Unit Cell Testing of Reinforced Soils - Reinforced Soil Engineering: Advances in Research and Practice - page 40

Figure 3 Relationships between initial confining pressure and equivalent confining
pressure increase. (From Yang, 1972.)
and sand if the amount of reinforcement is relatively large, or (2) the excessive
lateral deformation at the mid-height of specimen.
2 REINFORCED SANDS
The studies described in Sec. 1 were mainly for understanding the fundamental
mechanism of soil reinforcement; they chiefly dealt with the effects of spacing
and initial confining stress on the strength of the reinforced specimen. With the
development of polymeric fabric, the study has tended to focus on geotextiles,
both woven and nonwoven, and geogrid. This section gives a brief discussion of
experimental work on sand reinforced with geotextile by means of triaxial
compression tests (e.g., Broms, 1977; Holtz et al., 1982), plane strain
compression tests (e.g., McGown and Andrawes, 1977; Tatsuoka, 1986a), and
direct shear tests (e.g., Gray and Ohashi, 1983; Jewell and Wroth, 1987;
Shewbridge and Sitar, 1989).