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.

Structural Analysis
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Chapter2: Loads On Structures
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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.
Transcribed Image Text: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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