9.4 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
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- 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?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. b. What would be the required height of water inside the cut in order to ensure a factor of safety of 2? Exploratory drill hole 12m 8m 4.5 m Saturated clay O Sand Figure 1.3.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
- 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 9.27An 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?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 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?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.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
- Question 8 A gulf coast formation at 7,500 ft is drilled using 10.5 lb/gal mud. Total circulation pressure is 2500 psi; out of which 60% is lost across bit nozzles and the other 40% is lost equally between drilling string and annulus. Find formation pressure, fracture pressures, overburden pressure, and ECD. Is this a safe drilling operation?Q1 The lower sand layer in the soil profile shown below is in an artesian condition. Calculate: 2 a) The effective stress () at the top and base of the clay layer. 2b) The height of water in the piezometer for 5 = 0 at the base of the clay layer. > c) The maximum depth (Z) of the proposed excavation (Figure Q1 (b)). (Assume Z>2 m). 4.0 m 2.0m Yary 16.6 kN/in³ Sand Ground water table Z Y.. W.T. Sand 2.0 m Sand Ysa 20.6 kN/m³ 4.0 m Year 20.6 kN/m³ Clay R Sand Ysar=20.5 kN/m³ Figure Q1 (b) Clay Sand Figure Q1 (a)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.