A method for detecting spring water in rock

摘要

PURPOSE:To detect and measure a distance to spring water from a face by determining a specific dielectric constant of a subsoil in front of the face as calculated from a propagation time of an electromagnetic wave reflected from spring water within the subsoil and a propagation time of a surface propagating wave. CONSTITUTION:A high frequency amplifier 8 is controlled to have a gain so that a pulse-like electromagnetic wave is transmitted ahead of a face at a specified interval from a transmitter 1 while a receiver 2 can be operated to receive reflected wave from a spring water (n) at a cracked part or a joint face and a surface propagating wave propagated near the surface of the subsoil (m) ahead of the face among electro magnetic waves after a subsoil is excavated and muck is carried out. A distance is measured to the spring water (n) at the cracked part or the joint face by a specified simple formula according to the propagation time of the reflected wave and a specific dielectric constant calculated from the surface propagating wave of the subsoil (m). Thus, the spring water at the cracked surface or the joint face within the subsoil can be detected qucikly and effectively while the distance to the spring water can be measured thereby achieving safe excavating work and an effect for shortening work term and lowering expense.