Abstract
Rock salt is characterized by specific geomechanical and rheological properties. Layers of rock salt at depths of over 900 m cause problems with shaft lining deformation. Methods of shaft lining protection used to date (e.g., in the Sieroszowice mine) have not been effective enough. The research presents a patented and copyright protected concept of a shaft lining construction that can be used in rock masses with strong rheological properties and susceptibility to leaching. A high value of convergence in salt rock mass is a reason for serious problems with shaft lining stability. Numerous trials have been done to provide appropriate shaft lining for salt layers, especially to ensure proper geometry of shaft members and conveyance guidance. In the new shaft lining concept, the excessive rock creep into the outbreak inside the shaft diameter is removed by local and controlled leaching of the shaft cheeks by means of fresh water through a porous medium at the contact layer behind the watertight tubing lining. The article presents the methodology of performing tests on a special device and the test results.
Highlights
The idea of the utilization of a typical salt property, high water solubility, is not new
(a) Confirmation that periodical leaching of salt rock sidewalls supported by coarseronment (internal part of the head is made of EPDM grained aggregate stack is possible, and it allows effective control of the and Santroprene®, and the internal part is made of polypropylene) with a maximum pres‐
The issue of the stability of mine working in the salt rock mass is neither new nor not analyzed
Summary
The idea of the utilization of a typical salt property, high water solubility, is not new. (a) Confirmation that periodical leaching of salt rock sidewalls supported by coarseronment (internal part of the head is made of EPDM (ethylene propylene diene monomer) grained aggregate stack is possible, and it allows effective control (reduction) of the and Santroprene®, and the internal part is made of polypropylene) with a maximum pres‐. The pumping system allows flow (b) Preliminary recognition of the processes related to the salt rock wall leaching and from the top or from the side of the testing chamber. Experiments proved that as a result of the dissolving process on the contact between signed to ensure pressure of 80 kN for maximum operation pressure (180 bar) of the salt and aggregate, a salt bridge is formed (Figure 4), whose shape, depending on the pump. The application of additional electrical subsets was necessary to ensure safety of the operator and the test facility
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