Figure H7-1 shows a soil proﬁle consisting of a clay layer underlain by layer of dense sand. Above the clay layer is a layer of sand. For the portion of the upper sand layer above the groundwater table, the moisture content (w) is 18%, the degree of saturation (S) is 80%, and the speciﬁc gravity of solids (Gs) is 2.68. Below the groundwater table, the moisture content is 20%. For the clay layer the moisture content is 40% and the speciﬁc gravity of solids is 2.70. Determine the effective stress at the clay dense-sand interface (Point A) prior to excavation.Assuming that, following the excavation, the water remains at the elevation of the groundwater table shown in the Figure,Repeat part (a) immediately after the excavation is complete.Determine the depth of water that can be pumped away (i.e., d) without causing “quick” condition t point A. 2.0 m↑3.0 m+8.0 mGround surfaceŽClayExcavationADense sandSand3.5 m↓d

Sand layer above ground water table Moisture content, w = 18% Degree of saturation, S = 80% Specific…

Answered: Figure H7-1 shows a soil proﬁle…

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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Figure H7-1 shows a soil proﬁle consisting of a clay layer underlain by layer of dense sand. Above the clay layer is a layer of sand. For the portion of the upper sand layer above the groundwater table, the moisture content (w) is 18%, the degree of saturation (S) is 80%, and the speciﬁc gravity of solids (Gs) is 2.68. Below the groundwater table, the moisture content is 20%. For the clay layer the moisture content is 40% and the speciﬁc gravity of solids is 2.70.

Determine the effective stress at the clay dense-sand interface (Point A) prior to excavation.

Assuming that, following the excavation, the water remains at the elevation of the groundwater table shown in the Figure,

Repeat part (a) immediately after the excavation is complete.
Determine the depth of water that can be pumped away (i.e., d) without causing “quick” condition t point A.

2.0 m
↑
3.0 m
+
8.0 m
Ground surface
Ž
Clay
Excavation
A
Dense sand
Sand
3.5 m
↓
d

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