= 7.1 A foundation for a long concrete block wall of thickness 0.2 m (8 in.) will be founded on a dense sand ( from direct shear test = 32°; D,= 85% and Ysat 17.8 kN/m³ (113 pcf)). The wall will transmit a vertical live load load of 60 kN/m (4000 lb/ft) in addition to the estimated foundation dead load of 7.5 kN/m (500 lb/ft). The foundation is to be located 0.5 m (1.5 ft) below finished grade. The groundwater level is 5 m (16 ft) below finished grade. Determine the size of the foundation (width) using ASD for FS 3. Investigate the effects of a rise of the groundwater to (a) the ground surface and (b) the foundation base.

= 7.1 A foundation for a long concrete block wall of thickness 0.2 m (8 in.) will be founded on a dense sand ( from direct shear test = 32°; D,= 85% and Ysat 17.8 kN/m³ (113 pcf)). The wall will transmit a vertical live load load of 60 kN/m (4000 lb/ft) in addition to the estimated foundation dead load of 7.5 kN/m (500 lb/ft). The foundation is to be located 0.5 m (1.5 ft) below finished grade. The groundwater level is 5 m (16 ft) below finished grade. Determine the size of the foundation (width) using ASD for FS 3. Investigate the effects of a rise of the groundwater to (a) the ground surface and (b) the foundation base.

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

See similar textbooks

Similar questions

A foundation carries uniform loads as shown. Determine the value of w (in kN/m). W (kl/m) twet wet wo tuzt wat
A permanent load of 2500kN and an imposed load of 1250 kN are to be supported on a square pad foundation at a depth of 1.0 m in a deposit of gravelly sand extending from the surface to a depth of 6.0 m. A layer of clay 2.0 m thick lies immediately below the sand. The water table may rise to foundation level. The unit weight of the sand above the water table is 17 kN/m3 and below the water table the saturated unit weight is 20 kN/m3. Characteristic values of the shear strength parameters for the sand are c = 0 and ϕ = 38 . The coefficient of volume compressibility for the clay is 0.15m2/MN. It is specified that the long term settlement of the foundation due to consolidation of the clay should not exceed 20 mm. Using the Working Stress Design Approach with Fs = 2.5, determine the foundation size to safeguard against bearing capacity failure and excessive settlement
For the square footing (1.5mx1.5m) shown in Figure (Q5), Find the total settlement (elastic and consolidation) at the center of the foundation. Use the approximate method to compute the stress increase. WST 3.5m Figure (Q5) 1000 KN 1.5m*1.5m Y-18 kN/m² Ya 19 kN/m² E, -40 MPa H.= 0.25 Y Y E, -50 MPa, M. = 0.3 C = 0.3, C, = 0.04 -90 kN/m², e. - 0.8 = 20 kN/m² 10 kN/m² Rock
A sandstone bed with RQD = 70% and y = 26.0 kN/m³ lies beneath 1.5 m of overburden soil. A 2.0 m X 2.0 m square foundation is to be placed on top of the sandstone rock (i.e., at a 1.5 depth below the ground level) to carry a column load. The unit weight of the soil is 18.0 kN/m³. Assuming the rock strength parameters from Problem 7.17,
A circular footing of 1.5 m radius transmits a uniform pressure of 90 kN/m². The vertical stress at a point 3 m directly beneath it's center is A 26 kN/m² B 72 kN/m² C 54 kN/m² D 90 kN/m²
3decimal places on final answer
A 2.0 m wide continuous foundation is placed at 1.5 m depth in a saturated clay where cu = 40 kN/m2 and γ = 17 kN/m3. At 2.0 m below the ground level, this clay layer is underlain by a stiffer clay where cu = 60 kN/m2 and γ = 18 kN/m3. What would be the maximum wall load allowed with FS = 4?
Q3- A raft foundation (12 * 8) m carrying a net pressure of 183 kN/m² is located at a depth of 3.8 m below the surface in deposit of dense sandy gravel 6 m deep. The water table is located at a depth of 4.3 m. Below the sandy gravel is a layer of clay 3.8 m thick which in turn is underlain by dense sand. The value of mv for the clay is 0.28 m²/MN. Determine the settlement below the center and below the corner of the raft due to consolidation of the clay.
Considering that the horizontal thrust from the back of a 5.5 m wide brick wall to the 1 m deep part of the wall is H = 55 kN a) Find the greatest stress in the base when b = 2 m.b) Find the width b so that there is a shrinkage zone at the base.(Note: unit weight of brick wall ỿ = 24 kN / m3 ) Answer: ϭmax=0,30 Mpa, b=2,23 m
A square shallow foundation is located at depth of 1 m, in stronger sand. A softer sand layer is located at a depth of 3 m measured below the ground surface. H= 5.0 m and K, 4.0. Find B to carry the 4000 kN load using a factor of safety FS = 3. Assume that the bearing capacity of the top layer exceeds the ultimate bearing capacity. %3D Notes: For the top sand layer, unit weight= 14 kN/m'; d' = 30°. For the bottom sand layer, unit weight=11 kN/m2; d'= 22°.
Calculate the increase in the vertical stress at A due to the two line loads acting on the footing as given in the figure.
Subject: Geotechnical engineering Answer must be 4.95mm