Consolidation property of dredged soil mixed with discrete fiber

摘要

Consolidation property of dredged soil mixed with discrete fiber has been investigated by conducting consolidation tests. A small scale tests, i.e. standard consolidation tests and two kinds of large scale tests, i.e. laboratory model tests were carried out. One of the laboratory model tests was the consolidation test for the clay layer of 1m thickness, and vacuum pressure of -60kN/m~(2) was applied from the bottom end of clay layer. The other was the consolidation test for the clay layer with the same size, without consolidation pressure except self weight of the clay. In the test case of mixed soil of fiber content of 30% in dry weight, coefficient of consolidation increased to around 6-13 times of that of the original clay. Thus, it is expected by using the dredged soil mixed with 30% fiber that the installation spacing of prefabricated drains can be increased from 1.0m to 2.65m in square arrangement, by which quantities of the prefabricated drains will be minimized.