Differences between open shield and closed shield, Civil Engineering

Q. Differences between open shield and closed shield?

Open shield type TBM refers to those providing lateral support only. They can be further classified into single shield and double shield.  

Closed shield type TBM refers to those providing lateral support and frontal support. Some common TBM method under this category includes compressed air TBM, slurry shield TBM, earth pressure balance machine and mixed confinement shield. 

Compressed air TBM is suitable for cohesive soils under water table (e.g. ground with low permeability with no major discontinuities). Slurry shield TBM is suitable for soft ground and soft rock under water table and also for ground for high permeability. Earth pressure balance machine is suitable for soft ground and soft rock under water table. It is not recommended for very abrasive and hard ground.

Posted Date: 8/8/2013 4:11:25 AM | Location : United States







Related Discussions:- Differences between open shield and closed shield, Assignment Help, Ask Question on Differences between open shield and closed shield, Get Answer, Expert's Help, Differences between open shield and closed shield Discussions

Write discussion on Differences between open shield and closed shield
Your posts are moderated
Related Questions
Define the Combustion of Solid Waste? A chemical reaction in which the elements in fuel oxidize in presence of excess oxygen C → CO 2 , H → H 2 O, S   → SO x , N → NO x

The Morison equation vs. diffraction analysis in determining wave force on piles The choice between Morison's equation and diffraction analysis in determining the wave forces o

How to prove that heat and work are the path functions?

A cantilever beam is loaded with a concentrated. Force of 5kN at the free end. The length of the cantilever beam is 1m having cross section of 50×50mm. determine the equation for b

Crushing Strength Test: For conducting this test, specimen of size 40 × 40 × 40 mm is build from parent stone. Then finely the sides are dressed and placed in water for thr

what is the type of slope protection that use rocks and put cements between those rocks??the concept is same as brick layer

Q. Effects of sewer sediment on hydraulic performance? The presence of sediment in sewers has contrary effects on the hydraulic performance of sewers. In case of sewage flow ca


Q.What do you mean by Slip Siding? If the Station yard is in a gradient steeper than 1 in 260 or there is a continuous falling gradient away from the station there is a possibi

Explain the National Primary Drinking Water Standards Safe Drinking Water Act (SDWA, 1974) required EPA to establish maximum contaminant levels (MCLs) for public water systems