Simple Shear Test on Sand Reinforced by Continuous Fibers

Anisotropy of sand reinforced by continuous fibers is investigated by simple shear tests and box shear tests. Tests are performed on the sand samples mixed with fibers which have differ­ent angles of deposition, a, of o· to 180° . From the simple shear tests it is found that the di­rections of the minor principal strain to the horizontal converge to about 50° irrespective of the angle of deposition of the specimen. The highest shear resistance is obtained for the specimen with a of 45° to 60° , in which direction the largest tensile strain is induced. Al though the strength is highest when a is 90° in the shear box tests, the results obtained by two test series show reasonably good correspondence in terms of the predominant direction of fibers to the failure plane.