running sand

English

Noun

running sand (uncountable)

  1. (construction) Saturated sand which flows into an excavation or void due to water pressure.
    • 1946 January and February, “Notes and News: Demolition of Rhydyfelin Viaduct”, in Railway Magazine, page 53:
      During the construction of the viaduct, the sinking of the caissons in the river bed caused much difficulty to the engineer and contractors, as a bed of running sand was encountered; in consequence, the expenditure for these foundations proved almost prohibitive.
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