Q1. Based on the conventional analysis on the water flow in soil, it is usually assumed there is nowater flow in unsaturated soil. Please discuss whether this assumption is valid, and explain theassociated reasons.Q2. Discuss the soil classification w.r.t. 1) direction (i.e., orientation) and 2) spatial position.Q3. Please discuss 1) the physical meaning of the two components of flow equation for the 3Dwater flow in the unsaturated soil, 2) which component can be used to describe the nonlinearwater flow behavior in soil, and 3) difference of nonlinear water flow behavior between saturatedsoils and unsaturated soils.8²həx²KWX+KWW0²h+Kdy²1st componentW2WXwyd'hak dhak dhak dh+++əx əx dy dy əz əz2nd componentdz²WZ= 0Q4. Discuss the advantages of the principle of effective stress for saturated soil.o'=o-u₁Q5. Discuss the advantages and the main limitation of Bishop's effective stress.

Note:- Thank you for the question. As the given question is a multiple-type question, so as per the…

Q1. Based on the conventional analysis on the water flow in soil, it is usually assumed there is no water flow in unsaturated soil. Please discuss whether this assumption is valid, and explain the associated reasons.

Q1. Based on the conventional analysis on the water flow in soil, it is usually assumed there is no water flow in unsaturated soil. Please discuss whether this assumption is valid, and explain the associated reasons.

Principles of Geotechnical Engineering (MindTap Course List)

9th Edition

ISBN:9781305970939

Author:Braja M. Das, Khaled Sobhan

Publisher:Braja M. Das, Khaled Sobhan

Chapter9: In Situ Stresses

Section: Chapter Questions

Problem 9.11P

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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

Q1. Based on the conventional analysis on the water flow in soil, it is usually assumed there is no
water flow in unsaturated soil. Please discuss whether this assumption is valid, and explain the
associated reasons.
Q2. Discuss the soil classification w.r.t. 1) direction (i.e., orientation) and 2) spatial position.
Q3. Please discuss 1) the physical meaning of the two components of flow equation for the 3D
water flow in the unsaturated soil, 2) which component can be used to describe the nonlinear
water flow behavior in soil, and 3) difference of nonlinear water flow behavior between saturated
soils and unsaturated soils.
8²h
əx²
K
WX
+K
WW
0²h
+K
dy²
1st component
W2
WX
wy
d'hak dhak dhak dh
+
+
+
əx əx dy dy əz əz
2nd component
dz²
WZ
= 0
Q4. Discuss the advantages of the principle of effective stress for saturated soil.
o'=o-u₁
Q5. Discuss the advantages and the main limitation of Bishop's effective stress.

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