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Abstract In order to study the effect of blasting on the stability of surrounding rockmass in underground metallic mine，fiber grating sensing system is used to monitor the strain of the surrounding rockmass on the effect of the blasting on a typical cross-section VII–2 in Xiadian Gold Mine. Combined with the practical exploration approaching，the stability of surrounding rock is computed using the earthquake wave achieved from the site. According to the result of the numerical simulation，the layout of the sensors is optimized. The presented work shows the fiber grating sensing system is able to monitor the micro-strain of the surrounding rockmass caused by blasting. It is feasible that using the fiber grating sensing system to monitor the stability of surrounding rock in underground metallic mine can be adopted. The effect of blasting to the exploded tunnel is larger than nearby tunnels. The stress and the coefficient of the nearby surrounding rock are changed and attenuated by the distance. When disposing the monitoring point of sensors，the regular point is combined with the key point，and periodical monitor is combined with the long-term monitoring. According to the change regularity of the displacement，stress，acceleration and velocity of tunnels before and after exploded，the layout of the key monitoring point is optimized which will improve the aim of monitor.
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Received: 28 April 2007
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