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Abstract In order to study the three-dimensional dynamic effect of roadway surrounding rock caused by gas outburst in fault zone，the propagation characteristics and the failure law of surrounding rock were simulated by LS-DYNA and LS-PrePost based on wave theory such as peak overpressure and speed equation，as well as the 10.20 outburst accident of Daping coal mine.The results show. (1) The particle damage is most serious at the junction of shock wave funnel boundary and roadway roof，and the peak speed can be 78.015 cm/s. Along tunnel axial，there is blind area of blast wave in front of maximal value area(2.1 m)，and decay area behind it. The distance of decay area is 280min this case. (2) The erosion of sidewall caused by shock wave is not serious. In the range with 120 m from extraction face，the velocity and peak displacement of nodes on roof are 2–4 times bigger than that of the sidewall within 120 m to the extraction face，while they gradually tend to be the same when the distance is more than 120m. (3) When the lithology is poor，the amplitude of particle under impact effect is much bigger，and when the elastic modulus of rock mass decreases to 0.05 GPa，the amplitude can increase to 64.776 mm. The damage of roadway becomes more serious and easy to induce earthquake.
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2015, Vol. 34 
