TBM Advance Rate — Soft Clay (EPB)
Daily and weekly advance for a TBM in soft clay (epb) from penetration, RPM and utilization.
EPB machines in clay aren't cutting — they're extruding a controlled mudflow while holding face pressure. Penetration per rev is huge, RPM low, and advance is gated by ring-build and muck logistics, not the ground.
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.
Daily and weekly advance for a TBM in soft clay (epb) from penetration, RPM and utilization. A free tbm performance & tunnelling tool — no sign-up, no upload, instant results in your browser.
About TBM Advance Rate — Soft Clay (EPB)
TBM Advance Rate — Soft Clay (EPB) computes the governing relationship ROP = pen × RPM × 60/1000; AR = ROP × hours × utilization live as you type. EPB machines in clay aren't cutting — they're extruding a controlled mudflow while holding face pressure. Penetration per rev is huge, RPM low, and advance is gated by ring-build and muck logistics, not the ground. 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 Advance Rate — Soft Clay (EPB)
- 1Enter your values — Penetration, Cutterhead speed, Utilization (boring share of time), Working hours per day (sensible defaults are pre-filled).
- 2Read the live results: Instantaneous rate, Daily advance, Weekly advance.
- 3Check the "with your numbers" line to see ROP = pen × RPM × 60/1000; AR = ROP × hours × utilization substituted step by step.
- 4Adjust inputs until the scenario matches yours, then copy or share the result.
Why use TBM Advance Rate — Soft Clay (EPB)?
- ✓Instant, free and private — every calculation runs client-side in your browser; nothing is uploaded
- ✓Built on the stated formula ROP = pen × RPM × 60/1000; AR = ROP × hours × utilization with authoritative sources cited on the page (NTNU prediction model — hard-rock TBM performance; Maidl et al., Mechanised Shield Tunnelling, 2nd ed.)
- ✓EPB machines in clay aren't cutting — they're extruding a controlled mudflow while holding face pressure.
- ✓Niche-specific defaults give a meaningful worked answer the moment the page loads
Frequently asked questions
What formula does the tbm advance rate — soft clay (epb) use?+
It evaluates ROP = pen × RPM × 60/1000; AR = ROP × hours × utilization, exactly as published. Sources: NTNU prediction model — hard-rock TBM performance; Maidl et al., Mechanised Shield Tunnelling, 2nd ed.. 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?+
EPB machines in clay aren't cutting — they're extruding a controlled mudflow while holding face pressure. 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?+
Daily and weekly advance for a TBM in soft clay (epb) from penetration, RPM and utilization. A free tbm performance & tunnelling tool. Penetration per rev is huge, RPM low, and advance is gated by ring-build and muck logistics, not the ground. 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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