Assignment Task -             
    

Question 1 
Figure 1 shows the plan of a raft foundation of a building cast at ground level. A sewer pipe is located at a depth of 4 m below the ground level and at a distance of 3 m from the corner of the raft foundation as shown in Figure 1 below. The raft foundation carries a uniform pressure on the soil below. The soil profile at the site is given in  Table 1. Your assigned values of the uniform pressure and Young’s modulus of soil are given in Table 3. Uniform pressure (q)= 140kPa, Young's modulus of sand E’1=  14MPa, Young’s modulus of alluvial clay E'2 = 4 MPa 
Calculate: 
a) The vertical stress increase at point A on top of the pipe using Fadum’s (1948)  method. 

b) The vertical stress increase at a depth of 5 m below the centre of the raft foundation (point B in Figure 1) using Newmark’s (1942) chart. Assume that the influence factor for Newmark’s chart (IN) is equal to 0.005. 

c) Calculate the total settlement under the center of the raft foundation (point B in  Figure 1).  


Table 1: Soil profile 
Soil type 
Depth (m)
Sand 
Alluvial Clay 
Gravel 
0 - 10
10 - 14
>10

 

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  • Uploaded By : Roman
  • Posted on : February 01st, 2019

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