School of Civil, Environmental and Mining Engineering

Postgraduate research

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Current and completed research by our postgraduate students.

Contact

Xiawei (Hawaii) Yi

Phone: (+61 4) 1531 8603


Start date

Jul 2012

Submission date

Xiawei (Hawaii) Yi

Xiawei (Hawaii) Yi profile photo

Thesis

Mechanics of Reinforced Cemented Paste Backfill in Deep Metalliferous Mine

Summary

The main objective of this research is to explore the effects of reinforced cemented paste backfill (e.g., fibre-reinforced cement) for reducing rock squeezing and rockburst hazard in deep metalliferous mine. Specifically, four laboratory tests are included:

•Geotechnical laboratory tests on fibre-reinforced and non-reinforced cemented paste backfill, including uniaxial compression tests, triaxial compression tests and Split-Hopkinson pressure bar tests.

•Smart aggregates for evaluating the damage status at different points of samples from early curing age up to final failure stage. The additive smart aggregates help establish an active-sensing system to perform the inner-deformation monitoring of samples.

•The digital image processing method (e.g., CT-scan and Nuclear Magnetic Resonance) for observing the micro-damage of both fibre-reinforced and non-reinforced cemented samples under triaxial tests.

•Testing the damage status of fibre-reinforced and non-reinforced cemented samples under simulated rockburst environment in laboratory.

Why my research is important

According to the deep mine conditions of high crustal stress, high temperature and high seepage stress, the paste backfill could be the best method for mining. In present studies, the energy release rate (ERR), the excessive shear stress (ESS) and the average pillar stress (APS) are used to evaluate rockburst as determined parameters. As a developed theory, the failure of rock mass has intimately relationship with ERR. It is the main point that minimizing the ERR can effectively reduce the rockburst damage. The paste backfill are extensively used for supporting mine stopes, and more importantly, it is able to absorb a part of energy from wall rock and decrease the ERR due to its larger deformation than rock mass. Thus, improving the energy-absorption capacity of paste backfill is a basic step for rockburst controlling. Many previous material tests indicated that fibre-reinforced cement has increased the shear strength and ductility of the concrete. That could be an arousing result if the fibre-reinforced cemented paste backfill had the marked capability for reducing the ERR with its higher shear strength and ductility.


 

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Last updated:
Thursday, 19 September, 2013 11:39 AM

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