Tunnel Logistics — Tunnel Inflow & Pumping
Tunnel Inflow & Pumping for TBM drive planning.
Downhill drives collect their own groundwater at the face — pumping is life support, and the standby margin is non-negotiable: a flooded TBM is a months-long insurance story. Inflow predictions from sparse boreholes routinely miss 3×; the probe-drill rig ahead of the face is the real forecast.
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.
Tunnel Inflow & Pumping for TBM drive planning. A free tbm performance & tunnelling tool — no sign-up, no upload, instant results in your browser.
About Tunnel Logistics — Tunnel Inflow & Pumping
Tunnel Logistics — Tunnel Inflow & Pumping computes the governing relationship duty = inflow×3.6; installed = duty×(1+standby) live as you type. Downhill drives collect their own groundwater at the face — pumping is life support, and the standby margin is non-negotiable: a flooded TBM is a months-long insurance story. Inflow predictions from sparse boreholes routinely miss 3×; the probe-drill rig ahead of the face is the real forecast. 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 Tunnel Logistics — Tunnel Inflow & Pumping
- 1Enter your values — Steady inflow, Tunnel grade (down = drainage to face), Standby pump margin (sensible defaults are pre-filled).
- 2Read the live results: Pumping duty, Installed capacity.
- 3Check the "with your numbers" line to see duty = inflow×3.6; installed = duty×(1+standby) substituted step by step.
- 4Adjust inputs until the scenario matches yours, then copy or share the result.
Why use Tunnel Logistics — Tunnel Inflow & Pumping?
- ✓Instant, free and private — every calculation runs client-side in your browser; nothing is uploaded
- ✓Built on the stated formula duty = inflow×3.6; installed = duty×(1+standby) with authoritative sources cited on the page (Maidl et al., Mechanised Shield Tunnelling, 2nd ed.; ITA/BTS — Mechanised tunnelling guidelines)
- ✓Downhill drives collect their own groundwater at the face — pumping is life support, and the standby margin is non-negotiable: a flooded TBM is a months-long insurance story.
- ✓Niche-specific defaults give a meaningful worked answer the moment the page loads
Frequently asked questions
What formula does the tunnel logistics — tunnel inflow & pumping use?+
It evaluates duty = inflow×3.6; installed = duty×(1+standby), exactly as published. Sources: Maidl et al., Mechanised Shield Tunnelling, 2nd ed.; ITA/BTS — Mechanised tunnelling guidelines. 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?+
Downhill drives collect their own groundwater at the face — pumping is life support, and the standby margin is non-negotiable: a flooded TBM is a months-long insurance story. 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?+
Tunnel Inflow & Pumping for TBM drive planning. A free tbm performance & tunnelling tool. Inflow predictions from sparse boreholes routinely miss 3×; the probe-drill rig ahead of the face is the real forecast. 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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