TBM Telemetry — Alignment Tolerance Burn
Alignment Tolerance Burn for tunnel project performance management.
TBMs never travel the theoretical alignment — they weave around it, and good steering keeps the weave inside ±50–100 mm. The trap is correcting LATE: a sharp correction stresses rings and gaskets (see the taper tool), so the trend line, not the current offset, is what the pilot watches.
Formula
Note: Planning-level tunnelling estimate — actual TBM performance is set by detailed geotechnical baseline data, machine design and the contractor's means & methods. Use for feasibility framing only.
Disclaimer: This tool is for general informational and estimation purposes only and is not professional financial, tax, accounting or legal advice. All figures are estimates — verify with a qualified professional before making decisions. Read the full disclaimer.
Alignment Tolerance Burn for tunnel project performance management. A free tbm performance & tunnelling tool — no sign-up, no upload, instant results in your browser.
About TBM Telemetry — Alignment Tolerance Burn
TBM Telemetry — Alignment Tolerance Burn computes the governing relationship projected = |offset| + trend × remaining/100 live as you type. TBMs never travel the theoretical alignment — they weave around it, and good steering keeps the weave inside ±50–100 mm. The trap is correcting LATE: a sharp correction stresses rings and gaskets (see the taper tool), so the trend line, not the current offset, is what the pilot watches. Defaults are pre-filled with realistic values for this exact scenario, and the worked example substitutes your numbers step by step so the math is never a black box.
How to use TBM Telemetry — Alignment Tolerance Burn
- 1Enter your values — Current offset from DTA, Contract tolerance, Drift trend, Drive remaining (sensible defaults are pre-filled).
- 2Read the live results: Projected offset if untouched.
- 3Check the "with your numbers" line to see projected = |offset| + trend × remaining/100 substituted step by step.
- 4Adjust inputs until the scenario matches yours, then copy or share the result.
Why use TBM Telemetry — Alignment Tolerance Burn?
- ✓Instant, free and private — every calculation runs client-side in your browser; nothing is uploaded
- ✓Built on the stated formula projected = |offset| + trend × remaining/100 with authoritative sources cited on the page (Maidl et al., Mechanised Shield Tunnelling, 2nd ed.; ITA/BTS — Mechanised tunnelling guidelines; NTNU prediction model — hard-rock TBM performance)
- ✓TBMs never travel the theoretical alignment — they weave around it, and good steering keeps the weave inside ±50–100 mm.
- ✓Niche-specific defaults give a meaningful worked answer the moment the page loads
Frequently asked questions
What formula does the tbm telemetry — alignment tolerance burn use?+
It evaluates projected = |offset| + trend × remaining/100, exactly as published. Sources: Maidl et al., Mechanised Shield Tunnelling, 2nd ed.; ITA/BTS — Mechanised tunnelling guidelines; NTNU prediction model — hard-rock TBM performance. The substituted worked example on the page lets you verify every step against the textbook.
How should I read the result — and how far can I trust it?+
TBMs never travel the theoretical alignment — they weave around it, and good steering keeps the weave inside ±50–100 mm. Planning-level tunnelling estimate — actual TBM performance is set by detailed geotechnical baseline data, machine design and the contractor's means & methods. Use for feasibility framing only.
When is this calculator the right tool for the job?+
Alignment Tolerance Burn for tunnel project performance management. A free tbm performance & tunnelling tool. The trap is correcting LATE: a sharp correction stresses rings and gaskets (see the taper tool), so the trend line, not the current offset, is what the pilot watches. For neighbouring scenarios, the related tools below cover the same engine with different presets.
Do I need to install anything or create an account?+
No. The tool is pure client-side JavaScript: open the page and it works, offline once loaded, with no account, no quota and no data leaving your device.
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