Taking the working face of I010203 in the gently inclined coal seam of Kuangou as the research back-ground,combining theoretical analysis,numerical simulation and other means to carry out relevant research on the change rule of displacement field and stress field of the working face over the fault.And based on the site monitoring data,the following conclusions were drawn:(1)According to the theoretical calculation of the over-running support pressure and on-site measurement,the back-mining face over the fault is divided into three min-ing areas:normal mining areas,areas affected by overshooting and areas affected by faults,respectively.Micro-seismic energy changes from"low frequency,high energy"to"low frequency,low energy"to"high frequency,high energy"during the advancement of the working face;(2)Due to the influence of the tilt angle of the working face of I010203,the microseismic energy events in the lower trench of the working face are more than those in the upper trench,and at the same time,according to the analyses of the microseismic energy events in the mining face.Under the action of mining disturbance,the working face is very prone to 2 types of impact accidents,respectively,fault activation type impact and fault coal pillar type impact;(3)When the mining face is far away from the fault,the tectonic stress is released under the effect of mining disturbance,and the total microseismic energy is relative-ly active.Stress manifests itself in the stress manifestation stage,and as the working face gradually advances to the fault,the total microseismic energy changes from a stable order to an active stage,while the fault activation manifests itself from an energy storage stage to a fault activation stage;(4)Numerical simulation is established for the back-mining face of I010203 in Kuangou,and the analysis shows that the fault contact surface of the workface changes from the initial activation stage to the activation and stabilisation stage in the process of the workface gradually advancing towards the fault.Eventually close to the fault when the activation of the intensification phase,the numerical simulation established and the working face back to mining during the microseismic large energy event change rule is basically consistent.
microseismic energyfaultingactivation instabilityfaulted coal pillar type shockfault activated shockmining disturbance
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