The advance rate and the pressure maintained by an EPB (Earth Pressure Balance) TBM are closely linked. The EPB TBM's primary function is to maintain face stability by balancing the pressure exerted by the machine with the earth and water pressure acting on the tunnel face. The rate at which the TBM advances directly influences the volume of soil being excavated and the pressure required to support the face. If the advance rate increases, the TBM needs to excavate more soil per unit of time. To mai....
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