Centrifugal model tests on stability of maritime dams constructed by geobag-solidified soil

The technology of maritime dams constructed by geobag-solidified soil saves the increasingly scarce sand and gravel resources and solves the problem of disposal of slag and dredged spoil. It has broad application prospects. Relying on a maritime dam project in Tianjin Port, the centrifugal model tests are carried out to study the overall stability and deformation of the maritime dam filled with solidified soil using slag and dredged spoil as the main raw materials, and the variation laws of soil pressure and pore water pressure in the foundation are analyzed. The test results show that the settlements of the maritime dam constructed by geobag-solidified soil and the foundation mainly occur during the filling period, and the settlement rate is large. Within the scope of the maritime dam, the settlements are distributed in a bell shape, which are large in the middle and small at both sides. Seen from the settlement curve of the mud surface at the toe of the maritime dam and the dissipation of pore water pressure, under the normal conditions, the maritime dam filled with solidified soil and the foundation can remain stable. The instability failure of the maritime dam filled with solidified soil as well as that of the foundation is now a circular sliding one. The deformation is mainly settlement, and the horizontal displacement is small. The geotextile bag has a strong constraint on the horizontal deformation of the maritime dam. The safety factor of stability obtained through the centrifugal model tests is 1.59.