TUNNELLING IMPACTS | TECHNICAL
Below, figure 5 Example charts (all units in m) showing a thrust line analysis of a 2m ID circular masonry sewer (0.6m thick, 8m depth to axis, 2.5MPa ULS masonry compressive strength) with various horizontal stresses to vertical stress ratios (KT)
2.0 1.5 1.0 0.5 0.0
-0.5 -1.0 -1.5 -2.0
2.0 1.5 1.0 0.5 0.0
-2.0 -1.5 -1.0 -0.5 0.0 0.5 1.0 1.5 2.0 Intrados Intrados 1/3 Extrados Extrados 1/3 Thrust line
(a) KT
2.0 1.5 1.0 0.5 0.0
-0.5 -1.0 -1.5 -2.0
= 0.5 (Middle-third Envelopes)
2.0 1.5 1.0 0.5 0.0
-2.0 -1.5 -1.0 -0.5 0.0 0.5 1.0 1.5 2.0 Intrados Intrados 1/3 Extrados Extrados 1/3 Thrust line
(c) KT
2.0 1.5 1.0 0.5 0.0
-0.5 -1.0 -1.5 -2.0
= 0.7 (Middle-third Envelopes)
2.0 1.5 1.0 0.5 0.0
-2.0 -1.5 -1.0 -0.5 0.0 0.5 1.0 1.5 2.0 Intrados Intrados 1/3 Extrados Extrados 1/3 Thrust line
(e) KT = 1.1 (Middle-third Envelopes)
-0.5 -1.0 -1.5 -2.0
-0.5 -1.0 -1.5 -2.0
-0.5 -1.0 -1.5 -2.0
-2.0 -1.5 -1.0 -0.5 0.0 0.5 1.0 1.5 2.0 Intrados Intrados ULS Extrados Extrados ULS Thrust line
(b) KT = 0.5 (ULS Envelopes)
-2.0 -1.5 -1.0 -0.5 0.0 0.5 1.0 1.5 2.0 Intrados Intrados ULS Extrados Extrados ULS Thrust line
(d) KT = 0.7 (ULS Envelopes)
-2.0 -1.5 -1.0 -0.5 0.0 0.5 1.0 1.5 2.0 Intrados Intrados ULS Extrados Extrados ULS Thrust line
(f) KT = 1.1 (ULS Envelopes)
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