NATURAL GROUND EVALUATION METHOD IN TUNNEL EXCAVATION AND EQUIPMENT THEREFOR

摘要

PROBLEM TO BE SOLVED: To provide a natural ground evaluation method capable of always monitor and evaluate the situation of the natural ground of facing without affecting the execution of work such as a stop of belt conveyor in a tunnel excavation using TBM.;SOLUTION: A weighting controller (2) is arranged below a belt conveyor (1) carrying muck (Z) excavated by a tunnel boring machine, the weight of the muck (Z) to be carried is measured continuously, the moving speed of the belt conveyor (1) is measured, the amount of muck excavated per unit time is measured from the measured value of the weight of muck carried, a change in the amount of excavated muck per unit time is always monitored relative to the amount of the moving forward of the tunnel boring machine, and a place where the value suddenly changes relative to the amount of moving forward of the boring machine is evaluated as a defective place in the natural ground situation where there are symptoms is the occurrence of the ruptures or fallings.;COPYRIGHT: (C)2002,JPO