Q.1. The figure below shows the flow net for seepage under a concrete dam. The is silty sandwith coefficient of permeability of 4X104 cm/sec, a void ratio of 0.6 and specific gravity of 2.7.The height of water upstream is H=( 6+)(a) Determine the flow rate under the dam in m/day per m length of the dam.(b) Determine the water pressure distribution at the base of the dam. (Select 3 points under thebase. Comment on your results.m (where X is your group number).(c) From (b), calculate the resultant uplift force and its location from the upstream face of thedam. Also, calculate the weight of the dam to prevent uplift using a factor of safety of 5.(d) What is the factor of safety against piping? Is the dam safe?(e) Calculate the total vertical overburden stress, pore water pressure and the effective verticaloverburden stress at Points A and B. Comment on your results.H17.5 m1.25 mx B4 mImpervious clay

Assume group no. X=10then head H=6+1010=7.0 mpermeability k=4×10-4 cm/sec=4×10-6 m/secno. of flow…

Q.1. The figure below shows the flow net for seepage under a concrete dam. The is silty sand with coefficient of permeability of 4X104 cm/sec, a void ratio of 0.6 and specific gravity of 2.7. The height of water upstream is H =( 6 +) m (where X is your group number). (a) Determine the flow rate under the dam in m³/day per m length of the dam. (b) Determine the water pressure distribution at the base of the dam. (Select 3 points under the base. Comment on your results. (c) From (b), calculate the resultant uplift force and its location from the upstream face of the dam. Also, calculate the weight of the dam to prevent uplift using a factor of safety of 5. (d) What is the factor of safety against piping? Is the dam safe? (e) Calculate the total vertical overburden stress, pore water pressure and the effective vertical overburden stress at Points A and B. Comment on your results. H 17.5 m E1.25 m m 3D 3D Impervious clay

Q.1. The figure below shows the flow net for seepage under a concrete dam. The is silty sand with coefficient of permeability of 4X104 cm/sec, a void ratio of 0.6 and specific gravity of 2.7. The height of water upstream is H =( 6 +) m (where X is your group number). (a) Determine the flow rate under the dam in m³/day per m length of the dam. (b) Determine the water pressure distribution at the base of the dam. (Select 3 points under the base. Comment on your results. (c) From (b), calculate the resultant uplift force and its location from the upstream face of the dam. Also, calculate the weight of the dam to prevent uplift using a factor of safety of 5. (d) What is the factor of safety against piping? Is the dam safe? (e) Calculate the total vertical overburden stress, pore water pressure and the effective vertical overburden stress at Points A and B. Comment on your results. H 17.5 m E1.25 m m 3D 3D Impervious clay

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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Concept explainers

Field applications of hydraulic conductivity

Hydraulic conductivity is one of the hydraulic properties of soil defined as a measurement of the ability of a porous medium to permit water movement or fluid flow through it. It is denoted by the letter K. It is influenced by the density and viscosity of the fluid. It is also called permeability. Hydraulic conductivity is defined as the ratio of velocity to the hydraulic gradient. The different methods used to determine the hydraulic conductivity are laboratory methods (constant head permeability tests and falling head tests), in-situ field methods (pumping in and pumping out tests), small scale field tests (infiltration tests and slug tests), and indirect methods such as estimation from grain size, consolidation test data, and horizontal capillary test. The pedotransfer function (PTF) method is a specific empirical estimating approach employed in the soil sciences is also used to determine the hydraulic conductivity of the soil.

Question

Q.1. The figure below shows the flow net for seepage under a concrete dam. The is silty sand
with coefficient of permeability of 4X104 cm/sec, a void ratio of 0.6 and specific gravity of 2.7.
The height of water upstream is H=( 6+)
(a) Determine the flow rate under the dam in m/day per m length of the dam.
(b) Determine the water pressure distribution at the base of the dam. (Select 3 points under the
base. Comment on your results.
m (where X is your group number).
(c) From (b), calculate the resultant uplift force and its location from the upstream face of the
dam. Also, calculate the weight of the dam to prevent uplift using a factor of safety of 5.
(d) What is the factor of safety against piping? Is the dam safe?
(e) Calculate the total vertical overburden stress, pore water pressure and the effective vertical
overburden stress at Points A and B. Comment on your results.
H
17.5 m
1.25 m
x B
4 m
Impervious clay

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