The objective of this research project was to develop inhole geophysical measurement techniques for assessing geologic and hydrologic conditions ahead of tunnels constructed by rapid excavation methods. The research plan was to perform preliminary research, design and develop specifications for instrumentation, contract with custom equipment manufacturers for its fabrication, and test, evaluate and describe in reports its field applicability. Measurement techniques developed and tested include: magnetic susceptibility, electrical resistivity, acoustic waveform, bulk density, oriented 3-point caliper, 3-point resistance, and temperature. (Modified author abstract).

The objective of this research project was to develop inhole geophysical measurement techniques for assessing geologic and hydrologic conditions ahead of tunnels constructed by rapid excavation methods. The research plan was to perform preliminary research, design and develop specifications for instrumentation, contract with custom equipment manufacturers for its fabrication, and test, evaluate and describe in reports its field applicability. Measurement techniques developed and tested include: magnetic susceptibility, electrical resistivity, acoustic waveform, bulk density, oriented 3-point caliper, 3-point resistance, and temperature. (Modified author abstract).