For the proposed fill shown assume the ultimate consolidation settlement of the soft clay layer is 1.6 ft. The owner wants to build a structure on top of the fill. The structure can withstand a total settlement of 4 in. How long must the owner wait after placement of the fill before building the structure on top of the fill? Use the simplified method. Assume all consolidation occurs in the soft clay layer.
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For the proposed fill shown assume the ultimate consolidation
settlement of the soft clay layer is...
9. (10 points) A consolidation test performed on a sample from -depth of the clay layer...
9. (10 points) A consolidation test performed on a sample from -depth of the clay layer results the following: initial void ratio = 0.6-e coefficient of re-compression = 0.025-Cr coefficient of compression 0.224 C preconsolidation stress 3000 psf. coefficient of consolidation = 0.065 ft2/day a) Calculate the primary consolidation setlement of the clay layer due to the proposed fill. b) Find the time it takes to complete 90% of the estimated primary consolidation settlement. a) Proposed fill y 120 lbt...
The Stratum of the clay and loading shown in Figure below: Find: Consolidation settlement after 2...
The Stratum of the clay and loading shown in Figure below:
Find:
Consolidation settlement after 2 years of the construction
(Cv=0.3 m2/year).
Time factor at consolidation settlement of 90%.
Time to reach a 45% consolidation settlement.
Draw he, hp, and ht distributions
X1=6000 X2=7 X3=10 X4=4.8 X5=4.0 Weight of tank+ water + Weight of the columns =X1 KN Tank Columns Fill X, (X, *X, *1) m Footing y= 17 kN/m 4m Sand y= 18 kN/m², = 25° Clay, y= 19...
The time for 50% consolidation of a 25 mm thick clay specimen (drained at top and bottom) in the laboratory is 1...
The time for 50% consolidation of a 25 mm thick clay specimen (drained at top and bottom) in the laboratory is 150 sec. How long (in days) will it take for a 3 m thick layer of the same clay in the field under the same pressure increment to reach 75% consolidation? There is an impermeable shale layer at the bottom of the clay layer in the field I. 2. Use Figure 1 for the following Compute the vertical effective...
1. An 8-m thick normally consolidated clay layer is doubly drained as shown below. (This means...
1. An 8-m thick normally consolidated clay layer is doubly drained as shown below. (This means that a very pervious layer compared to the clay exists on top of and under the clay layer) The embankment applied an average vertical stress increase of 100 kPa to the clay layer. The water table is located at the mid depth of the sand layer. Assume the sand above the water table is dry 0 Pore water pressure, u (kPa) 20 40 60...
3. Now consider the following scenario at the same site. Instead of adding a fill, assume...
3. Now consider the following scenario at the same site. Instead of adding a fill, assume groundwater table drops from 6ft to 18ft depth as shown below. Oft Initial GWF depth 6.0ft.'.:':; Silty Sand (SP-SM) 105lb/ftabove GWT....'.' and 112lb/ft below GWTFinai th 18.0f 30ft Lean Clay (CL); Y 100lb/ft3 46ft Determine the stress increase, Δσ, and the final vertical effective stress. σ'zf at the middle of clay layer (=sample depth) due to lowering of GWT. 12 points] a. b. Estimate...
You are evaluating the geotechnical characteristics of a Miami site for a proposed office buildin...
You are evaluating the geotechnical characteristics of a Miami site for a proposed office building. Subsurface investigation showed that the site consists of the following layers: (1) a 5-ft sandy laver with a unit weight of 100 pcf (2) a 10-ft silty sand layer with a saturated unit weight of 115 pcf. (3) a 20-ft saturated clay layer with a unit weight of 118 pef, void ratio of 0.85, and underlain by gravels. The site seemed to have strong potential...
geotechnical engineering The soil profile at a site consists of a clay layer 10 m thick,...
geotechnical engineering
The soil profile at a site consists of a clay layer 10 m thick, sandwich between two sand layers. The top sand layer has a density of 1.9 Mg/m² and is 5 m thick. Below this layer is a 10 m thick clay layer with a saturated density of 1.8 Mg/m' and a saturated water content 42%. The deeper sand layer has a saturated density of 1.9 Mg/m² and extend to the depth investigated at the site. The...
Variation of U, with T, and z/Hdr Proposed fill y 19.2 kN/m3 3,0 m 0 Compressibility of Soil teh 2.0 Y -18.5 kN/m3-; 1.5m-U Fine to medium sand (SP) 2.0 m 2 1.5 0.7 0.8 3.0 m 0.9 4.0m Soft clay (CL)...
Variation of U, with T, and z/Hdr Proposed fill y 19.2 kN/m3 3,0 m 0 Compressibility of Soil teh 2.0 Y -18.5 kN/m3-; 1.5m-U Fine to medium sand (SP) 2.0 m 2 1.5 0.7 0.8 3.0 m 0.9 4.0m Soft clay (CL) γ 16.0 kN/m3 0.5 10.0m (4 3 batto oLthe soil specin 0 0.1 023 04 03 06 7 08 09 10 Degree of eomsolidasion,U Example: Degree of consolidation Dense sand and gravel The proposed sand fill is 3...
Problem 7 The soil profile at a site consists of a top 4 m layer of...
Problem 7 The soil profile at a site consists of a top 4 m layer of dense sand followed by 2 m of clay, which is underlain by a stiff stratum. The water table is at 2 m below the ground level. The following data was obtained from a consolidation test on an undisturbed sample obtained from the middle of the clay layer: water content 5 36%, specific gravity of the clay grains = 2.72, compression index = 0.72, recompression...
Two undisturbed clay samples were taken from the middle of the overconsolidated and normally consolidated clay layers in the soil profile shown. The water table is at the top of the overconsolidated c...
Two undisturbed clay samples were taken from the middle of the
overconsolidated and normally consolidated clay layers in the soil
profile shown. The water table is at the top of the
overconsolidated clay layer. Consolidation tests were carried out
on the two samples and the results are summarized in the table
below. Assume that the bulk, dry, and saturated unit weights of the
sand are 16 kN/m3, 16 kN/m3 and 19
kN/m3, respectively. The specific gravity of the clay
soil...
9. (10 points) A consolidation test performed on a sample from -depth of the clay layer results the following: initial void ratio = 0.6-e coefficient of re-compression = 0.025-Cr coefficient of compression 0.224 C preconsolidation stress 3000 psf. coefficient of consolidation = 0.065 ft2/day a) Calculate the primary consolidation setlement of the clay layer due to the proposed fill. b) Find the time it takes to complete 90% of the estimated primary consolidation settlement. a) Proposed fill y 120 lbt...
The Stratum of the clay and loading shown in Figure below:
Find:
Consolidation settlement after 2 years of the construction
(Cv=0.3 m2/year).
Time factor at consolidation settlement of 90%.
Time to reach a 45% consolidation settlement.
Draw he, hp, and ht distributions
X1=6000 X2=7 X3=10 X4=4.8 X5=4.0 Weight of tank+ water + Weight of the columns =X1 KN Tank Columns Fill X, (X, *X, *1) m Footing y= 17 kN/m 4m Sand y= 18 kN/m², = 25° Clay, y= 19...
The time for 50% consolidation of a 25 mm thick clay specimen (drained at top and bottom) in the laboratory is 150 sec. How long (in days) will it take for a 3 m thick layer of the same clay in the field under the same pressure increment to reach 75% consolidation? There is an impermeable shale layer at the bottom of the clay layer in the field I. 2. Use Figure 1 for the following Compute the vertical effective...
1. An 8-m thick normally consolidated clay layer is doubly drained as shown below. (This means that a very pervious layer compared to the clay exists on top of and under the clay layer) The embankment applied an average vertical stress increase of 100 kPa to the clay layer. The water table is located at the mid depth of the sand layer. Assume the sand above the water table is dry 0 Pore water pressure, u (kPa) 20 40 60...
3. Now consider the following scenario at the same site. Instead of adding a fill, assume groundwater table drops from 6ft to 18ft depth as shown below. Oft Initial GWF depth 6.0ft.'.:':; Silty Sand (SP-SM) 105lb/ftabove GWT....'.' and 112lb/ft below GWTFinai th 18.0f 30ft Lean Clay (CL); Y 100lb/ft3 46ft Determine the stress increase, Δσ, and the final vertical effective stress. σ'zf at the middle of clay layer (=sample depth) due to lowering of GWT. 12 points] a. b. Estimate...
You are evaluating the geotechnical characteristics of a Miami site for a proposed office building. Subsurface investigation showed that the site consists of the following layers: (1) a 5-ft sandy laver with a unit weight of 100 pcf (2) a 10-ft silty sand layer with a saturated unit weight of 115 pcf. (3) a 20-ft saturated clay layer with a unit weight of 118 pef, void ratio of 0.85, and underlain by gravels. The site seemed to have strong potential...
geotechnical engineering
The soil profile at a site consists of a clay layer 10 m thick, sandwich between two sand layers. The top sand layer has a density of 1.9 Mg/m² and is 5 m thick. Below this layer is a 10 m thick clay layer with a saturated density of 1.8 Mg/m' and a saturated water content 42%. The deeper sand layer has a saturated density of 1.9 Mg/m² and extend to the depth investigated at the site. The...
Variation of U, with T, and z/Hdr Proposed fill y 19.2 kN/m3 3,0 m 0 Compressibility of Soil teh 2.0 Y -18.5 kN/m3-; 1.5m-U Fine to medium sand (SP) 2.0 m 2 1.5 0.7 0.8 3.0 m 0.9 4.0m Soft clay (CL) γ 16.0 kN/m3 0.5 10.0m (4 3 batto oLthe soil specin 0 0.1 023 04 03 06 7 08 09 10 Degree of eomsolidasion,U Example: Degree of consolidation Dense sand and gravel The proposed sand fill is 3...
Problem 7 The soil profile at a site consists of a top 4 m layer of dense sand followed by 2 m of clay, which is underlain by a stiff stratum. The water table is at 2 m below the ground level. The following data was obtained from a consolidation test on an undisturbed sample obtained from the middle of the clay layer: water content 5 36%, specific gravity of the clay grains = 2.72, compression index = 0.72, recompression...
Two undisturbed clay samples were taken from the middle of the
overconsolidated and normally consolidated clay layers in the soil
profile shown. The water table is at the top of the
overconsolidated clay layer. Consolidation tests were carried out
on the two samples and the results are summarized in the table
below. Assume that the bulk, dry, and saturated unit weights of the
sand are 16 kN/m3, 16 kN/m3 and 19
kN/m3, respectively. The specific gravity of the clay
soil...
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