Accession Number:

AD0731707

Title:

Excavation Seismology.

Descriptive Note:

Semiannual technical rept. no. 1, 19 Feb-18 Aug 1971

Corporate Author:

HONEYWELL INC ST PAUL MN RESEARCH DEPT

Report Date:

1971-09-01

Pagination or Media Count:

135.0

Abstract:

The objective of the program is to develop seismic techniques and equipment which can be used in a hard-rock rapid-excavation system to provide indication of potentially hazardous or changing geologic conditions ahead of the working face. The seismic reflection method is considered the most suitable one for the application. The principal technical problem is identification of reflections superimposed on other source-produced coherent interference. Signal processing techniques such as cross-correlation and velocity filtering or beamforming using an array of receiving sensors are being investigated for enhancement of reflections. The initial part of the program was emphasized the development of a seismic sourcereceiver combination which produces a simple, repeatable transmitted seismic pulse. A field recording system has been assembled and seismic signals recorded and digitized for reflections from free surfaces on granite blocks using a single receiver at various locations to simulate an array of receivers. The digitized signals will subsequently be processed by digital computer to simulate and assess signal processing techniques.

Subject Categories:

  • Civil Engineering
  • Seismic Detection and Detectors

Distribution Statement:

APPROVED FOR PUBLIC RELEASE