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Assignment Task :

Assignment 4 - Soil Stability 

Problem Description 

A multistory factory is to be constructed on the ground shown in Fig. 1. As it can be seen from the figure, the ground consists of a 0.5m thick expansive clay layer sitting on a 2m thick coarse- grained sand layer. A deep silty clay layer is available below the coarse-grained sand layer. The water table is located 4.5 m below the ground surface and capillary heights of the two types of clays available in the ground are greater than 4.5 m. 

According to the conducted laboratory testing on representative soil samples obtained from the two clay deposits and sand deposit, the densities, at rest earth pressure coefficient and shear strength parameters of expansive clay, silty clay and coarse-grained sand

 

The Tasks to perform: 

1) Determine the total stress acting on the soil element under the natural ground condition (see Fig.1) and draw the relevant total stress Mohr Circle. 

2) Determine the total stress acting on the soil element after the proposed excavation (see Fig.2) and draw the relevant total stress Mohr Circle. 

If the building is to be constructed on a raft foundation that has 5 m × 5 m cross sectional area and the maximum anticipated stress coming from the building on its foundation is 400 kPa (see Fig. 3); 

3) Determine the increase in vertical stress applied on the soil element after the construction and draw the new total stress Mohr Circle. 

4) Comment on the suitable time to start the building construction (short term after the excavation or long term after the excavation). Explain the reason. 

According to the predictions, there will a 20 kPa pore water pressure reduction in the soil sample immediately after the proposed excavation and 50 kPa pore water pressure increment in the sample immediately after the proposed construction. 

5) If the proposed building construction will be carried out immediately after the excavation, draw the effective stress Mohr Circle for the soil element for immediately after the proposed building construction condition. 

6) Comment on the ground stability for the immediately after the proposed building construction condition with showing necessary steps you need to get that decision. 

7) Find the directions of failure planes and shear and normal stresses acting on those planes 

 

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  • Uploaded By : Grace
  • Posted on : June 08th, 2019

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