TUNNELLING IMPACTS | TECHNICAL


Below, figure 17: Example charts showing distortion, displacement and tensile strain profiles of a circular masonry sewer, which runs normal to the tunnel direction including assumed parameters


0.1 0.05 0 -0.05 -0.1 40 50 60 70 80 Vertical (z) Transverse Notation & Diametrical Distortion Profile


1.0 0.8 0.6 0.4 0.2 0.0 -0.2 -0.4 -0.6 -0.8 -1.0


0 30 60 90 120 150 180 210 240 270 300 330 360 Degree α (°)


δy δz δT δN 'Squatting Mode' - Distortion, Displacement & Tensile Strain Profiles


1.0 0.8 0.6 0.4 0.2 0.0 -0.2 -0.4 -0.6 -0.8 -1.0


0 30 60 90 120 150 180 210 240 270 300 330 360 Degree α (°)


δy δz δT δN 'Egging Mode' - Distortion, Displacement & Tensile Strain Profiles


1500 1250 1000 750 500 250 0


0 30 60 90 120 150 180 210 240 270 300 330 360 Degree α (°)


Tensile (Intrados) Tensile (Extrados)


1500 1250 1000 750 500 250 0


0 30 60 90 120 150 180 210 240 270 300 330 360 Degree α (°)


Tensile (Intrados) Tensile (Extrados) 90 100 110


Distance along sewer (m) Lateral (y)


Squatting 120 Egging 130 140 150 160


Excavated diameter (8m) Depth to axis (32m) Volume loss (1%) K = 0.5


February 2022 | 27


Displacement (mm)


Displacement (mm)


Diametrical distortion (%, -ve = squat; +ve = elongate)


Strain (με)


Strain (με)


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