Standard Penetration Test Equipment

SOIL

The test consists of driving a standard 50-mm outside diameter thickwalled sampler into soil at the bottom of a borehole, using repeated blows of a 63.5 kg hammer falling through 760 mm. The SPT N value is the number of blows required to achieve a penetration of 300 mm, after an initial seating drive of 150 mm.

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The requirements to conduct SPT are:

1. Standard Split Spoon Sampler

2. Drop Hammer weighing 63.5kg

3. Guiding rod

4. Drilling Rig.

5. Driving head (anvil).

Precautions taken for Standard Penetration Test

1. Split spoon sampler must be in good condition.

2. The cutting shoe must be free from wear and tear

3. The height of fall must be 750mm. Any change from this will affect the ‘N’ value.

4. The drill rods used must be in standard condition. Bent drill rods are not used.

5. Before conducting the test, the bottom of the borehole must be cleaned.

Product: Standard Penetration Test Equipment

Standard Penetration Test Equipment

SOIL

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