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Title: Dynamic techniques for detecting and tracing tunnel complexes
Authors: U.S. Army Mobility Equipment Research and Development Center
Ballard, Robert F.
Keywords: Acoustic tests
Subsurface exploration
Geophysical survey
Drop hammer tests
Tunnel detection
Dynamic tests
Seismic investigations
Vibration response tests
Publisher: Soils and Pavements Laboratory (U.S.)
Engineer Research and Development Center (U.S.)
Description: Miscellaneous Paper
Abstract: The purpose of this investigation was to determine the feasibility of using various types of dynamic test techniques to detect and trace tunnel complexes. The terrain in the vicinity of the tunnels was flat to slightly rolling with pine tree forests. The predominant soil in the area was red clay. During the testing there was continuous rainfall accompanied by occasional high winds. The types of tests conducted were: vibratory tests, drop hammer tests, seismic tests, and acoustic tests. It was concluded that: (A.) Vibratory tests with a low power source were inconclusive for detection purposes. (B.) Drop hammer tests did not release enough energy to cause reverbration of an underground cavity, and are therefore not readily adaptable for detection. (C.) Acoustic tests are a feasible means of tracing tunnel complexes from the ground surface. It is recommended that further tests be performed to develop instrumentation and techniques of utilizing the acoustic method of tunnel tracing.
Rights: Approved for public release; distribution is unlimited.
Appears in Collections:Miscellaneous Paper

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