1. A section of a dam constructed from a clay is shown in Fig 1. The dam is supported on 10 m of sandy clay with kx =1.2 x 10-5 cm/s and k = 2 x 1O-5 cm/s and a saturated unit weight of 17.8 kN/m³. Below the sandy clay is a thick layer of impervious clay. The upstream and downstream slopes are 1(V):2(H). (a) Draw the flow net under the dam. (b) Determine the porewater pressure distribution at the base of the dam. (c) Calculate the resultant uplift force and its location from the upstream face of the dam. 9 m 1 m 20 m. Clay 10 m.. Sandy clay Impervious clay Fig. 1 Prob. 1
1. A section of a dam constructed from a clay is shown in Fig 1. The dam is supported on 10 m of sandy clay with kx =1.2 x 10-5 cm/s and k = 2 x 1O-5 cm/s and a saturated unit weight of 17.8 kN/m³. Below the sandy clay is a thick layer of impervious clay. The upstream and downstream slopes are 1(V):2(H). (a) Draw the flow net under the dam. (b) Determine the porewater pressure distribution at the base of the dam. (c) Calculate the resultant uplift force and its location from the upstream face of the dam. 9 m 1 m 20 m. Clay 10 m.. Sandy clay Impervious clay Fig. 1 Prob. 1
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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Transcribed Image Text:1. A section of a dam constructed from a clay is shown in Fig 1. The dam is supported on 10 m of
sandy clay with kx =1.2 x 10-5 cm/s and k = 2 x 1O-5 cm/s and a saturated unit weight of 17.8
kN/m³. Below the sandy clay is a thick layer of impervious clay. The upstream and downstream
slopes are 1(V):2(H).
(a) Draw the flow net under the dam.
(b) Determine the porewater pressure distribution at the base of the dam.
(c) Calculate the resultant uplift force and its location from the upstream face of the dam.
9 m
1 m
20 m.
Clay
10 m..
Sandy clay
Impervious clay
Fig. 1 Prob. 1
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