Accession Number:

AD0733661

Title:

Comminution of Rock with Controlled Stress Waves.

Descriptive Note:

Technical note Oct 70-Jun 71,

Corporate Author:

NAVAL CIVIL ENGINEERING LAB PORT HUENEME CALIF

Report Date:

1971-10-01

Pagination or Media Count:

48.0

Abstract:

The study was initiated to prove a principle upon which to base the design of hard rock tunneling machines. The technique of interest involves trepanning a core and subsequent comminution of the core by controlled stress waves. To achieve the objective, exploratory explosive tests were performed in the laboratory on cylindrical specimens cast from Hydrostone. Instrumentation was installed on some of the specimens to record the dynamic radial strain resulting from the explosive detonation. Both visual and strain gage data showed that the specimens could be fractured in the desired manner. The thickness of the spalling was found to be directly related to the radial stress wave characteristics. Thus, the spall size should be controllable by changing the duration and magnitude of the wave. Author

Subject Categories:

  • Geology, Geochemistry and Mineralogy
  • Civil Engineering

Distribution Statement:

APPROVED FOR PUBLIC RELEASE