Strength in three directions are equal. (Hydrostatic) so for example rock salt into the real stress in the field. Continue to reduce the lateral stress on both sides, and additional stress in axial drilling conditions to simulate the channel settings and record the mine collapse, the three-time continuous axis with a Dial gauge with a resolution of 0.01 mm gaute recording results will make every 1 minute during the first request.Duplicate testing and recording time is extended into every half hour until 12 hours when the compressed air which model will be used at 90% of the In-situ stress into the mine by adding lateral stress on both sides and reduce stress in axial. A simulation of the strength of mast strut that occurred while in the air, and release compressed air storage in the Chong mine.
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