geotextile

geo- +‎ textile

geotextile (plural geotextiles)

1. Any strong, permeable fabric used in earthworks for any of a number of purposes, including separation of soil layers, filtering, reinforcing, erosion protection and protection of drainage pipes from clogging.
   • 2014 August 24, Jeff Howell, “Home improvements: gravel paths and cutting heating bills [print version: Cold comfort in technology, 23 August 2014, p. P5]”, in The Daily Telegraph (Property)‎:

     You need to excavate and remove the topsoil, line the subsoil with a geotextile, then lay and compact hardcore.

   • 2022 March 23, Philip Haigh, “Network News: Carillion changed the design of Carmont's drains”, in RAIL, number 953, page 9:

     The design also included geotextile lining of the trench in which the drainage pipe was buried.