Labsheet Geo 1 - Mackintosh Probe

DCC30112 – GEOTECHNICAL AND HIGHWAY
ENGINEERING LABORATORY

MACKINTOSH
PROBE

CIVIL ENGINEERING DEPARTMENT

Course:
DCC 30112– GEOTECHNICAL AND HIGHWAY LABORATORY
Title:
MACKINTOSH PROBE

MACKINTOSH PROBE

OBJECTIVE
To determine the bearing capacity of soil.

APPARATUS:
1. Extension/boring rod 1.2 m length (10 Nos)
2. Rod coupling (10 Nos)
3. Driving head
4. Lifting/driving tool
5. Drop hammer
6. Measuring tape

PROCEDURE
1. Mark with each of the rod with distance of 0.3 m.
2. Join driving head at the end of boring rod.
3. Join drop hammer above of boring rod.
4. Place the rod at land and make sure the rod is straight
5. Raise and release 5kg drop hammer with specified height.
6. Record the number of blow every penetration of 0.3m. This test will end as if:

i. Had achieve its maximum blow
ii. Had achieve penetration of 12m

CIVIL ENGINEERING DEPARTMENT

Course:
DCC 30112– GEOTECHNICAL AND HIGHWAY LABORATORY

Title:
MACKINTOSH PROBE

LABORATORY TEST REPORT

Name Group
ID Number Date

RESULT AND CALCULATIONS:

Project Area : _____________________________
Date : _________________________

Depth (m) No. of blow/0.3m Cumulative no. of blow

0.0 – 0.3
0.3 – 0.6
0.6 – 0.9
0.9 – 1.2
1.2 – 1.5
1.5 – 1.8
1.8 – 2.1
2.1 – 2.4
2.4 – 2.7
2.7 – 3.0
3.0 – 3.3
3.3 – 3.6
3.6 – 3.9
3.9 – 4.2
4.2 – 4.5
4.5 – 4.8
4.8 – 5.1
5.1 – 5.4
5.4 – 5.7
5.7 – 6.0
6.0 – 6.3
6.3 – 6.6

CIVIL ENGINEERING DEPARTMENT

Course:
DCC 30112– GEOTECHNICAL AND HIGHWAY LABORATORY

Title:
MACKINTOSH PROBE

6.6 – 6.9
6.9 – 7.2
7.2 – 7.5
7.5 – 7.8
7.8 – 8.1
8.1 – 8.4
8.4 – 8.7
8.7 – 9.0
9.0 – 9.3
9.3 – 9.6
9.6 – 9.9
9.9 – 10.2
10.2 – 10.5
10.5 – 10.8
10.8 – 11.1
11.1 – 11.4
11.4 – 11.7
11.7 – 12.0

ANALYSIS:
1. Record number of blow for each 0.3m penetration.

2. Draw the graph of depth versus cumulative number of blow. From that graph, draw

cross sectional elevation of the soil (the section is based on change of gradient that

apparent on the plot)

3. Calculate number of blow/0.3m:

4. Number of blow = (Total of blow from A to B) / (Total of interval from A to B)

❖ Total of blow and interval is depend on the layer of soil

5. Determine the value of bearing capacity by referring to the graph of standard bearing

capacity versus number of blow/0.3m (APPENDIX).

CIVIL ENGINEERING DEPARTMENT

Course:
DCC 30112– GEOTECHNICAL AND HIGHWAY LABORATORY

Title:
MACKINTOSH PROBE

DISCUSSION:

CONCLUSION: Date:

REFERENCES:
Checked by:

CIVIL ENGINEERING DEPARTMENT

Course:
DCC 30112– GEOTECHNICAL AND HIGHWAY LABORATORY

Title:
MACKINTOSH PROBE

APPENDIX

Graph of Bearing Capacity versus No. of Blow/0.3m