin tube tunnel on the 12.4km stretch of six-lane highway between the Geumcheon technology business district and the upmarket residential district of Seocho on the southern side of the South Korean capital.
The highway, known as the Kangnam Beltway, needs to pass through the Gwanaksan mountain, a 632m-high granite formation whose name in Korean means "hat-shaped peak". The mountain itself is a tourist magnet, and its slopes are home to the Buddhist hermitage of Yeonjuam and the dramatic Yeonjudae, a Buddhist hall perched on a granite cliff.

Project Manager Seong-su Kim

Taeah Project Manager Seong-su Kim reported that since tunnelling started from in front of the main campus of Seoul University in July, excavation on the company's 2.4km contracted share of the tunnel had progressed by 338m by October.
After encountering all five grades of rock initially ranging from Type I hard granite through to Type V granite/soil mix, Kim said that only Types I and II were blasted during 175m of excavation in September.
Taeah is using a Sandvik DTi jumbo with three booms that can cover a face ranging from 20-203m2. The rig is fitted with Sandvik's new tunnel planning software, iSure. The system offers a way of simultaneously working with optimised drilling and blasting patterns to reduce the need for scaling, increase rock loadability for mucking, and ensure smoother collaring in the following round.
The main tunnel is 20m wide x 10m high, with a shorter stretch of 14m x 9m, and is being advanced on a topheading and bench cycle. Charge hole diameter is the standard Korean specification of 45mm. During summer six blasts a day are being carried out, although this is expected to reduce to four or five in the winter.
The Sandvik jumbo is operating 24 hours a day, to drill face charge holes in each of the twin tubes alternately. The complete highway contract is being carried out for Kangnam Beltway and is scheduled for completion in May 2013.
  • Scope of the project

    Scope of the project

  • Seoul University portal

    Seoul University portal

  • Jumbo at fully extended reach

    Jumbo at fully extended reach


           

Add your comment

Thank you for taking the time to share your thoughts and comments. You share in the wider tunnelling community, so please keep your comments smart and civil. Don't attack other readers personally, and keep your language professional.
In case of an error submitting Feedback, copy and send the text to Feedback@TunnelTalk.com
Name :

Date :

Email :

Phone No :

   Security Image Refresh
Enter the security code :
No spaces, case-sensitive
 
 

TBM

Tunnel

Tunnelling

Boring

Conveyor

Cutterhead

Cut and cover

Tunnel Boring Machine

Double shield

Drill and blast

EPB

Earth Pressure Balance machine

reinforced fibre

Geotechnical engineering

EPBM

Headrace

Immersed tube

Jet-grouting

NATM

Over-excavation

One-pass lining

Pipe jacking

Road header

Rock bolt

Secondary lining

Underground

tunnel jobs

natm

tunnel excavations

tunnel boring

shaft sinking

tunnel mining

Diary Dates

Career Moves

Accolades

Procurement

Equipment Sales
Tunnel Directory
Tunnel Events
Tunnelling Events
TunnelCast
TunnelCast Videos
Tunnelling news
Tunnel Articles
World news
Used Tunnelling Equipments
TBM PLC
Tunnel News
Tunnel articles
Tunnelling articles
Tunnelling magazine
Tunnel Magazine