STRENGTH CHARACTERISTICS ON COMPOSITE SOIL CONSISTED OF CEMENT-MIXED AND COMPACTED SOILS IN SEPARATE LOADING TYPE DIRECT SHEAR TEST

摘要

In the reinforcement method by using the cement-mixed muddy soil for the fill type dam embankment, it is necessary to determine the zoning pattern to produce no an extremely large difference in strength between the reinforced zone by cement-mixed muddy soil and the existing embankment.In this paper, the direct shear tests duplicated the failure mode of the embankment reinforced with the cement-mixed muddy soil was performed to investigate the allowable strength difference between the reinforced zone and the existing embankment. From the experimental results, we suggested that the embankment reinforcing with the cement-mixed muddy soil is regarded as a composite soil if the reinforced zone strength τ_(CC) is approximately 3.0 times lower than or equal to the existing embankment strength τ_(S).