Abstract
An automatic control system for maintaining the working face stability of a "soil pressure shield machine" has been developed. This machine is particularly suited to tunnel constructions under unstable grounds. At first, the stability conditions and mathematical modelling of the working face are discussed. It is found that the best method of control is to correct the error in soil amount by soil pressure signals. An analogue simulation model for the total system is made, and system response characteristics are analyzed for various values of each parameter. An actual system is designed and manufactured according to the results of the above simulation, and is proved to have the expected performance. Putting its field operation data into the abovementioned simulation model, the model is verified to be reasonable and the values of the unknown constants are quantitatively estimated.
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