TBM Telemetry — Drive Duration with Learning Curve
Drive Duration with Learning Curve for tunnel project performance management.
Every TBM drive starts slow — crew, systems and ground teach each other for 6–10 weeks, and schedules that draw a straight line from day one slip exactly the 'lost metres' this computes. Veteran planners bid the learning curve explicitly; optimists discover it.
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.
Drive Duration with Learning Curve for tunnel project performance management. A free tbm performance & tunnelling tool — no sign-up, no upload, instant results in your browser.
About TBM Telemetry — Drive Duration with Learning Curve
TBM Telemetry — Drive Duration with Learning Curve computes the governing relationship duration = learn months + (L − learn advance)/steady rate live as you type. Every TBM drive starts slow — crew, systems and ground teach each other for 6–10 weeks, and schedules that draw a straight line from day one slip exactly the 'lost metres' this computes. Veteran planners bid the learning curve explicitly; optimists discover it. 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 — Drive Duration with Learning Curve
- 1Enter your values — Drive length, Steady-state advance, Learning period, Learning-period performance (sensible defaults are pre-filled).
- 2Read the live results: Drive duration, Metres 'lost' to learning.
- 3Check the "with your numbers" line to see duration = learn months + (L − learn advance)/steady rate substituted step by step.
- 4Adjust inputs until the scenario matches yours, then copy or share the result.
Why use TBM Telemetry — Drive Duration with Learning Curve?
- ✓Instant, free and private — every calculation runs client-side in your browser; nothing is uploaded
- ✓Built on the stated formula duration = learn months + (L − learn advance)/steady rate 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)
- ✓Every TBM drive starts slow — crew, systems and ground teach each other for 6–10 weeks, and schedules that draw a straight line from day one slip exactly the 'lost metres' this computes.
- ✓Niche-specific defaults give a meaningful worked answer the moment the page loads
Frequently asked questions
What formula does the tbm telemetry — drive duration with learning curve use?+
It evaluates duration = learn months + (L − learn advance)/steady rate, 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?+
Every TBM drive starts slow — crew, systems and ground teach each other for 6–10 weeks, and schedules that draw a straight line from day one slip exactly the 'lost metres' this computes. 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?+
Drive Duration with Learning Curve for tunnel project performance management. A free tbm performance & tunnelling tool. Veteran planners bid the learning curve explicitly; optimists discover it. 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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