DETERMINATION OF CONSOLIDATION PROPERTIES OF SOIL | Learning Technology

By | July 12, 2017

DETERMINATION OF CONSOLIDATION PROPERTIES OF SOIL

OBJECT OF EXPERIMENT


DETERMINATION OF CONSOLIDATION PROPERTIES OF SOIL

 

STANDARD REFERENCE


IS 2720 (Part – 15 – 1965)

 

PURPOSE


This test is performed to determine the magnitude and rate of volume decrease that a laterally confined soil specimen undergoes when subjected to different vertical pressure. The data obtained can also be used to determine the coefficient of consolidation and the coefficient of secondary compression of the soil.

 

APPARATUS


Consolidation cell, Ring, Porous stones, Loading frame and dial gauge, Trimming tools, Balance, Filter paper, Stopwatch, Apparatus for moisture content determination.

 

PROCEDURE


1. Clean the consolidation ring and measure its inside diameter, height and weight.

2. Press the ring gently into the undisturbed soil sample until soil projects above the top of the ring, lift it up with extreme care, and trim the soil surfaces to flush both at the top and bottom of the ring. Remove any excess soil sticking outside, and weigh the specimen with ring. Take samples from the remaining soil mass for determination of initial water content.

3. Place soaked porous stones on the top and bottom surfaces of the soil specimen with filter paper discs in between. Press lightly to ensure that the stones adhere to the specimen.

4. Assemble the specimen carefully into the consolidation cell, mount the cell on the loading frame, and set the dial gauge. Connect the system to a water Reservoir, and allow the water to flow into till the specimen is completely covered and saturated.

5. Adjust and record initial dial gauge reading. Apply normal load to give a pressure intensity of 1.0 Kg/cmon the soil specimen.

6. Note the dial gauge readings at elapsed times of 0, 1/4, 1/2, 1, 2, 4, 8, 15, 30, 60 minutes etc. up to 24 hours.

7. After recording the final time and dial reading, siphon water out of the consolidation cell, release the load, quickly disassemble the cell, remove the ring, and blot the specimen surfaces dry with paper.

8. Weigh the specimen with ring, and place in the oven for determination of final water content.

 

OBSERVATIONS AND CALCULATIONS


Diameter of ring (mm) =

Area of ring (mm2), A =

Height of ring (mm), H =

BEFORE TEST

Mass of ring + wet soil (gm) =

Initial moisture content (%), Wi =

Initial height of specimen (mm), Hi =

AFTER TEST

Mass of ring + wet soil (gm) =

Mass of dry soil (gm), Ws =

Final moisture content (%), Wf =

Total change in height (mm) =

Final height of specimen (mm), Hf =

DATE

START TIME

Pressure Intensity (kg/cm2)

Elapsed time (t), (min)

0

¼

½

1

2

4

8

15

30

60

24 hrs

 

CALCULATION


Square Root Of Time Fitting Method From Graph

Time corresponding to 90 % consolidation, t90 =

Hence the coefficient of consolidation, Cv = 0.848H2/t90 = ……….. cm2/min

 

REMARKS


Finally, Write your own experience from experiment.

 

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