Feasibility study on the application of interlocking steel pipe sheet pile as hydraulic barrier of offshore waste landfill

Abstract

Steel Pipe Sheet Pile (SPSP) can be used for seawalls and vertical hydraulic barriers in offshore waste landfill. In this study, interlocking SPSP was developed, which features steel pipes as the main retaining elements and intermediary H-beams as the joint element in be-tween neighboring two steel pipes. A series of experimental tests have been performed to verify the performance of interlocking SPSP. The water cut-off performance of interlocking SPSP’s joint with different types of materials within a joint was evaluated by permeability tests. The equivalent hydraulic permeability of pre-deformation of joints was below 1.0×10-6 cm/sec when there is no structural damage of SPSP. It indicates that the interlocking SPSP can be effectively used as hydraulic barriers in offshore waste landfill.eams as the joint element in be-tween neighboring two steel pipes. A series of experimental tests have been performed to verify the performance of interlocking SPSP. The water cut-off performance of interlocking SPSP’s joint with different types of materials within a joint was evaluated by permeability tests. The equivalent hydraulic permeability of pre-deformation of joints was below 1.0×10-6 cm/sec when there is no structural damage of SPSP. It indicates that the interlocking SPSP can be effectively used as hydraulic barriers in offshore waste landfill.