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

Fundamentals of Geotechnical Engineering (MindTap Course List)

5th Edition

ISBN:9781305635180

Author:Braja M. Das, Nagaratnam Sivakugan

Publisher:Braja M. Das, Nagaratnam Sivakugan

Chapter11: Ground Improvement

Section: Chapter Questions

Problem 11.10CTP

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Concept explainers

Principles of Seepage

In hydrology, when water flows down in a pore or crack of unsaturated soil due to gravity, the deep layer of soil is called seepage. It is the slow movement of water in the soil layer. Seepage is mainly found near hydraulic structures and is responsible for the stability of earthen-type hydraulic structures.

Question

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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