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The speed of backfilling can reach 10 m per day.
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It was merely a way of backfilling evidence behind a decision already taken, some observers believed.
This could be caused by confinement effect of backfilling and the infiltration of backfilling slurry content into the failure zone improves mechanical properties of the broken pillars.
Increasing Portland cement also improves the properties due to the high confinement of backfilling.
Open image in new window Fig. 17 Stress strain curve of backfilled pillar models under different backfilling heights.
Open image in new window Fig. 19 Stress strain curve of backfilled fractured pillar models under different backfilling heights Open image in new window Fig. 20 Stress strain curve of backfilled fractured pillar models under different backfill mixtures contents.
Open image in new window Fig. 18 Stress strain curve of backfilled pillar models under different backfill mixtures contents.
Table 2 Mechanical properties of backfilling materials used in numerical analysis Materials Young's modulus (MPa) Poisson's ratio Uniaxial compressive strength (MPa) m s Unit weight (MN/m3) Backfill 1 20.020.3 20 10.0 0.1 0.020 Backfill 2 500 0.3 10 7.5 0.1 0.017.
However, at greater depths, the effectiveness of backfilling cannot be obtained well.
But I'm kind of backfilling here.
Speed to market, speed of execution.
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