The geological hazard and environmental problems induced by coalmine goafs have become one of important factors that impacting the safety and sustainable development of regions and enterprises in China. In order to prevent and reduce the mine earthquake induced by suddenly collapse of large scale coalmine goafs, the surface isolation grouting technology is put forward innovatively. Based on the introduction of the theory and feature of isolation grouting prevention and control technology, the thesis analyzed the smallest instability area of old coalmine goafs through statistical analyses and numerical simulation analyses, the 20,000 square meters goaf was selected as one isolation grouting unit. In addition, it gave concrete exposition in the aspects such as the drilling layout parameters, grouting material ratio, engineering quantity of isolation grouting, drilling and grouting construction process, case analyses, etc. The results show that the isolation grouting prevention and control selected as one isolation grouting unit with 20,000 square meters is with lower cost, and can effectively avoid or decrease the mine earthquake caused by suddenly collapse of large scale goafs, control or inhibit the goafs spontaneous combustion or ignition in some degree. So it is a kind of reference and promotion method in the prevention and control of coalmine goafs hazard.


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).

In the terms of old coalmine goafs prevention and control, many experts and scholars conducted a series of researches (Li & Yao 2004, Wang et al. 2007, Li et al. 2002), combining the many years' experience of Chinese Coal Research Institute (CCRI) (Zhang 2008, CCRI 2010, 2011, Wen 2011, 2013, Li et al. 2011, Liu et al. 2012), generally speaking, as for the old goafs with no buildings and structures on surface, the open stripe and reclamation control scheme is prior consideration adopted when old goafs were shallowly buried (less than 100 m).

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