By Arul M. Britto, Michael J. Gunn
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Additional resources for Critical state soil mechanics via finite elements
Applying the trapezoidal rule (using one strip) gives the area as 32. The geometric interpretation of the trapezoidal rule is quite straightforward: the cubic curve is approximated as a straight line and the integral is equal to the area of the trapezium. 3 Analysis of Consolidation using Finite Elements 88 Sec. l) three times and solving the resulting equations. In fact one can write down the quadratic straight away as f(x) ~1 1' ~! I' ,d "1 ~\I~ I~. ). I~ I !! 1 /=/1 (X3 -X)(X2 -x) (X3 (X2 - X) (X I + /3 )!
5. The next section covers the mathematical preliminaries (numerical integration, interpolation polynomials, the approximate solution of differential equations and Green's theorem in the plane). 3 presents the fundamentals of the 'displacement' (or 'stiffness') method of finite element analysis via a simple example using linear elastic springs. 4 covers the virtual work principle. We include this section because we are aware that many engineers find the principle rather obscure . However, it turns out to be a very versatile and powerful tool in formulating finite element methods as well as the theory of structures.
In drained tests, one simply has a total stress path (equivalent to the ESP) inclined a t some other angle in the (p', q) plot, and it is a matter of simple geometry to calculate the intersection of the ESP with the CSL and the current yield locus. In undrained tests, although the total stress path will differ, the effective stress path remains the same . The calcula tion of the pore pressure in a test is again just a geometric exercise . Fig. ess strain behaviour of soils was first proposed by Drucker et al.
Critical state soil mechanics via finite elements by Arul M. Britto, Michael J. Gunn