Method and system for ground recognition in front of an excavating machine

摘要

Electrical soil resistivity may be measured by injecting a measured (16) current into electrodes (14A) and measuring the voltage (18) between two further electrodes (14B). These measurements are made at the immediate cutting face of the tunnelling machine and at distances in front of it's path. Measurements are also made of cutting tool pressures and these may then be forecast using the comparison of the near and far electrical soil resistivities. A data processing equipment is used to provide iso-resistivity maps for horizontal and vertical planes and continuous forecasts of tool pressure.