Konrad mine

Excavation of the pit areas for backfill processing (lot 1)

Client

BGE (Bundesgesellschaft für Endlagerung mbH)

Organization

ARGE Konrad backfill processing lot 1 (AKV 1)

Location

Salzgitter, Germany

Execution period

2016

until 2021

As part of the construction of a repository for radioactive waste materials with negligible heat generation in the former Konrad iron ore mine in Salzgitter, mine rooms were built or extended for the infrastructure required for storage operations.

The pit areas to be excavated for backfill processing are located in the 2nd and 3rd levels and were excavated from existing drifts.

AKV_1Rope system_ Mountain bunker — Konrad mine - cable system for the mine bunker

AKV1_Winch system above mountain bunker — Konrad mine - winch system above the mining bunker

AKV1_Waschplatz_20191024 — Konrad mine - underground washing area

AKV_1_BohrletzerAusbauanker — Konrad mine - drilling work on the last support anchor

Project details

Scope of work

Production of pit rooms for backfill processing
New excavations and re-cutting work in existing pits
Excavation of a bunker and construction of a ventilation borehole
Driveway turning point with washing area
Recutting a section of a track on the 2nd level
Construction of a ventilation borehole between the 2nd and 3rd level

Technical data at a glance

approx. 150 m new driveways
approx. 50 m recutting work
Debris accumulation of approx. 15,000 m³ in approx. 2.75 years
10,000 m² Consolidation
11.5 km first safety anchor
5,800 m² outer shell
50 km expansion anchor
Seiger bunker with a depth of approx. 15 m and an excavation diameter of approx. 5.9 m using the raise boring method

Special features

All excavations were built in a way that protects the rock; the excavation was based on the excavation concept of the New Austrian Tunneling Method
Installation of a double-shell, compliant lining system due to the expected rock mass convergences
Installation after a convergence time of at least 12 months to be taken into account

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