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In vacuum method, the top of bore hole is sealed by __________

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in Geotechnical Engineering I by (102k points)
In vacuum method, the top of bore hole is sealed by __________

(a) soil cement

(b) bentonite

(c) clay

(d) soil cement, bentonite and clay

The question was posed to me during an online exam.

I want to ask this question from Drainage and Dewatering in chapter Drainage and Dewatering of Geotechnical Engineering I

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Right answer is (d) soil cement, bentonite and clay

For explanation: The coarse sand is shovelled into the hole to fill upto about 0.75m to 1m from the top.  The top portion of the bore hole is sealed up by tamping soil cement, bentonite or clay.

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