Monitoring and control of rock pressure in underground engineering Mine earthquake prevention and control technology induced by old coalmine goafs based on surface isolation grouting

The old coalmine goafs generally refer to the remained goafs after room and pillar method or roadway and pillar method mining. The features of the goafs are many irregular pillars remained, uncertain time of surface collapse, etc. The mine earthquake induced by sudden collapse of largescale golfs has become the increasing serious problem in Western China. For example, from the year 2004 to the year 2012, only for the mine earthquake level more than 2.0 grads, there are 76 mine earthquake accidents had happened in Yulin City. The typical cases are seen in Table 1 (Dong et al. 2005, Di et al. 2009).