piles in sand
Type Coursework
Level University
Style Harvard
Sources 4
Language English(U.K.)
Description
Piles in Sand – Coursework Detail
General
The apparatus consists of a large sand tank with a steel template held in a frame above the sand surface. The template has 13 symmetrically placed holes through which 9 steel piles are driven into the sand in a pre-selected pattern. The piles are driven using a small hand powered pile driver. A loading plate can be attached to an individual pile enabling it to be loaded to failure. It is also possible to measure the resistance of each pile as it is pulled out of the soil.
The resistance to driving can be measured for each pile in the group and the densifying effect of driving piled in sand can be demonstrated. Load/ settlement curves can be drawn and relationships can be analysed between penetration resistance, pull-out resistance, load bearing, settlement and pile group behaviour.
. All symbols have usual meanings.

Procedure
1. Remove or loosen sand to a depth of 450mm. Replace and or compact the sand to a uniform density.
2. Place the pile guide plate in the frame of the sand tank and select the order and pattern in which the piles are to be driven. (Give reasons for your choice).
3. Drive each one of the nine piles to the set length using the dynamic driving system and record the blow count per 25mm of penetration.
4. Select three piles for load testing and load test each of these piles using the following procedure.
5. Attached the load plate on top of the pile and set up the dial gauge.
6. Apply load in increments to the pile until failure conditions are reached ie settlement becomes excessive in relation to the increase in load.
7. For each load increment record the pile head displacement
8. After completion of the load tests pull out each of the nine piles using the pull out system provided and record the maximum pull out force for each of the piles.

Tasks
1. Produce a report which will include the following.
2. Produce a graph of blow count verses penetration for each of the piles.
3. Plot a graph of settlement verses pressure and evaluate the failure load for each of the three piles load tested.
4. Compare the failure load to that determined using the bearing capacity formula.
5. Inspect the relative performance of each pile in terms of load and settlement.
6. Compare pull out forces.
7. Design a square driven pile to carry a working load of X kN

First letter of first name 1000kN 1500kN 2000kN 2500kN
A-E √
F-M √
N–Q √
R-Z √
Table -Pile Loads