Question

Compute the effective vertical stress at point A. (15 Points) 5 FT Silty Sand (SM) y= 105 lb/ft3 Well Graded Sand (SW) y= 115 lb/ft3 8 FT. + 11FT 12 FT A. 5 FT Silty Gravel (GM) y= 125 lb/ft3 Figure #1

need help solving this peoblem i can seem to be a le to figure it ... thank you in asvance

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Answer 1

Solution is attached in the image posted below.

As there is no particular data to fins the unit weight of top 1 ft of silty gravel we have taken its unit weight equal to that mentioned for whole.

Effective stuess = Total suess - pore watee Pressue wara table is available in siltly Gravel layer hence pore water press we will only be at that paut. 5. You • Y Sux Hom & YSN HSN & Yamx 1 &amxs yoxs 112501 + 125 x5-62.4x5] => 105 x5 + 1158 2) 1883 lb/ft? I for depth of top ift of silty Gravel Generally the unit weight of soil will be cliboeient as it is not saturated or say it is above water table. But as there renit wiegnt is commonly Mentioned lesiblft3 we have used that as there is no alata to calcolate unit wieght of that aft Region] 1 lm T=YIMIT Y2 H2 + 13H3 fumy - Yo Hy] 12 H2 As there is no scope of finding y taking 13=yu. Y3 1 H3 oft yu Inu