Geotechnical Engineering Quiz Part 4 – Pile Foundation

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In designing foundation for a high rise building Or structure with significantly high loading, the raft is assumed to be flexible

True

False

While designing a foundation for a high rise structure differential settlement must be taken care of. This differential settlement is due to

Excessive vertical loading of the structure

Lateral load due to wind forces

Difference in loading of foundation due to podium structures surrounding the main structure

Due to excessive depth of the foundations required

In a pile raft composite system

Pile carry the entire foundation load

Foundations loads are carried by raft only and the piles provide stability

Pile and Raft carry the designed share of foundation loads

Pile carry the entire foundation load and the raft carry only the floor load

For high rise structures raft foundations can be used when

The building has multiple basements and a hard a hard strata beneat the last basement

Hard rock is available at a shallow depth

Water table is close to ground surface

Hard strata is available at a very deep level

For a horizontal acceleration of a high rise building of 0.05 to 0.1 m2/s the human perception level is

Human cannot perceive motion

Most people perceive motion

Only sensitive people can perceive motion and objects may move slightly

People strongly perceive motion and have difficulty walking

Which of the following statemets regarding Raft Pile composite foundation is/are false

Piles of different diameters can be used

It can be comparatively economical then a pile foundation

Piles can be of different lengths

Raft thickness should be uniform

The value of pile interaction factor

Decreases with increase in pile spacing

Increase with increase of pile diameter

Increase with increase in pile spacing

Decreases with bearing capacity of soil

For adequate load dispersion spacing of piles should be a minimum of

D = diameter of pile
B = width of pile group

2D c/c

3D c/c

B/2 Or 300mm

B/2

For durability of a foundation structure where groundwater contains excessive sulphates and chlorides measures adopted are

Giving extra cover to the foundation

Increasing the steel grade to fe500

Providing a special waterproofing system

Using high alumina cement for foundation construction

10.

Foundations for high rise structures are generally designed to carry

Vertical loads only

Vertical loads and moments due to eccentricity

Vertical loads, moments, horizontal loads and cyclic loads due to winds

Vertical loads, horizontal loads and bending

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