CONSOLIDATION BEHAVIOR OF CLAYEY SOILS UNDER RADIAL DRAINAGE

For Barren's degree of consolidation, U-r, versus the time factor, T-r , relationship for soils undergoing consolidation with radial drainage for the equal vertical strain condition, a simple method has been dev eloped to determine the value of the coefficient of consolidation with radial drainage c(r). Theoretical log(10)(d(e)(2)/t) versus U-r curve s where d(e) is the diameter of influence and r is the real time for t he different known value of c(r) have been generated. A method has bee n developed wherein both the theoretical and experimental behaviors of soils undergoing consolidation with radial drainage can be simultaneo usly compared and studied on the same plot. The experimental log(10)(d (e)(2)/t) versus U-r curves have been compared with the theoretical cu rves. Effects of initial compression, secondary compression, and durat ion of load increment are studied. Simple procedures are presented for calculating the values of c(r) using the experimental log(10)(d(e)(2) /t) versus U-r curves. A comparative study of the coefficient of conso lidation and the coefficient of permeability between the cases of vert ical and radial drainage has been done.