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Experimental Observations of Shear Patterns in Direct Shear Tests

机译：直剪试验中剪切模式的实验观察

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A series of simple experiments were performed using direct shear apparatus in order to study the rupture patterns in sands. Measurements of internal displacements were made by observing with X-rays the positions of lead shot placed in a regular array within the sample. Shear displacement was applied manually and radiographs were taken after each increment of horizontal movement in order to observe the incremental strain field. The sand used was 30/52 Leighton Buzzard sand with a grain size between 0.3mm and 0.5mm. It was concluded that, while caution should be exercised in extrapolating the results of these low stress tests, the results matched some theoretical estimates for the orientation of shear bands. It was suggested that characteristic lengths and thicknesses of shear bands might be related to the average particle size of the sand.

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