Journal of University of Science and Technology Beijing
Volume 14, Number 1, February 2007, Page 1
Corresponding author: Chengxiang Yang, E-mail: tlycq@yahoo.com.cn
Application of microseismic monitoring system in deep mining
Chengxiang Yang, Zhouquan Luo, Guobin Hu, and Xiaoming Liu
School of Resources and Safety Engineering, Central South University, Changsha 410083, China
(Received 2006-05-26)
Abstract: The microseismic monitoring system was used in the Donggua Shan underground copper mine, and its application was in-
troduced. The spacial distribution of the seismic event was monitored effectively during mining with this system. The distribution of
the seismic intensity in different time periods and in the different mining districts was obtained via the clustering analysis of the mo-
nitored results, and the different intensity concentration districts of seismicity were compartmentalized. And also the various charac-
teristics and waveforms of different vibrations in the underground mine were revealed with the help of the micro-seismic monitoring
system. It was proved that the construction and application of the micro-seismic monitoring system in the mine not only realized the
continuous monitoring of seismicity in the deep mine, but also settled an important foundation for further studies on hazard prediction,
based on this system.
Key words: microseismicity; monitoring; event; deep mining
[This work was financially supported by National Key Technologies R & D Program of China (No.2004BA615A-04).]
1. Introduction
At present, the Donggua Shan Copper Mine is a
large-scale deep underground mine with a mining
depth of 1000 m, in China, which has the tendency of
rock burst and belongs to the typical deep mining cat-
egory [1]. To ensure the safe production, the mine used
the microseismic monitoring system produced by
Integral Seismic System International Ltd., South
Africa, to realize the dynamic monitoring of the
seismicity [2-6], to master the changed rule of
stress and deformation of rock mass in time, to
predict the rock burst, and to understand the dan-
gerous area and its hazard level, to serve for op-
timizing the mining order and the stope structure
parameters, and also assist people to put forward
effective measures for controlling the rock burst
and the deformation of the rock mass.
2. Microseismic monitoring system
2.1. System structure
The structure of the microseismic monitoring sys-
tem used in Donggua Shan Copper Mine is shown in
Fig. 1. The system consists of sixteen sensors, four
quake seismometers (QS), one QS-Repeater, one un-
derground controller, one surface monitoring control
center, and a communication cable connected with the
center. Each QS connects four sensors, three of them
are one dimensional and the fourth one is three di-
mensional.
Fig. 1. Schematic illustration of the monitoring system
structure.
2.2. Communication system
The communication system is shown in Fig. 2. The
communication between the QS and controller adopts
the RS485 standard. QS is connected to the controller
using a single-pair cable, and also the QS is connected
to other QSs using a single-pair cable. The highest
communication speed is 115200 baud. The maximal
distance between two devices is 1200 m. A repeater is
used to transmit signals when the distance is longer
than 1200 m. Therefore, all the QSs are connected with