Characteristics Of F₂ Fault Group And Optimization Of Roadway Layout In Renlou Colliery

In the process of coal resources exploitation,both engineering geological and hydrogeological conditions are the key factors that must be paid attention to before construction.Faults,as the main form of geological structure,have an important impact on the layout of coal mining area,coal pillar setting,water control projects and so on.The mining area selected in this research is Renlou colliery,whose geological form is relatively complex.F₂fault is characterized by tension and torsion.The rocks in the fault zone are fragmented,disordered and cracks are developed.The rock morphology in these series of tension and torsion faults directly affects the resource exploitation and water control work in coal mining area.Based on the reference of previous research data and the analysis of geological and hydrological conditions in Renlou colliery,the ultimate goal is to study the influence factors and improvement measures of F₂fault group on Hydrogeology and engineering geology in the mining area.On the basis of relevant research data and in order to restore the geological form of the mining area to the greatest extent,this subject has prepared relevant exploration equipment and corresponding models to simulate the geological form of the mining area.The purpose of this paper is to combine the previous research data with the field survey and simulation test of this paper,and to obtain the mechanism and magnitude of the influence of F₂fault on the geological and hydrological conditions of the mining area.Suggestions and suggestions on improving mining efficiency on the basis of safe production are put forward.At the same time,this study also carried out surface drilling,pumping and water injection tests for F₂fault group,and carried out composition identification,mechanical and geostress detection tests for rock samples in F₂fault zone and roadway pre-exposed points.From the analysis of pumping flow measurement curve and natural flow curve,it can be seen that F₂fault group is almost completely water-insulated in the water-insulating zone,and has no water cut.Nor can the water conduction between faults be realized.According to the theory of rock sample formation period,mechanical properties of faults and the composition of fillings in faults proposed by previous scholars,we can see that although this study puts forward that the aquifer is not water-bearing,it can not completely deny that there may be water conduction in local fault structures.By X-ray diffraction analysis of the rock sample appearance and material composition in the fault zone,it is concluded that the rock samples in this group mainly contain more quartz,kaolinite,mica and some pyrite minerals as a whole.In addition,the acoustic emission method(AE method)is used to measure in-situ stress.The distribution characteristics of in-situ stress are mainly horizontal tectonic stress,and there are high abnormal areas of in-situ stress.From the above analysis,it can be seen that the sequence of formation of F₂fault in this mining area is tension first and then compression-shear,which is a kind of tension fault.From this point of view,it can be concluded that the fault may have water conductivity,but from the mechanical test,it can be seen that the development trend of fault is non-conductivity.Finally,through the analysis of hydrogeology and mechanical properties of F₂fault group,this paper gives three suggestions on the location of the main roadway crossing F₂fault group in Zhongliu Tunnel.By comparing the differences of the three designs in various aspects,a reasonable and feasible work plan is put forward for the safe production and efficient operation of this mining area.