4.An exploratory drill hole was made in a stiff saturated clay having a moisture content of 22% and Gs = 2.82 as shown in Figure 1.3. The sand layer underlying the clay was observed to be under artesian pressure. Water in the drill hole rose to a height of 8 m above the top of sand layer. If an open excavation is to be made in the clay, determine: a. The maximum depth of excavation before the bottom heaves.

4.An exploratory drill hole was made in a stiff saturated clay having a moisture content of 22% and Gs = 2.82 as shown in Figure 1.3. The sand layer underlying the clay was observed to be under artesian pressure. Water in the drill hole rose to a height of 8 m above the top of sand layer. If an open excavation is to be made in the clay, determine: a. The maximum depth of excavation before the bottom heaves.

Principles of Foundation Engineering (MindTap Course List)

8th Edition

ISBN:9781305081550

Author:Braja M. Das

Publisher:Braja M. Das

Chapter10: Drilled-shaft Foundations

Section: Chapter Questions

Problem 10.10P

See similar textbooks

Similar questions

A hole was made in a stiff saturated soil having a Gs = 2.71 and moisture content of 0.30. The sand layer underlying the clay was observed to be under artesian pressure. Water in the drill hole rose to a height of 6.30 meters above the top of the sand layer %3D Exploratory drill hole 10 m 6.3 m 4.5 m Saturated clay L Sand a. If an open excavation is to be made in the clay, determine the safe depth of excavation before the bottom heaves. Round your final answer to three significant figures. b. How much is the pressure at the interface of the clay and sand? c. f a factor of safety of 2.0 is to be ensured, how deep should be the excavation from the ground surface? Note: Draw Free Body Digram and show full solution Topic: Soil Stresses (Soil Mechanics_
An exploratory drill hole was made in a stiff saturated clay (Gs = 2.72, and w = 35%). The sand layer underlying the clay was observed to be under artesian pressure. Water in the drill hole rose to a height of 12 ft above the top of the sand layer. If an open excavation is to be made in the clay, how deep can the excavation proceed before the bottom heaves?
An exploratory drill hole was made in a stiff saturated clay having a moisture content of 38.9% and Gs = 2.34 as shown in the figure. The sand layer underlying the clay was observed to be under artesian pressure. Water in the drill hole rose to a height of 13.8 ft above the top of sand layer. If an open excavation is to be made in the clay, determine the (a) unit weight of the clay, and the (b) maximum cut before the bottom heaves.
An exploratory drill hole was made in a stiff saturated clay, as shown in Figure 1, having a moisture content of 25% and Gs = 2.56. The sand layer underlying the clay was observed to be under artesian pressure. Water in the drill hole rose to a height of 3 m above the top of sand layer. If an open excavation is to be made in the clay. a.What is the maximum depth of excavation before the bottom heaves? b.What would be the required height of water inside the cut in order to ensure a factor of safety of 1.5?
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?
8. An exploratory drill hole was made in a saturated stiff clay having a water content of 32%. It was observed that the sand layer underlying the clay was under artesian pressure water in the drill hole rose to a height of 4 m. above the top of the sand layer. If an open excavation is to be made in the clay. (See picture below) Determine the void ratio of clay. (Answer: 0.864) Determine the saturated unit weight of clay. (Answer: 18.76 kN/m3) How deep can the excavation proceed before the bottom of the saturated clay heaves or when its effective stress is zero. (Answer: 5.91 m)
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
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
Exploratory drill hole 12m 8m 4.5 m An exploratory drill hole was made in a stiff saturated clay having a moisture content of 22% and Gs = 2.16 as shown in Figure. The sand layer underlying the clay was observed to be under artesian pressure. Water in the drill hole rose to a height of 8 m above the top of sand layer. If an open excavation is to be made in the clay, determine: a. The maximum depth of excavation before the bottom heaves. b. What would be the required height of water inside the cut in order to ensure a factor of safety of 2.1?
An exploratory drill hole was made in a stiff saturated clay (see Figure 9.9). The sand layer underlying the clay was observed to be under artesian pressure. Water in the drill hole rose to a height of 4 m above the top of the sand layer. If an open excavation is to be made in the clay, how deep can the excavation proceed before the bottom heaves? Exploratory drill hole G,= 2.72 Moisture content =w= 35% 6.1 m 4. 4 m Saturated clay Sand
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.
A large building is to be built on a thick layer of normally consolidated clay shown in the figure below. The building is to be placed at the bottom of a 4 m deep excavation, which will correspond to 1 level of parking garages. The water table remains 4 m below the ground surface during the entire process. Find the OCR in the middle of the clay layer at Point A, a long time after excavation and before construction of the building. (Answer tolerance = 2%).