Unformatted text preview: immediately). (a) (b) Figure Q4.6: distributions of (a) pore water pressure and (b) excess pore water pressure (with hydrostatic or steady state component subtracted) with depth (d) Consider an element of soil of thickness δ z at a depth z below the excavated surface. The compression of this element is δρ , given by = ( Δσ ' v /E' ). z as by definition E' 0 = ' v / Δε v and v = δρ/δ z Now, E' 0 = (5000 + 4000z) kPa and the eventual increase in vertical effective stress ' v at depth z is equal to the reduction in pore water pressure at the same depth, ' v = 10z (ignoring friction on the sheet piles). Hence the total settlement ρ is given by...
View
Full Document
 Fall '11
 StuartChalk
 Analytical Chemistry, Aquifer, water table

Click to edit the document details