1. A fill is placed at the ground surface over the entire site and the weight of the fill is expected to cause a surcharge pressure of 1000 lb/ft?. This surcharge pressure can cause a consolidation of the clay layer. q=1000 psf >fty GWT 5 ft Medium dense sand, 20 ft above GWT, ya=110 pcf below GWT, Ysa= 115 pcf NC clay, y= 120 pcf eo=0.8 C=0.30 50 ft Cy=0.1 ft2/day Sand (a) Calculate the maximum consolidation settlement of the clay layer caused by this uniform loading of q=1000 lb/ft? at the middle of the clay layer. (b) Determine how long (in days) it will take for a settlement of 3 inches to occur. (c) At 8 months after the fill is placed, determine the water pressure at the top of the clay layer at that time. [Note1: at any depth, the water pressure is the sum of the hydrostatic water pressure plus the remaining excess pore water pressure]

1. A fill is placed at the ground surface over the entire site and the weight of the fill is expected to cause a surcharge pressure of 1000 lb/ft?. This surcharge pressure can cause a consolidation of the clay layer. q=1000 psf >fty GWT 5 ft Medium dense sand, 20 ft above GWT, ya=110 pcf below GWT, Ysa= 115 pcf NC clay, y= 120 pcf eo=0.8 C=0.30 50 ft Cy=0.1 ft2/day Sand (a) Calculate the maximum consolidation settlement of the clay layer caused by this uniform loading of q=1000 lb/ft? at the middle of the clay layer. (b) Determine how long (in days) it will take for a settlement of 3 inches to occur. (c) At 8 months after the fill is placed, determine the water pressure at the top of the clay layer at that time. [Note1: at any depth, the water pressure is the sum of the hydrostatic water pressure plus the remaining excess pore water pressure]

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

Calculation of Settlement

The vertical displacement of the structural foundation due to the loading from the superstructure is known as settlement. It is due to the reduction of air voids present in the soil. The amount of vertical displacement depends on the bearing capacity of the soil on which the foundation is laid. The effect of the settlement depends on the magnitude of settlement, uniformity, and the structural design of the structure. The maximum allowable settlement for residential and office buildings should be less than 18 mm, for industrial buildings, it is 38 mm and for commercial buildings, it is 25 mm.

Question

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1. A fill is placed at the ground surface over the entire site and the weight of the fill is expected to
cause a surcharge pressure of 1000 lb/ft?. This surcharge pressure can cause a consolidation of the
clay layer.
q=1000 psf
5 ft
, GWT
Medium dense sand,
20 ft
above GWT, ya=110 pcf
below GWT, Ysa= 115 pcf
NC clay, y= 120 pcf
eo=0.8
C=0.30
50 ft
Cy=0.1 ft2/day
Sand
(a) Calculate the maximum consolidation settlement of the clay layer caused by this uniform loading
of q=1000 lb/ft? at the middle of the clay layer.
(b) Determine how long (in days) it will take for a settlement of 3 inches to occur.
(c) At 8 months after the fill is placed, determine the water pressure at the top of the clay layer at
that time. [Note1: at any depth, the water pressure is the sum of the hydrostatic water pressure plus
the remaining excess pore water pressure]

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