Q- A raft foundation 10m wide and 12 m long is to be constructed in a clayey soil having shear strength of 12kN/2. Unit weight of soil is 16 kN/m³. The ground surface carries a surcharge of 20 kN/m², the factor of safety is 1.2 and the value of Nc = 5.7. The safe depth of foundation will be approximately.

Q- A raft foundation 10m wide and 12 m long is to be constructed in a clayey soil having shear strength of 12kN/2. Unit weight of soil is 16 kN/m³. The ground surface carries a surcharge of 20 kN/m², the factor of safety is 1.2 and the value of Nc = 5.7. The safe depth of foundation will be approximately.

Fundamentals of Geotechnical Engineering (MindTap Course List)

5th Edition

ISBN:9781305635180

Author:Braja M. Das, Nagaratnam Sivakugan

Publisher:Braja M. Das, Nagaratnam Sivakugan

Chapter17: Settlement Of Shallow Foundations

Section: Chapter Questions

Problem 17.2P: A 3 m 4 m footing, founded at 2 m depth in a clay, applies a net pressure of 200 kN/m2. The bed...

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1- Depth of B.H ==> depth of borehole 2- Bearing capacity for the soil under the footing. ==> hansen equation 3- Immediate settlement for the soil under footing. ==> Si 4- Find the time required for 100% degree of consolidation
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A 1.8 m square, 2 m deep and 1 m high footing supports a column load of 570 kN. It is supported on a clayey sand. There is no water present at the site. Use unit weight for the concrete 24 kN/m³. A dilatometer test run at the site has returned the following constrained modulus profile: Depth (m) M (MPa) 2 7.7 3 8.8 4 5 10.2 14.8 6 15.4 Plot the modulus distribution with depth considering both the strain distribution with depth and the soil moduli, and divide soil into 5 layers, then determine the average modulus for each soil layer.
A footing of size 2m x 2m transferring a pressure of 200 kN/m2, is placed at depth of 1.5 m below the ground as shown in the figure (not drawn to the scale). The clay stratum is normally consolidated. The clay has specific gravity of 2.65 and compression index of 0.3. 200 kN/m? 1.5 m GWT Ya = 15 kN/m 18 kN/m elemiu 1 m Silty Sand Ysat = 10.5 m 1.5 m Clay Yat = 17 kN/m Dense Sand Consideration 2:1 (vertical to horizontal) method of load distribution and yw primary consolidation settlement (in mm, round off to two decimal places) of the clay stratum is 10kN/m, the
A 10 m * 30 m mat foundation is to be built on the surface of a 20 m thick layer of unsatu-rated silty sand. The silty sand is underlain by a stiff bedrock material. The water table is at a great depth. The silty sand is relative uniform and in situ testing indicates it has a constrainedmodulus of 19 MPa. The building applies a uniform stress of 50 kPa at the base of the mat.Compute the settlement under the center of the mat.
A water tank is required to be constructed with a circular foundation having a diameter of 20m founded at a depth of 2m below the ground surface. The estimated distributed load on the foundation is 300 kN/m². Assuming that the subsoil extends to a great depth and is isotropic and homogeneous, determine the stresses °z at points (i) z = 6m, r = 0, (ii) z = 6m, r = 10m, (iii) z = 20m, r = 0 and (iv) z = 20m, r= 10m, where r is the radial distance from the central axis. Use the Influence Diagram below to calculate the I. Neglect the effect of the depth of the foundation on the stresses. Influence value l, (x100) 0.1 1.0 10 100 1.25 1.5 1.0 1 2.5 3 0.0 0.25 0.5 0.75 3 Note: Numbers on curves indicate value of r/Ro 5 6. -B = 2R, mi HR 7 10 0, = 1.9 10 Fig. 1. Influence Diagram for the Vertical Normal Stress at Various Points Under a Uniformly Loaded Circular Area (Foster and Ahlvin, 1954) 4. 00 Depth z/Ro
subject: Geotechnical Engineeringbook: principle of foundation engineering - Braja M Das
1- Depth of BH. 2- Bearing capacity for the soil under the footing. ==> hansen method 3- Immediate settlement for the soil under footing. ==> Schmertmann's Method 4- Find the time required for 100% degree of consolidation
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Example 11 (TBEC 2018 section Z-I-2.1.): Reinforced concrete building with 6 floors and 1 basement will be constructed on a soil deposit with shear strength parameters of c, = 250 kPa and ou = 0°. Unit weight of the soil is given as 19 kN/m³. Depth of the foundation is 3.5 m and dimensions of the raft foundation is 14m x 19m. Under the static condition and with 1.4DL+1.6LL load combination, maximum foundation pressure is determined as 364 kPa whereas, in earthquake condition with 1DL+1LL+1E, maximum foundation pressure is given as 216 kPa. Calculate the ultimate bearing capacity by using General Bearing Capacity equations and determine whether the foundation is safe or not.
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