Pile Load Test

1 INTRODUCTION
Bored cast in situ piles are to be constructed and tested at the location of Project
Management Building area of GHAVP-1&2 for validating the simulation/modelling
aspects of soil-pile interface behaviour.
2 SCOPE
The scope of work under this procedure covers the Conducting Low strain Pile integrity
test for all test piles.
1. Vertical Compression Pile Load test on one single pile.
3 APPLICABILITY
This document is applicable for testing of bored cast in situ RCC piles at the location of
Project Management Building area of GHAVP-1&2 Units.
4 INITIAL VERTICAL PILE LOAD TEST (STATIC)

4.1 Details of Test Set-up
Pile Test in compression will be carried out as per IS: 2911, Part-IV and details of test
set up is as under:
 The top of pile is chipped off and head of pile with fresh & richer concrete is
made true to horizontal plane. A rigid steel plate is placed on top of pile, under
hydraulic jack of 300 T capacity filled with a remote control pump/power pack
and duly calibration Pressure Gauge.
 Kentledge system for taking reaction shall be used which will be designed
using 25% extra load over and above test load.
4.2 Procedure / Method
1. The complete set up will be set at initial reading after application and release of a
small seating load.
2. Record of displacement/settlement against each stage of loading will be made from
all LVDTs. Readings shall be taken as per the loading sequence. Each stage of
loading will be maintained till rate of settlement is 0.1mm in first 30 minutes or 0.2
mm in first one hour or till two hour whichever occur first.
3. For application of load, a hydraulic jack of capacity as mentioned earlier (i.e. 300
T Capacity) with a remote control pump/power pack and duly calibrated pressure
gauge will be used.
4. Final load to be maintained for 24 hours and hourly/two hourly readings will be
taken. If the limit of permissible displacement as given in point no. 2 is not
exceeded, testing of pile is not required to be continued further.
5. The load will then be released to zero in stages and rebound observation will be
recorded and plots of load Vs settlement curve for individual loads will be prepared.
Figure 1 Kentledge load arrangement (Typical)

Calculation of Dead Load:-
1. Pile Dia = 600 mm.
2. Pile Depth = 18 m below cut-off level (C.O.L).
3. Test Load = 89.55 T
4. Kentledge load = 1.25 x Test Load = 1.25 x 89.55 = 111.93 MT.
5. Avg. Size of Platform: 6 X 6 = 36 m²
6. Used concrete block weight = 2 MT/ block
7. Total dead load of concrete blocks (55 x 2) 110 MT.
8. Weight of one built-up section of ISMB (300mm) =46 x 6=276 kg i.e. .276 MT
9. Weight of 9 built-up section of ISMB (300mm) =.276 x 9= 2.484 MT
10. 500 mm built-up ISMB weight = 6 x 86.9= 521.4 kg i.e. .521 MT
11. Weight of 9 built-up section of ISMB (500mm)= 2 x .521 = 1.042MT
12. Plan area of platform = 6 x6 = 36 m2.
13. MS Plate Load (40 Kg/m2) = 1.44 MT.
14. Total Dead Load approx. = 115 MT
LVDT
Hydraulic Jacks
Test plate on pile head
LVDT
Datum Bars
Pile Head
D/Fixing Supports
Table 1: Loading details
Pile dia. Pile length Kentledge Reaction

Loading Pattern (mm) (m) load System
Initial Pile Load 600 18 111 Kentledge

Test system
(compression)
4.3 Load Application Details of Initial Vertical Pile Test:
 Application details of Initial Load Test :

Dia of Ram of Hydraulic Jack : 260mm
Area of Ram of Hydraulic Jack (π/4 x d²) : 530.66 Cm²

Least count of Pressure Gauge(1-Div) : 10 Kg/ Cm²
Load applied against 1 Division : 530.66 x 10 ÷ 1000 = 5.306 MT
Each increment shall be 3 Div. by P/Gauge: 3 x 5.306 MT = 15.918 MT.
Load increments on the pile will be as per Table 4.

Table 2: Load Increment Steps for Vertical Pile Load Test
Description Pressure gauge reading Load Applied
(In Kg/Cm²) (In MTon)

Loading cycle
Loading cycle
Loading cycle
Loading cycle
Loading cycle
Loading cycle
Loading cycle
Loading cycle
Loading cycle
Loading cycle
Loading cycle
Loading cycle
Loading cycle
Loading cycle
Loading cycle
Unloading Cycle
4.4 Results:
The results of the displacement measurements shall be recorded and presented in graphical
form as a Load vs. Displacement plot. Adequate provision of photography and videography
shall be made as a part of documentation process. It should cover the entire process starting
from excavation/boring, construction and final testing.

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What is the scope of work covered in this procedure?

What tests will be conducted on the piles?

1 INTRODUCTION

4 INITIAL VERTICAL PILE LOAD TEST (STATIC)

4.2 Procedure / Method

Figure 1 Kentledge load arrangement (Typical)

Test plate on pile head

Table 1: Loading details

Pile dia. Pile length Kentledge Reaction

Initial Pile Load 600 18 111 Kentledge

4.3 Load Application Details of Initial Vertical Pile Test:

 Application details of Initial Load Test :

Area of Ram of Hydraulic Jack (π/4 x d²) : 530.66 Cm²

Load applied against 1 Division : 530.66 x 10 ÷ 1000 = 5.306 MT

Each increment shall be 3 Div. by P/Gauge: 3 x 5.306 MT = 15.918 MT.

Load increments on the pile will be as per Table 4.

(In Kg/Cm²) (In MTon)

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