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Tag Archive: mine

  1. Simple Karst Remediation with Polyurethane Grout

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    Karstic formations can impose many challenges for mining and infrastructure. These underground passages often channel water into unwanted areas.  In this instance, a sinkhole opened in a stream bed, traveled through karst, and was emptying into a quarry.  To stop the water from traveling down the sink hole and to return the water to its normal flow, the polyurethane grout Hyperflex was used.

    Hyperflex is a single component hydrophobic polyurethane that reacts with water to produce a flexible foam.  Hyperflex was simply poured down the holes and was carried throughout the voids by the water. The raw Hyperflex reacted (foamed) with the presence of water. The foam then sealed off the leak paths.  Hyperflex is NSF/ANSI/CAN 61 approved for contact with potable water. Hyperflex is produced by SealGuard, Inc.

    karst repair

     

  2. Tunnel Passing Through Fault Zone helped with Polyurethane Injection

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    The polyurethane grout, SealGuard II, was needed to mine forward in this tunnel.  The tunnel was in a fault zone, and all the voids were to be filled with concrete.  However, when injected, the concrete leaked out of the face.  To contain the concrete, polyurethane grout was injected to provide a buffer. SealGuard II reacts is about 3 seconds and produces a rigid foam (900 PSI compression strength).  With the concrete contained in its intended location, advancing was able to commence. SealGuard II is manufactured by SealGuard, Inc. and the grouting was performed by Sub-Technical, Inc.

     

     

     

  3. Water Leaking through Old Mine Core Hole Stopped with Polyurethane

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    This underground mine, which is 1,100 feet below the surface, mined into a core hole taken from the surface.  The core hole was dumping significant amounts of ground water into the mine.  To stop the water inflow, a high-pressure probe and polyurethane grout was implemented. Grouting contractor Sub-Technical, Inc. used their specially designed probe to insert into the core hole.  The probe contains a port where polyurethane can then be injected to permanently seal it off. The polyurethane used was SealGuard II, which is manufactured by SealGuard, Inc.  SealGuard II is a dual component polyurethane grout that reacts in about 3 seconds to produce a rigid foam.  The cured foam has a 900-psi compression strength.