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If the cohesive backfill carries a surcharge of q per unit area, then the lateral pressure is increased by _________

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in Geotechnical Engineering II by (93.7k points)
If the cohesive backfill carries a surcharge of q per unit area, then the lateral pressure is increased by _________

(a) Ka q

(b) q

(c) Ka

(d) Ka/q

The question was asked in my homework.

This intriguing question comes from Active Earth Pressure of Cohesive Soils topic in section Failure Envelopes & Earth Pressure of Geotechnical Engineering II

1 Answer

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by (243k points)
Right option is (a) Ka q

To elaborate: Since the surcharge is the additional load, when the backfill is horizontal and carries a surcharge q, then the vertical pressure increment will be by q. Due to this, the lateral pressure will increase by Ka q.

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