Differences between open shield and closed shield, Civil Engineering

Assignment Help:

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.


Related Discussions:- Differences between open shield and closed shield

State the coulomb earth pressure theory, A masonry wall with vertical back ...

A masonry wall with vertical back has a backfill 5 m behind it. The ground level is horizontal at the top and the ground water table is at ground level. Measured the horizontal pre

Reason of skin reinforcement for deep beams, Question What is reason of sk...

Question What is reason of skin reinforcement for deep beams ? Answer In BS8110, it declares that secondary reinforcement have to be provided for beams greater than 750mm deep

Geofabric strengthening of perth soils, I need technical assistance. The pr...

I need technical assistance. The project is incomplete. I need someone to proofread it. Do you have someone who know Plaxis, Slope/W and Flac?. Can you arrange a case study for Geo

Mechanics, What is the parallelogram law of force and prove it?

What is the parallelogram law of force and prove it?

What is the density index of the natural soil, A sand at a borrow pit is de...

A sand at a borrow pit is determined to have an  in-situ dry unit weight of 18.4 kN/m 3 . Laboratory tests indicate the maximum and  minimum unit weight values of 19.6 kN/m 3 and

Calculate the total board feet, A project engineer has ordered 100 hardwood...

A project engineer has ordered 100 hardwood boards, 1-1/4-in thick by 8-in wide and 8-ft long.  The total board feet ordered is most nearly:  Solution: 1.25" x 8" x 8' x 100

Compute the negative skin friction of the pile group, A square pile group o...

A square pile group of 9 piles passes by a recently filled up material of 4.5 m depth. The diameter of the pile is 30 cm and pile spacing is 90 cm centre to centre. If the unconfin

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd