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How do horizontal drains help to stabilize slopes?

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The use of horizontal drains to enhance slope stability in the following ways:

(i) It enhances an increase in soil strength by lowering the degree of saturation of soils.

(ii) It reduces the pore water pressure in the region of potential slip surface.

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(iii) It hinders the development of seepage forces.

This question is taken from book named – A Self Learning Manual – Mastering Different Fields of Civil Engineering Works (VC-Q-A-Method) by Vincent T. H. CHU.

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