This practical guide describes the stage-by-stage development of
a method for predicting the penetration rate (PR) and the advance
rate (AR) for tunnel boring machines based on an expanded version
of the Q-value, QTBM. The author analyzes 145 TBM tunnels that
total 1,000km in length. He then develops simple formulae to
estimate PR and AR from the QTBM value and to back-calculate QTBM
from performance data. The book quantitatively explains actual
advance rates as high as five m/hr for one day or as low as 0.005
m/hr for several months. It also covers logging methods, empirical
TBM tunnel support design, and numerical verification of
support.
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