During the construction of a highway bridge, the average per- manent load on the clay layer is expected to increase by about 115 kN/m². The aver- age effective overburden pressure at the middle of the clay layer is 210 kN/m?. Here, H. = 6 m, C. = 0.28, e, = 0.9, and c, = 0.36 m/mo. The clay is normally consoli- dated. Determine (a) The total primary consolidation settlement of the bridge without precompression (b) The surcharge, Aơin, needed to eliminate the entire primary consolidation settlement in nine months by precompression with the addition of some sand drains. Assume that r = 0.1 m, d. = 3 m, c, = cr: and the surcharge is applied instantaneously. Also assume that this is a no-smear case.
During the construction of a highway bridge, the average per- manent load on the clay layer is expected to increase by about 115 kN/m². The aver- age effective overburden pressure at the middle of the clay layer is 210 kN/m?. Here, H. = 6 m, C. = 0.28, e, = 0.9, and c, = 0.36 m/mo. The clay is normally consoli- dated. Determine (a) The total primary consolidation settlement of the bridge without precompression (b) The surcharge, Aơin, needed to eliminate the entire primary consolidation settlement in nine months by precompression with the addition of some sand drains. Assume that r = 0.1 m, d. = 3 m, c, = cr: and the surcharge is applied instantaneously. Also assume that this is a no-smear case.
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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Transcribed Image Text:During the construction of a highway bridge, the average per-
manent load on the clay layer is expected to increase by about 115 kN/m². The aver-
age effective overburden pressure at the middle of the clay layer is 210 kN/m?. Here,
H. = 6 m, C. = 0.28, e, = 0.9, and c, = 0.36 m/mo. The clay is normally consoli-
dated. Determine
(a) The total primary consolidation settlement of the bridge without precompression
(b) The surcharge, Aơin, needed to eliminate the entire primary consolidation
settlement in nine months by precompression
with the addition of some sand drains. Assume that r = 0.1 m,
d. = 3 m, c, = cr: and the surcharge is applied instantaneously.
Also
assume that this is a no-smear case.
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