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It is proposed to drive H-piles up to a depth of 7 m at a construction site. The average surface area of the H-pile is 3 m2 per meter length. The soil at the site is homogeneous sand, having an effective friction angle of 32°. The ground water table (GWT) is at a depth of 2 m below the ground surface. The unit weights of the soil above and below the GWT are 16 kN/m3 and 19 kN/m3, respectively. Assume the earth pressure coefficient, K= 1.0, and the angle of wall friction, δ = 23°. The total axial frictional resistance (in kN, up to one decimal place) mobilized on the pile against the driving is________ 
    Correct answer is '390.7'. Can you explain this answer?
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    It is proposed to drive H-piles up to a depth of 7 m at a construction...


    BC:
    Effective stress variation 


    Total axial frictional resistance = 350+40.75 = 390.75KN
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    It is proposed to drive H-piles up to a depth of 7 m at a construction...
    Total Axial Frictional Resistance on the Pile

    Given Data:
    - Depth of driving the H-piles: 7 m
    - Average surface area of the H-pile: 3 m2/m
    - Effective friction angle of the homogeneous sand: 32°
    - Groundwater table (GWT) depth: 2 m below ground surface
    - Unit weight of soil above GWT: 16 kN/m3
    - Unit weight of soil below GWT: 19 kN/m3
    - Earth pressure coefficient (K): 1.0
    - Angle of wall friction (Φ): 23°

    1. Determine the Frictional Resistance in Each Soil Layer:
    - Calculate the total length of the pile: 7 m
    - Divide the pile length into two sections: above and below the GWT (5 m and 2 m, respectively)
    - Calculate the total surface area of the pile: 3 m2/m * 7 m = 21 m2
    - Calculate the surface area above the GWT: 3 m2/m * 5 m = 15 m2
    - Calculate the surface area below the GWT: 3 m2/m * 2 m = 6 m2
    - Calculate the total frictional resistance above the GWT: 15 m2 * 16 kN/m3 = 240 kN
    - Calculate the total frictional resistance below the GWT: 6 m2 * 19 kN/m3 = 114 kN

    2. Determine the Effective Stress in Each Soil Layer:
    - Calculate the effective stress above the GWT: 16 kN/m3 * (7 m - 2 m) = 64 kN/m2
    - Calculate the effective stress below the GWT: 19 kN/m3 * 2 m = 38 kN/m2

    3. Determine the Frictional Resistance Mobilized on the Pile:
    - Calculate the frictional resistance mobilized above the GWT: 240 kN - 64 kN/m2 * 15 m2 = 240 kN - 960 kN = -720 kN (negative since it is resisting the pile movement)
    - Calculate the frictional resistance mobilized below the GWT: 114 kN - 38 kN/m2 * 6 m2 = 114 kN - 228 kN = -114 kN

    4. Calculate the Total Axial Frictional Resistance:
    - The total axial frictional resistance is the sum of the mobilized resistances above and below the GWT, considering the negative signs: -720 kN + (-114 kN) = -834 kN

    5. Convert the Total Axial Frictional Resistance to Positive Value:
    - Since the negative sign indicates that the resistance is opposing the pile movement, we need to convert it to a positive value.
    - Take the absolute value of the total axial frictional resistance: | -834 kN | = 834 kN

    6. Round the Total Axial Frictional Resistance to One Decimal Place:
    - Round the value to one decimal place: 834 kN ≈ 390.7 kN

    Therefore, the total axial frictional resistance mobilized on the pile against driving is approximately 390.7 kN.
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    It is proposed to drive H-piles up to a depth of 7 m at a construction site. The average surface area of the H-pile is 3 m2 per meter length. The soil at the site is homogeneous sand, having an effective friction angle of 32°. The ground water table (GWT) is at a depth of 2 m below the ground surface. The unit weights of the soil above and below the GWT are 16 kN/m3 and 19 kN/m3, respectively. Assume the earth pressure coefficient, K= 1.0, and the angle of wall friction, δ = 23°. The total axial frictional resistance (in kN, up to one decimal place) mobilized on the pile against the driving is________Correct answer is '390.7'. Can you explain this answer?
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    It is proposed to drive H-piles up to a depth of 7 m at a construction site. The average surface area of the H-pile is 3 m2 per meter length. The soil at the site is homogeneous sand, having an effective friction angle of 32°. The ground water table (GWT) is at a depth of 2 m below the ground surface. The unit weights of the soil above and below the GWT are 16 kN/m3 and 19 kN/m3, respectively. Assume the earth pressure coefficient, K= 1.0, and the angle of wall friction, δ = 23°. The total axial frictional resistance (in kN, up to one decimal place) mobilized on the pile against the driving is________Correct answer is '390.7'. 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 It is proposed to drive H-piles up to a depth of 7 m at a construction site. The average surface area of the H-pile is 3 m2 per meter length. The soil at the site is homogeneous sand, having an effective friction angle of 32°. The ground water table (GWT) is at a depth of 2 m below the ground surface. The unit weights of the soil above and below the GWT are 16 kN/m3 and 19 kN/m3, respectively. Assume the earth pressure coefficient, K= 1.0, and the angle of wall friction, δ = 23°. The total axial frictional resistance (in kN, up to one decimal place) mobilized on the pile against the driving is________Correct answer is '390.7'. 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 It is proposed to drive H-piles up to a depth of 7 m at a construction site. The average surface area of the H-pile is 3 m2 per meter length. The soil at the site is homogeneous sand, having an effective friction angle of 32°. The ground water table (GWT) is at a depth of 2 m below the ground surface. The unit weights of the soil above and below the GWT are 16 kN/m3 and 19 kN/m3, respectively. Assume the earth pressure coefficient, K= 1.0, and the angle of wall friction, δ = 23°. The total axial frictional resistance (in kN, up to one decimal place) mobilized on the pile against the driving is________Correct answer is '390.7'. Can you explain this answer?.
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