Download TBM Tunnelling in Jointed and Faulted Rock By Nick R Barton –

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 analyzesTBM tunnels that total ,km 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 asm hr for several months It also covers logging methods, empirical TBM tunnel support design, and numerical verification of support