Accession Number : AD0001700


Title :   EXPERIMENTAL INVESTIGATION OF THE BEHAVIOR OF SOIL UNDER A PUNCH OR FOOTING


Corporate Author : BROWN UNIV PROVIDENCE RI DIV OF APPLIED MATHEMATICS


Personal Author(s) : SYLWESTROWICZ, W


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/001700.pdf


Report Date : Jan 1953


Pagination or Media Count : 26


Abstract : Experiments are described which were designed to observe the 2-dimensional displacement field in the soil during the indentation of a punch or footing and also to construct the pressure-penetration curve relating the pressure of the punch into the soil. The experiments were conducted mainly with sand, although a few were performed by using a garden soil and the commercial modelling clay, Plasteline. A special container was constructed with removable side panels of 1/2-in.-thick glass. A grid system was produced on the side surface of the soil, and the deformation of grid system was observed and traced in the glass container. By taking photographs of different stages of the punch penetration and tracing from them the grid systems corresponding to each position of the punch, a displacement field was constructed and compared with that theoretically predicted. From the deformation of the grid system, some packing still appears to take place in the sand up to the maximum value of the pressure, although there is already present the movement of the sand in the directions which will produce the discontinuity layers in the next stage of deformation. The displacement field in the sand is in good agreement with the deformation field given by Shield (Mixed Boundary Value Problems in Soil Mechanics, to appear in Quart. Appl. Math.) and obtained as an alternative solution to Prandtl's solution. The increase in volume in the experiments seemed to correspond to the theoretical prediction which was computed for a very small movement of the punch, while the penetration was quite large in the experiments. Sand under the compression of a punch behaves differently than garden soil or Plasteline.


Descriptors :   *SOIL MECHANICS , LAYERS , DEFORMATION , DISPLACEMENT , SAND , SURFACES , MATHEMATICAL PREDICTION , BOUNDARY VALUE PROBLEMS , CONTAINERS , MIXING , SIDES


Subject Categories : Soil Mechanics


Distribution Statement : APPROVED FOR PUBLIC RELEASE