| Description |
viii, 62 leaves : illustrations ; 28 cm |
| Summary |
"The analysis of the direct or box shear test for determining the shear strength of a soil makes use of the assumption that the failure plane coincides with the plane of separation between the two halves of the box. Hvorsley, Roscoe, Hansen and others have theorized and experimentally shown that this is not always the case. The stress distributions on the failure plane, however it may be oriented, are not as uniform as generally assumed. This investigation was carried out to compare direct shear tests run on granular, air dry material where the failure was allowed to take place naturally to similar tests where the failure plane was forced to follow the plane of separation. A direct shear box, constructed of steel channel, was employed. Samples of angular crushed limestone and rounded river run gravel were each tested in the two manners described above. It was observed that the failure envelopes for each size of material tested indicated a lower angle of friction when the failure plane was forced to coincide with the plane of separation of the two halves of the box"--Abstract, leaf ii. |
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