DEVICE FOR MONITORING COLLAPSE OF NATURAL GROUND IN UNDERGROUND EXCAVATOR.

摘要

PURPOSE: make it possible to monitoring activity ground check its collapse it is with high accuracy, by selection shielding continuously with the more power electrodes of at least three combination and detecting electrode and determine resistivity about cave in section substitute into equation determine value entrance, to calculate the muddy water of thickness. ;CONSTITUTION: being equipped with electrode adapter unit 13, detects one by one in at least three different group contract source electrode and detecting electrode selection. Moreover, power supply 17 and voltmeter continuously change, to connect for each group of merging. Each collapsed portion 24 that specific resistance value is chosen calculates CPU 20. On the other hand, resistivity and current electrode span is selected continuously to change relationship between field equation for each combination, it illustrates value specific resistance calculated and also span true resistance rate of the range of choice from 1 to 8 between current electrode mud section 23 natural 22 collapsed portion 24 of basis of constriction 24 and true resistance rate thickness and muddy water, thus at least three equations. The calculating of the muddy water of the thickness is based on equation. ;COPYRIGHT:(C) 1994, JPO& Japio