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Civil Engineering Q&A 3

Piles, Soils, and shoring QUESTIONS:

1- Types Of shoring:

a- Soldier Pile walls or H & I Beams

b- Secant piles

c- Contiguous pile

d- Sheet piles

e- Diaphragm walls

2- What is the test of piles?

a- Dynamic load test

b- Static load test

c- Pile integrity test

3- Soldier pile shoring system without tie anchors con be used when excavation

depth doesn’t exceed a distance of:

5 meters

4- Difference between secant & contiguous shoring system:

Contiguous pile has a tiny space between piles mostly filled with earth or it can be

grouted. Main used when we don’t have water and soil is stiff and cohesive.

Secant pile doesn’t have gape restrain of water don’t allow seepage use for losing

sand

5- Percentage of pile should be test by static load test is:

1%

6- Minimum diameter of Micro pile

Diameter range between 125mm to 300 mm

7- The level of shoring RC piles for the road should be below GL by:

2 meters

8- Splicing length of piles is:

50 D

9- Percentage of minimum steel provided in compaction pile is

1%

10- Ultrasonic pulse velocity test done for pile of diameter of:

1200 mm

11- Materials used between H beam shoring are:

a- Wood

b- Steel

c- Precast concrete panel

 

 

12- Minimum cover for pile is:

75 mm

13- Minimum depth of pile head inside pile cap is:

50 mm

14- In secant piles minimum overlap is:

150 mm

15- Grade of steel of H beam shoring system is:

S275 & S355

16- Maximum allowable deviation on shoring sides under max loading in case that

road edge is 5 m away is:

30 mm

17- Maximum allowable deviation on shoring side where there are no services

surrounding is:

50 mm

18- If the liquefiable sand layer has a fines content less than 10%, the following

densification technique is the most suitable on:

Vibro compaction

19- For loose to medium sand, the bulk density and the submerged density

corresponding are:

1.6 Mg/m3 and 0.6 Mg/ m3

Or 1600 kg/m3 and 600 kg/m3

20- Minimum distance dipped in the hard strata for pile toe level should be at least

2 D

21- % Of pile to be tested by sonic test is:

10% and 100 % integrity test

22- In offshore projects, piles can be driven to a max of:

150 meters

23- The diameter of spiral stirrups in pile is:

10 mm

24- Maximum acceptable settlement for the piles under working load is:

8mm

25- Minimum distance between anchors is:

Minimum 1.2 meter

26- Maximum length of anchors is:

Max 10 meters

27- Minimum factor safety for piles is

Minimum 2.5

28- Types of foundation:








29- Minimum reinforcement for deep pile foundation:


 

 

 

 

 

 

30- Design criteria for shoring: