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A saturated clay layer 5m thick is overlain by sand layer 3m deep. Consider the water table to be present at a depth of 2m below the ground level or surface. If 2m deep sand layer of Bulk unit weight 20 kN/m3 is placed immediately over the surface, the increase in the effective stress at centre of the clay layer at the instant will be ______ kpa.
 
Given:
(i) γsat of clay = 19 kN/m3
(ii) γsat of sand = 20 kN/m3
(iii) ) γt of sand above water table = 18 kN/m3
(iv) γ = 10 kN/m3
    Correct answer is '0'. Can you explain this answer?
    Verified Answer
    A saturated clay layer 5m thick is overlain by sand layer 3m deep. Con...
    Case I: When there is no fill over the surface
    Effective vertical stress at centre of clay layer:
     = 18 × 2+20 × 1+19 × 2.5 − 10 × 3.5
     = 68.5kN/m= 68.5kpa
    Case: II when 2m thick sand is immediately placed over the surface
    When 2m thick sand is immediately placed over the surface, all the stresses is taken up by pore water. Hence pore water pressure is increased by 2(γt)sand2(γt)sand
    Increase in pore water pressure at centre of clay layer = 2 × 20 = 40 kN/m2
    Δ u = 40 kpa
    Also, simultaneous increase in total vertical stress at centre of clay layer = 2 × 20 = 40 kN/m2
    Δ σ = 40 kN/m2
    Effective stress at centre of clay layer:
     = 18 × 2 + 20×1 + 40 + 19×2.5 −10×3.5 −40
     = 68.5kpa
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    A saturated clay layer 5m thick is overlain by sand layer 3m deep. Consider the water table to be present at a depth of 2m below the ground level or surface. If 2m deep sand layer of Bulk unit weight 20 kN/m3is placed immediately over the surface, the increase in the effective stress at centre of the clay layer at the instant will be ______ kpa.Given:(i) γsatof clay = 19 kN/m3(ii) γsatof sand = 20 kN/m3(iii) ) γtof sand above water table = 18 kN/m3(iv) γw­= 10 kN/m3Correct answer is '0'. Can you explain this answer?
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    A saturated clay layer 5m thick is overlain by sand layer 3m deep. Consider the water table to be present at a depth of 2m below the ground level or surface. If 2m deep sand layer of Bulk unit weight 20 kN/m3is placed immediately over the surface, the increase in the effective stress at centre of the clay layer at the instant will be ______ kpa.Given:(i) γsatof clay = 19 kN/m3(ii) γsatof sand = 20 kN/m3(iii) ) γtof sand above water table = 18 kN/m3(iv) γw­= 10 kN/m3Correct answer is '0'. Can you explain this answer? for Civil Engineering (CE) 2024 is part of Civil Engineering (CE) preparation. The Question and answers have been prepared according to the Civil Engineering (CE) exam syllabus. Information about A saturated clay layer 5m thick is overlain by sand layer 3m deep. Consider the water table to be present at a depth of 2m below the ground level or surface. If 2m deep sand layer of Bulk unit weight 20 kN/m3is placed immediately over the surface, the increase in the effective stress at centre of the clay layer at the instant will be ______ kpa.Given:(i) γsatof clay = 19 kN/m3(ii) γsatof sand = 20 kN/m3(iii) ) γtof sand above water table = 18 kN/m3(iv) γw­= 10 kN/m3Correct answer is '0'. Can you explain this answer? covers all topics & solutions for Civil Engineering (CE) 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for A saturated clay layer 5m thick is overlain by sand layer 3m deep. Consider the water table to be present at a depth of 2m below the ground level or surface. If 2m deep sand layer of Bulk unit weight 20 kN/m3is placed immediately over the surface, the increase in the effective stress at centre of the clay layer at the instant will be ______ kpa.Given:(i) γsatof clay = 19 kN/m3(ii) γsatof sand = 20 kN/m3(iii) ) γtof sand above water table = 18 kN/m3(iv) γw­= 10 kN/m3Correct answer is '0'. Can you explain this answer?.
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