Unit Cell Testing of Reinforced Soils - Reinforced Soil Engineering: Advances in Research and Practice - page 59

Figure 13 Stress-strain relationships of reinforced clay: (a) undrained and (b) drained
tests. (From Murata et al., 1991.)
premature failure. However, when a permeable geotextile is used, this pore
pressure is evenly distributed in the specimen and, therefore, the strength is
enhanced.
3.3 Anisotropically Consolidated Plane Strain Compression
Tests
All above triaxial and plane strain compression tests on a reinforced cell unit
were conducted on isotropically consolidated specimen. The isotropic
consolidation generated compression along the axial direction of reinforcement
and thus inhibits its function as tensile reinforcement until lateral tensile strain is
remobilized. This strain path is in contradiction to field conditions.
Ling (1993) and Ling and Tatsuoka (1994) conducted a series of plane
strain compression tests on a silty clay that has been consolidated isotropically
and anisotropically, under both drained and undrained conditions. The test setup
is shown in Fig. 14a, and three different types of reinforcement and initial stress
ratios were used. The results for undrained and drained tests are shown in Figures
14b and c, respectively. A smaller initial stress ratio and large reinforcement