A Rapid Method Of Determining in-situ CBR Values

Synopsis The Paper relates how difficulties in using the CBR test led to the trial of two other types of soil bearing test in an effort to reduce the time taken to determine the bearing capacity in situ of an area of soil. Preliminary trials showed one of these, the 3-in. plate failure load test, to possess potentially satisfactory performance. Further experiments showed that the relationship: log10 (CBR) = 0·76837 log10 (plate load in lb.) – 1·64422 exists. When applying this in field work it should be remembered that the 3-in. plate measures the CBR value at a different depth below the surface from the CBR plunger. Nous exposons ci-dessous comment des difficultes dans l'emploi de l'essai CBR nous a menes a l'epreuve de deux autres methodes de determiner la force portante du sol afin de reduire le temps necessaire pour determiner la force portante d'un perimetre de terrain in situ. Des essais preliminaires ont demontre que l'un d'entre ceux-ci, l'essai de charge de rupture sur un cercle de 3 pouces, a un...