Assume a rigid strip footing is constructed on a normally consolidated clay layer under a uniformly...
Assume a rigid strip footing is constructed on a normally consolidated clay layer under a uniformly distributed vertical load. The depth of footing is zero and the water table is a few metres below the surface ground. The average shear strength parameters of the clay layer are:
- At the beginning of loading: fu = 0, cu = 50 kPa
- Long time after loading:, f’ = 25° and c’ = 0 kPa
Will the bearing capacity of this footing change, if the water table rises to the ground surface? Briefly explain.
Note: No calculation is required. Assume the ground and the base of footing are horizontal.
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Assume a rigid strip footing is constructed on a normally
consolidated clay layer under a uniformly...
please with clear and simple steps as possible, also write answer all questions ....thank you Q1....
please with clear and simple steps as possible, also write
answer all questions ....thank you
Q1. A load of 630 kN/m is carried on a strip footing 3 m wide at a depth of 1.5 m in a stiff clay with saturated unit weight 21 kN/m, the water table being at ground level Determine the factor of safety with respect to general shear failure (a) whe105 kN/m, and φ,-0°, (b) when c' = 10 kNm, and = 28。 13.0, 3.5]...
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...
7) (Total 20 pts) The figure shows a 20 m thick layer of normally consolidated clay...
7) (Total 20 pts) The figure shows a 20 m thick layer of normally consolidated clay (Y -18.6 kN/m3) that is one-dimensionally loaded by Δσ,-50kPa. The clay layer is below a 3 m thick layer of granular fill (y = 19.6 kN/m3), and a dense, compacted glacial till (impermeable) underlies the clay. The water table is located at the top of the clay layer. A 1-D consolidation test is performed on a 2.20 cm thick, doubly drained specimen from the...
A levee is constructed atop a 3m thick clay layer resting atop a sand layer. During...
A levee is constructed atop a 3m thick clay layer resting atop a sand layer. During a storm event, the levee retains water and the soil at the bottom of the channel is sand that is hydraulically connected to the sand beneath the clay. Head loss in the sand layer is negligible (i.e., the total head at point A is the same as the total head at point B), and water flows vertically upward through the clay. The water table...
The following case study involving a failure in fissured over-consolidated clay slope was reported by Henkel...
The following case study involving a failure in fissured over-consolidated clay slope was reported by Henkel and Skempton in 1954. The failure occurred in 1952 in Jackfield, Shropshire, England. The slope profile is shown in Figure 1. The failure was a translational slide where the average depth to the failure plane was 17 ft. The ground water table was very near or at the surface. The peak strength parameters of the over-consolidated clay are: cohesion, c'= 220 psf and friction...
All I need is step by btep formulas with relavent units, so that i can work...
All
I need is step by btep formulas with relavent units, so that i can
work out on excel. All I want is to make an excel spreadsheet whoch
can calculate output with varying inputs
Q2 A concrete strip footing with a width of B is founded at the depth of D. below the surface of a level site. The water table is at a depth of d below the base of footing. The soil at the site consists of...
Figure 3 A cutting 9 m deep is to be excavated in a saturated clay of...
Figure 3 A cutting 9 m deep is to be excavated in a saturated clay of unit weight of 19 kN/m2. The relevant shear strength parameters are Cu 30 kPa and Qu=0. A hard stratum underlies the clay at a depth of 11 m below the ground level. (a) Determine the slope angle at which failure would occur. (b) What is the allowable slope angle if the factor of safety FS-1.5 4
A Compute the total load, Qq, in kips, using the Hansen equations, for a footing 4...
A Compute the total load, Qq, in kips, using the Hansen equations, for a footing 4 ft wide by 8 ft long founded on a stratum of sand. The vertical load is uniformly distributed; there is no horizontal load. The value of Dƒ is 3.5 ft, the water table is at the base of the footing, and the friction angle from the triaxial test is 30. For the sand above the base of the footing, the water content is 20%,...
. A long natural slope in fissured overconsolidated clay is inclined to the horizontal with an...
. A long natural slope in fissured overconsolidated clay is inclined to the horizontal with an angle =15 o . The saturated unit weight of clay is 18 kN/m3 . The water table is at the surface and the seepage is roughly parallel to the slope. A slip has developed on a plane parallel to the surface at the depth of 4.0 m. Find the factor of safety along the slip plane, for the following two cases: a. Peak shear...
A 2-m clay layer (e = 0.92, G = 2,72. Cc = 1/3) is overlain with...
A 2-m clay layer (e = 0.92, G = 2,72. Cc = 1/3) is overlain with 3-m thick of sand layer (e =05, G = 2.62, w = 0). The water table is 15 m bel the ground (sand) surface. If a 3-m thick land fill (r = 17.3 kN/m2) is placed over the existing ground surface, compute the consolidation settlement in mm of the clay layer. (The clay is normally consolidated; final answer should be rounded-off to one decimal...
please with clear and simple steps as possible, also write
answer all questions ....thank you
Q1. A load of 630 kN/m is carried on a strip footing 3 m wide at a depth of 1.5 m in a stiff clay with saturated unit weight 21 kN/m, the water table being at ground level Determine the factor of safety with respect to general shear failure (a) whe105 kN/m, and φ,-0°, (b) when c' = 10 kNm, and = 28。 13.0, 3.5]...
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...
7) (Total 20 pts) The figure shows a 20 m thick layer of normally consolidated clay (Y -18.6 kN/m3) that is one-dimensionally loaded by Δσ,-50kPa. The clay layer is below a 3 m thick layer of granular fill (y = 19.6 kN/m3), and a dense, compacted glacial till (impermeable) underlies the clay. The water table is located at the top of the clay layer. A 1-D consolidation test is performed on a 2.20 cm thick, doubly drained specimen from the...
A levee is constructed atop a 3m thick clay layer resting atop a sand layer. During a storm event, the levee retains water and the soil at the bottom of the channel is sand that is hydraulically connected to the sand beneath the clay. Head loss in the sand layer is negligible (i.e., the total head at point A is the same as the total head at point B), and water flows vertically upward through the clay. The water table...
The following case study involving a failure in fissured over-consolidated clay slope was reported by Henkel and Skempton in 1954. The failure occurred in 1952 in Jackfield, Shropshire, England. The slope profile is shown in Figure 1. The failure was a translational slide where the average depth to the failure plane was 17 ft. The ground water table was very near or at the surface. The peak strength parameters of the over-consolidated clay are: cohesion, c'= 220 psf and friction...
All
I need is step by btep formulas with relavent units, so that i can
work out on excel. All I want is to make an excel spreadsheet whoch
can calculate output with varying inputs
Q2 A concrete strip footing with a width of B is founded at the depth of D. below the surface of a level site. The water table is at a depth of d below the base of footing. The soil at the site consists of...
Figure 3 A cutting 9 m deep is to be excavated in a saturated clay of unit weight of 19 kN/m2. The relevant shear strength parameters are Cu 30 kPa and Qu=0. A hard stratum underlies the clay at a depth of 11 m below the ground level. (a) Determine the slope angle at which failure would occur. (b) What is the allowable slope angle if the factor of safety FS-1.5 4
A 2-m clay layer (e = 0.92, G = 2,72. Cc = 1/3) is overlain with 3-m thick of sand layer (e =05, G = 2.62, w = 0). The water table is 15 m bel the ground (sand) surface. If a 3-m thick land fill (r = 17.3 kN/m2) is placed over the existing ground surface, compute the consolidation settlement in mm of the clay layer. (The clay is normally consolidated; final answer should be rounded-off to one decimal...
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