Settlement Calculation - Consolidation Test - Consolidation of Soil, Soil Mechanicses Agricultural Engineering Notes | EduRev

Soil Mechanics Notes- Agricultural Engineering

Created by: Mohan Singh

Agricultural Engineering : Settlement Calculation - Consolidation Test - Consolidation of Soil, Soil Mechanicses Agricultural Engineering Notes | EduRev

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Settlement Calculation

Figure 23.5 shows the e – log σv' plots for normally consolidated and overconsolidated clay for settlement calculation. For normally consolidated clay the settlement (S) can be determined as:

\[S={{{C_c}} \over {1 + {e_0}}}H{\log _{10}}\left( {{{{{\sigma '}_{v0}} + \Delta {{\sigma '}_v}} \over {{{\sigma '}_{v0}}}}} \right)\]                    (23.4)

where H is total thickness of the soil layer.

For over-consolidated clay:  Case 1: σ'v0+Δσ'v < σ'c

\[S={{{C_s}} \over {1 + {e_0}}}H{\log _{10}}\left( {{{{{\sigma '}_{v0}} + \Delta {{\sigma '}_v}} \over {{{\sigma '}_{v0}}}}} \right)\]                       (23.5)

Case 2: σ'v0 < σ'c < σ'v0+Δσ'v  

\[S={{{C_s}} \over {1 + {e_0}}}H{\log _{10}}\left( {{{{{\sigma '}_c}} \over {{{\sigma '}_{v0}}}}} \right)\]   +  \[{{{C_c}} \over {1 + {e_0}}}H{\log _{10}}\left( {{{{{\sigma '}_{v0}} + \Delta {{\sigma '}_v}} \over {{{\sigma '}_c}}}} \right)\]                           (23.6)

where Cs is the swelling index.

Settlement Calculation - Consolidation Test - Consolidation of Soil, Soil Mechanicses Agricultural Engineering Notes | EduRev

Fig. 23.5. Settlement calculation (a) Normally consolidated clay

               (b)  Overconsolidated clay .

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