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In _________ method, the soil under the existing footing is consolidated by using chemicals.

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In _________ method, the soil under the existing footing is consolidated by using chemicals.

(a) Chemical consolidation

(b) Freezing

(c) Cement grouting

(d) Vibroflotation

I have been asked this question by my college professor while I was bunking the class.

Query is from Underpinning and its Types in section Scaffolding, Shoring and Underpinning of Construction & Building Materials

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Correct choice is (a) Chemical consolidation

Best explanation: The procedure for chemical consolidation is as: The perforated pipe are driven in an inclined direction. The inclination slopes are so adjusted that the entire area under the existing putting comes under the command of the inclined pipes; The chemical reaction takes place between two chemicals and the soil is consolidated.

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