Abstract
With the increasing depth of coal mining and expanding mining scale, the rocks surrounding deep roadways are in a complex mechanical condition of frequent dynamic disturbance. The heterogeneity has an important influence on rock mass failure under dynamic loads. Therefore, it is necessary to study the deformation and failure of heterogeneous roadway under dynamic load. In this paper, the effect of heterogeneity on stability of roadway under static and different dynamic loads is studied. According to the results, the effect of rock mass heterogeneity on the deformation and failure of surrounding rock varies with different degrees of heterogeneity. Under static loading conditions, the stability of roadway is negatively correlated with the degree of heterogeneity of the rock mass. Under dynamic loading conditions, the change of heterogeneity degree has significant influence on the stability of surrounding rock. With the increase in dynamic load strength, the change in variation difference in the average value of roof sag, stress distribution, and plastic zone caused by variations in heterogeneity will increase. This study contributes to understanding the deformation and failure characteristics of heterogeneous roadways under dynamic loads and can be used to analyze heterogeneous roadways under dynamic loads.
Highlights
In underground coal mining, due to increasing depletion of shallow resources, mines have entered the state of deep resource mining domestically and internationally
Based on complex deep mining conditions, the lithology of coal seam strata is relatively weakly affected by sedimentation, and the rock mass is weakened as a result of fracture development, which leads
When peak particle velocity (PPV) 0 m/s, PPV 1.5 m/s, and PPV 2.5 m/s, the maximum variation differences in the amount of failure elements caused by variation in heterogeneity are 27, 76, and 81, respectively. e number of failure elements in the rock mass increases with increasing dynamic load strength
Summary
Due to increasing depletion of shallow resources, mines have entered the state of deep resource mining domestically and internationally. Based on the above situation, research studies on the mechanism and control of underground roadway instability under dynamic loads have received extensive attention from domestic and foreign scholars [3,4,5,6,7,8,9] He et al [10] discussed the distribution characteristics of static and dynamic loads near the working face and proposed the stress condition and energy variation law. Erefore, to clearly investigate the characteristics of heterogeneous roadways under dynamic loads, this study can use the numerical simulation research method, which considers rock mass heterogeneity and complex stress conditions. Based on Zhaogu No 2. mine, the effect of heterogeneity on rock mass stability under dynamic loads is analyzed. e research results can provide a method technology and provide some help for selecting suitable support scheme for further study of other highly heterogeneous rock engineering projects that are frequently disturbed by dynamic loads
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