Large-Scale Reinforced Clay Walls Backfilled with Clay at Cheng Kung University - Reinforced Soil Engineering: Advances in Research and Practice - page 187

Figure 3 Stress-strain relations for two reinforcements used for the NCKU walls.

The water content for each air-dried, 20-mm-thick layer was adjusted to the
optimumwater content condition. The spreading of soil and water was repeated for
five to six times to form a 120-mm-thick layer for compaction. The soil density and
water content were checked using undisturbed block samples during the
compaction. The result indicated that the quality control of the compaction work
was successful. A schematic view on the monitoring system is also shown in Fig. 1 .
The measurement of local tensile strains of reinforcement using
Wheatstone bridge has been double-checked using a precision Ohmmeter
based on the calibration method reported by Leshchinsky and Fowler (1990). In
the present study, the tensile strains measured using these two types of apparatus
were practically the same. Temperature effect on the output strain of
reinforcement was calibrated; output strain was investigated using a constant-
temperature chamber in the laboratory (Guo, 1995).