Down-the-hole unbalance vibration exciter for seismic treatment of bottom-hole zone
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The down-the-hole unbalance vibration exciter with the pneumatic drive is designed to treat face zone in the seismic frequency range. The modular-type source consists of a vibration generator with the automated stepped static moment variation, a hold-down unit and an in-built pneumatic percussive device to advance the facility in uncased holes. The article gives pilot test data on R&D model of the vibration exciter, and amplitude–frequency characteristic and spectral content of the excited signal.
KeywordsDown-the-hole seismic source vibrational impact rock mass seismic vibration spectral content
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