Summary of surface vertical displacements and settlement troughs for the TBM1 passage (westbound construction, period 2)
| Z-line SMPs | Extensometer reference heads | Y-line SMPs | X-line SMPs | Remarks | |||||
|---|---|---|---|---|---|---|---|---|---|
| Longitudinal trough | |||||||||
| Relative displacement w/wmax when xf = 0 m | 24% | 36% | 30% | 30% | |||||
| x50%: m | 7·9 | 5·3 | 7·8 | 6·4 | x50% = xf when w/wmax = 50% | ||||
| Longitudinal trough length factor, ix: m | 12·4 | 12·4 | 11·2 | 12·6 | 2ix = x86%–x14% x86% = xf when w/wmax = 86%; x14% = xf when w/wmax = 14% | ||||
| Trough length parameter, Kx | 0·36 | 0·36 | 0·32 | 0·37 | Kx = ix/z0 | ||||
| Transverse trough | |||||||||
| Maximum vertical displacement, w: mm | −5·1 | −5·8 | −5·6 | −8·3 | |||||
| Location of maximum displacement | ZSMP5 (y = −0·2 m) | HP20 (y = 0·0 m) | YSMP12 (y = 2·5 m) | XSMP15 (y = 1·05 m) | |||||
| South | North | South | North | South | North | South | North | ||
| Transverse trough width factor, iy: m | N/A | 13·0 | 13·6 | 11·6 | 13·7 | 15·1 | 15·0 | ||
| Trough width parameter, Ky | 0·37 | 0·39 | 0·34 | 0·40 | 0·44 | 0·44 | Ky = iy/z0 | ||
| Volume loss, VL | 0·47% | 0·49% | 0·40% | 0·48% | 0·78% | 0·78% | VL obtained from best-fit Gaussian curves | ||
| Overall volume loss, VL: % | 0·48% | 0·44% | 0·78% | ||||||
| Ky/Kx | N/A | 1·03 | 1·08 | 1·06 | 1·25 | 1·19 | 1·19 | ||
| Z-line SMPs | Extensometer reference heads | Y-line SMPs | X-line SMPs | Remarks | |||||
|---|---|---|---|---|---|---|---|---|---|
| Relative displacement | 24% | 36% | 30% | 30% | |||||
| 7·9 | 5·3 | 7·8 | 6·4 | ||||||
| Longitudinal trough length factor, | 12·4 | 12·4 | 11·2 | 12·6 | 2 | ||||
| Trough length parameter, | 0·36 | 0·36 | 0·32 | 0·37 | |||||
| Maximum vertical displacement, | −5·1 | −5·8 | −5·6 | −8·3 | |||||
| Location of maximum displacement | ZSMP5 ( | HP20 ( | YSMP12 ( | XSMP15 ( | |||||
| South | North | South | North | South | North | South | North | ||
| Transverse trough width factor, | N/A | 13·0 | 13·6 | 11·6 | 13·7 | 15·1 | 15·0 | ||
| Trough width parameter, | 0·37 | 0·39 | 0·34 | 0·40 | 0·44 | 0·44 | |||
| Volume loss, | 0·47% | 0·49% | 0·40% | 0·48% | 0·78% | 0·78% | |||
| Overall volume loss, | 0·48% | 0·44% | 0·78% | ||||||
| N/A | 1·03 | 1·08 | 1·06 | 1·25 | 1·19 | 1·19 | |||