Theoretical and Experimental Investigation into the Basic Properties of Boulder Clay

摘要

Five soils, with liquid limits in the range 25 to 75, were subjected to pulsed deviator stresses applied in increments until a limiting permanent deformation was reached, or alternatively an axial stress of 18 p.s.i. was sustained without failure within 100,000 stress applications. Resilient moduli, covering a practical range of moisture contents and densities, were determined for each soil. The threshold stress, which separates the regimes of mainly elastic from the inelastic behaviour was established by an analytical procedure. The application of the threshold stress concept to flexible pavement performance is discussed. The compaction characteristics and the C.B.R. vs moisture content and density relationships were determined, and were correlated where practicable with the results of the repeated load tests. Conventional shear tests, slow undrained triaxial and unconfined compression, were performed. These test results are reported in abbreviated form. (Author)