Study On The Asymmetrical Deformation And Control Technology Of The Roadway Through Different Lithology In The Guocun Mine

Subjected to various geological tectonics in the formation process,rock strata are situated in an extremely complex geological environment.Rock strata produce various degrees of tilt in strike and dip directions and even dislocate from each other.Therefore,the excavation of roadways in inclined strata tends to pass through rock strata of different lithology,and deformation and failure of the roadway often presents a non-symmetrical characteristic.It is difficult to ensure the stability of roadways by using the commonly symmetrical support method,which poses a serious threat to the production of coal mines.Based on 12061 floor gas drainage roadway in Guocun Mine as the background,the deformation profile and characteristics of the roadway through rock strata of different lithology is determined by the field research,using FLAC^3D to analyze the factors causing the asymmetric deformation of the roadway,putting forward the supporting principle of dynamic non-symmetrical key parts,and analyzing the characteristics of the stress field,displacement field and plastic zone of three specific roadway sections.And the supporting method of"initial spray+anchor net+reinforcement ladder+anchor cable+grouting"is put forward,and the concrete support parameters are designed according to the specific roadway sections.Based on the simulation analysis of the 12061 floor gas drainage roadway section under the dynamic support,it is concluded that the support performance of the supporting structure is fully performed by the use of dynamic non-symmetrical strengthening support.After the dynamic non-symmetric key parts reinforced support technology has been applied in 12061 floor gas drainage roadway,during the monitoring period 60d,roof subsidence reaches 26mm?150mm under the original supporting condition?,the maximum amount of floor heave is up to 281mm?980mm under the original supporting condition?,the maximum amount of side wall convergence is 211mm?950mm under the original supporting condition?.Compared with the original support condition,the displacement of the roof and floor is reduced by about 73%,and the displacement of the roadway is reduced by about 77.7%,and the deformation of the roadway is effectively controlled.The dynamic non-symmetric key parts reinforced support scheme mainly considers the key weak parts of surrounding rock of roadway,targeted to improve the weak link of the supporting strength,and thus effectively control the overall stability of the roadway.