Application Of Rockburst Risk Assessment And Monitoring Technology In Huating Coal Mine

Huating Coal Mine,as an important part of Huating Coalfield,has complex geolo gical conditions and many times of rock burst phenomena in the mining process.Altho ugh a series of measures have been taken to monitor and prevent rock burst and some achievements have been achieved,due to the complexity of the structure of the mine field,rock burst frequently occurs,so the risk assessment of rock burst in Huating C oal Mine is made.The monitoring technology still needs to be further studied.Based on the research background of rock burst in Huating Coal Mine,the mecha nism of rock burst disaster in Huating Coal Mine is analyzed and studied by means o f field investigation,theoretical analysis of dynamic and static load,fuzzy comprehensi ve evaluation and multiple monitoring information.The risk of rock burst is evaluated and the monitoring system of rock burst is established.The main research results are a s follows:(1)The geological conditions of Huating Coal Mine show that folds are dominant and faults are secondary structural features.Complex fold structures provide favorable conditions for the development of the situation.The measured results of in-situ stress in Huating Coal Mine show that the direction of maximum horizontal principal stress is mainly between N14.2 E and N51 E,which is consistent with the direction of tect onic stress in the area.(2)The theoretical analysis shows that when the coal-rock system is disturbed by dynamic load,it will cause the coal-rock system around the mining space to exceed th e ultimate strength and cause rock burst damage,which will induce rock burst.The ro ck burst in Huating Coal Mine is related to the dynamic disturbance caused by mining activities.In view of the conditions of rock burst disaster caused by dynamic and static overlapping loads,the theoretical basis for preventing and controlling rock burst is put forward.(3)Analytic hierarchy process(AHP)is used to calculate the weight of rock burst manifestation caused by various influencing factors.The regional evaluation model of rock burst hazard in Huating Coal Mine is established.Based on GIS technology,the regional distribution map of rock burst hazard in Huating Coal Mine is obtained by us ing fuzzy comprehensive evaluation method.(4)By using drilling cuttings method,microseismic monitoring,stress-strain monito ring system and ground sound monitoring technology,a multi-information monitoring m ethod of rock burst in Huating Coal Mine is constructed.Based on the analysis of cou pling characteristics of multiple precursory information of "microseismic-geoacoustic-stre ss-drilling cuttings" appearing in Huamei Coal Mine,an anomalous precursory informat ion coupling model of dangerous rise of strong rock pressure is put forward.Through the research of this paper,we can understand the mechanism of rock bur st hazard more clearly,grasp the evaluation method and monitoring technology of rock burst hazard,and adopt the pertinent prevention and control technology of rock burst.It provides an effective way for risk assessment and monitoring of rock burst..