Cut-Off Wall Design for Active Landfills
Malcolm Drilling designed a cut-off wall test section with an embedded HDPE membrane to provide permeability on the order of 10-8 cm/sec around an active landfill. The site is located within a seismically active zone.
A hydraulic clamshell bucket suspended from one of our dual-cycle cranes was chosen to excavate the 140-foot-deep diaphragm wall. Their crews assembled the HDPE membrane using a custom-built delivery system. Panel joints were formed between primary and secondary panels, utilizing a special connection through the HDPE membrane to mitigate infiltration and seepage of groundwater.
The subsurface material consisted of fill underlain by low plasticity clay with interbedded layers of well-graded sand and silt.