The impact trend of rock-coal system was studied by the method of accumulat- ing and releasing of deformation energy and interaction of rock-coal system.The system model of roof-coal-floor was established.Based on the RFPA software,rock fracture process analysis system,the numerical test of deformation,fracture and energy transmis- sion of nonlinear and nonhomogeneous rock-coal system,and the numerical test and evaluating method of impact trend of rock-coal system were achieved.When the same coal seam was in different roof and floor conditions,the fracture process of rock-coal sys- tem can be classified as gradual,sudden and delayed fracture three kinds,and their im- pact trend can be classified as void,intense and medium correspondingly.The rock-coal system's impact trend is evaluated by the system impact index μ and burst expanding forms.The criteria μ are μ<1.0,1.0≤μ<1.5 and μ≥1.5 when the impact trend is void,in- tense or medium,which are tested and verified by the No.2 and No.4 coal seams in Sun- cun mine.
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