Accession Number:

AD0730446

Title:

Applied Research on Hydraulic Disintegration of Rock for Rapid Excavation

Descriptive Note:

Semiannual technical rept. 3 Feb-3 Sep 1971

Corporate Author:

MINNESOTA UNIV MINNEAPOLIS ST ANTHONY FALLS HYDRAULIC LAB

Personal Author(s):

Report Date:

1971-09-01

Pagination or Media Count:

17.0

Abstract:

A method of disintegrating rock at rates suitable for rapid excavation is examined. The method employs high velocity water slugs to generate strong elastic water-hammer type pressure pulses at the instant of impact between the water and the rock. Test slugs of up to one half pound weight with speeds up to 800 ftsec are projected at a target. The character of the slug at impact is examined with high speed photographs and the character of the delivered pressure pulse is measured with a quartz transducer mounted in a metal target. Tests to date show developed pressures of a useful magnitude and duration. The magnitude approximates that generated by a simple water hammer. Planned tests on a variety of rock samples will evaluate the response and erosive losses of the rock for selected slug firings.

Subject Categories:

  • Geology, Geochemistry and Mineralogy
  • Civil Engineering

Distribution Statement:

APPROVED FOR PUBLIC RELEASE