An exploratory drill hole was made in a stiff saturated clay having a moisture content of 29% and G= 2.68 as shown below. The sand layer underlying the clay was observed to be under artesian pressure. Water in the drill hole rose to a height of 6 ft above the top of sand layer xaWAQ the clay, determine the safe depth of excavation before the bottom heaves. X. If an open excavation is to be made in Exploratory drill hole 10 ft 6 ft 4.5 ft E Saturated clay D Sand

An exploratory drill hole was made in a stiff saturated clay having a moisture content of 29% and G= 2.68 as shown below. The sand layer underlying the clay was observed to be under artesian pressure. Water in the drill hole rose to a height of 6 ft above the top of sand layer xaWAQ the clay, determine the safe depth of excavation before the bottom heaves. X. If an open excavation is to be made in Exploratory drill hole 10 ft 6 ft 4.5 ft E Saturated clay D Sand

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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Question

3- An exploratory drill hole was made in a stiff saturated clay having a moisture content of 29% and G;= 2.68 as
shown below. The sand layer underlying the clay was observed to be under artesian pressure. Water in the drill
hole rose to a height of 6 ft above the top of sand layer xaWAQ
the clay, determine the safe depth of excavation before the bottom heaves.
X. If an open excavation is to be made in
Exploratory drill hole
10 ft
6 ft
4.5 ft
Saturated clay
Sand

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An exploratory drill hole was made in a stiff saturated clay having a moisture content of 29% and G, = 2.68 (Figure 9.27). The sand layer underlying the clay was observed to be under artesian pressure. Water in the drill hole rose to a height of 6 m above the top of the sand layer. a. If an open excavation is to be made in the clay, determine the safe depth of excavation before the bottom heaves. b. How much is the pressure at the interface of the clay and sand? c. If a factor of safety of 2.0 is to be ensured, how deep should be the excavation from the ground surface?
A 5-ft fill is to be placed over the following soil profile shown below. Determine if the clay is normally consolidated or over-consolidated. The pre-consolidation pressure (past maximum consolidation stress) of the clay is 1000 lb/ft3. 5 ft 2 ft 4 ft Proposed Fill, y = 120 lb/ft³ Sand Clay Rock 2 ft A Ydry = 100 lb/ft³ Ground water table Ysat 110 lb/ft³ = o'= Pc = 1000 lb/ft²
9.7 An exploratory drill hole was made in a stiff saturated clay having a moisture content of 29% and G, = 2.68 (Figure 9.27). The sand layer underlying the clay was observed to be under artesian pressure. Water in the drill hole rose to a height of 6 m above the top of the sand layer. If an open excavation is to be made in the clay, determine the safe depth of excavation before the bottom heaves. Exploratory drill hole 10 m 45 m Saturated clay Sand Figure 9.27
An oedometer test on a 1" thick, doubly-drained sample from the clay stratum (shown below) attained 50% consolidation in 6.5 minutes. Find: (a) The total differential settlement of the fully loaded tank. (b) The time required for 75% consolidation in the field. (c) The depth of excavation for minimal settlement. = 35° Y-120 pcf = 10 ° c = 250 psf Ysat 110 pcf - Ca 1.27 Ce=0.40 40 ft 10 ft 57 ft D = 150 ft Steel Oil Tank Flexible steel foundation Sand Clay A You = 60 pcf Sand B Uniform, normally consolidated clay W.T.
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