Designing of retaining walls, Civil Engineering

Assignment Help:

Question
What is function of shear keys in designing of retaining walls?

Answer
In formative external constancy of retaining walls, failure modes similar to bearing failure, sliding and overturning are usually considered in design. In considering criterion of sliding, sliding resistance of retaining walls is derived from base friction between wall base and foundation soils. To enlarge sliding conflict of retaining walls, rather than providing a large self-weight or a large retained soil mass, shear keys are to be installed at wall base. Opinion of shear keys is as follows-

Main purpose of installation of shear keys is to enhance an extra passive resistance industrial by height of shear keys. However, active pressure industrial by shear keys increases at the very same time. Success of shear keys lies in the information that enhance of passive pressure go over increase in active pressure, resulting in an improvement of sliding conflict.

On other hand, friction between wall base and foundation soils is usually about a fraction of an angle of interior resistance as in about 0.8φ where φ is an angle of inner friction of foundation soil. When a shear key is installed at base of the retaining wall, failure surface is changed from wall base or soil horizontal plane to a plane within foundation soil. Therefore, friction angle mobilized in this case is φ in its place of 0.8φ in earlier case and sliding resistance be capable of be enhanced.

 


Related Discussions:- Designing of retaining walls

Explain interim inspection - underwater inspection of bridge, Explain the I...

Explain the Interim inspection - underwater inspection of bridge An interim inspection is an inspection scheduled at the discretion of the engineer. An interim inspection is us

Define the process of eccentric prestressing, Define the proess of Eccentri...

Define the proess of Eccentric Prestressing In this form of prestressing, the centroid of cross-sectional areas of tendons is not located at the centroid of the cross-section.

Wires in gabion walls, Gabions are wire mesh boxes that are filled with sto...

Gabions are wire mesh boxes that are filled with stones and they areplaced in an orderly pattern to act as a single gravity retaining wall. Meshes or Lacing wires are designed t

Explain the shrinkage strain of concrete, Explain the shrinkage strain of c...

Explain the shrinkage strain of concrete Shrinkage of concrete depends only on the interval of time and the moisture conditions, but is independent of the stresses in the membe

State the procedure of prestressing, State the procedure of prestressing ...

State the procedure of prestressing When these wires cool down, concrete is poured in the moulds in which these tendons are provided in a stretched condition. Using this proces

Which type of pile cap transfers loads equally to piles, Q. Which type of p...

Q. Which type of pile cap transfers loads equally to piles, flexible pile cap orrigid pile cap? Loads from columns transferring to pile cap persuade tensile forces at the bott

Whole base of mat, Question In modeling a nonrigid mat foundation by us...

Question In modeling a nonrigid mat foundation by using elastic springs, have a uniform modulus of subgrade reaction be used along whole base of mat ? Answer A bed of

What is contact pressure, What is 'contact pressure'? How does it depend on...

What is 'contact pressure'? How does it depend on the type of structure and type of soil? What is 'active zone' in soil? Define it with reference to the pressure bulb concept.

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