Prevention and Control of Rockbursts in Dongguashan Copper Mine

Rock Engineering 2009 - Rock Engineering in Difficult Conditions
Lizhong Tang,
Abstract Dongguashan Copper Mine is the first rockburst-
prone deep metal mine in China and has been in
operation since 2005. To prevent and control
rockbursts during production, systematic studies
are carried out using an innovative research
method that combines laboratory experiments,
numerical calculations and onsite monitoring. 1.
Rockbursts prediction is carried out at the stage
of mine design. The concept of residual energy
index is adopted. The rockburst proneness of the
rock mass in the mine is determined by this
index. Rockburst proneness of rock under the
condition of mining is predicted by numerical
simulations and onsite rockburst investigations.
The characteristics of spatial distribution of
the proneness of rockbursts under the conditions
of Dongguashan Mine are predicted comprehensively
this way.
2. The stope structural parameters and mining
sequence of the deposit are optimized with
numerical simulations based on energy release.
Based on these studies, the principles and
measures of rockburst control during mining are
discussed.
3. The monitoring of rockbursts in the mine is
carried out. A micro-seismic monitoring system is
deployed in the mine to monitor rockbursts and
underground pressure activities. The
characteristics of space-time-intensity of
mining-induced seismicity and the seismic
response to mining are studied with the
seismicity data in Dongguashan Mine. Relations
between seismicity and the size of excavation are
determined. The changing rate of ratio between
the stiffness of rocks in seismic nucleation
areas to its surroundings is used as a criterion
for rockburst prediction.

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