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Stability Study In The End Zone Of Mining Face Of Full-mechanized Caving

Posted on:2017-03-27Degree:MasterType:Thesis
Country:ChinaCandidate:X J GaoFull Text:PDF
GTID:2271330482490895Subject:Building and civil engineering fields
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The mining industry has developed rapidly in recent years, full-mechanized has become the main caving mining method in our country. However, as the working face going forward constantly, it is easy to a variety of adverse situation such as the roof collapse, stents instability and so on. So Study the stability of surrounding rock, such as working face, end zone, gob-side entry driving and so on, has important theoretical and practical significance.The paper is based on S2107 working face of Yu WU coal mine as practical engineering background, I study the stability of surrounding rock structure respectively from surrounding rock structure of the end zone, surrounding rock structure of roof, surrounding rock structure of roadway, by these methods of collecting data on the spot, theoretical analysis, numerical simulation, I do further research On the stability of the end zone of working face.First of all, the arc triangle which is formed after the roof collapsing is regarded as big structure of the end zone and end bracket is regarded as small structure of the end zone. Establishing mechanical model of end roof, using the theory of elastic and thin plate’s small deflection and galerkin method deduce deflection function of roof and stress distribution rule of roof. According to guarantee the stability of large and small structure preliminary design the end bracket which is suited to the characteristics of Yu Wu mine.Secondly, combining with Lade-Duncan rule in theory, under the condition of considering the principal stress, using the stress equilibrium equation in the interface of coal seam and knowledge of elastic-plastic mechanics determine the plastic zone width of coal pillar as well as width of the core zone. Besides, through the numerical simulation, I analyze the maximum principal stress value in coal pillar and the distribution of stress in coal pillar in the case of different coal pillar width. Finally combining with theoretical calculation value and the numerical simulation analysis, I select the reasonable width of coal pillar.Finally, considering the existing and practical way of coal pillar reinforcement, the actual construction conditions in the spot, I Adopted the anchor bolt reinforcement, anchor+grouting reinforcement. And then through the numerical simulation, I analyze deformation characteristics of coal pillar in two reinforcement mode. Finally through the comparison and analysis, I select the optimal way of reinforcement.
Keywords/Search Tags:fully mechanized caving face, end zone, numerical simulation, width of coal pillar, method of reinforcement
PDF Full Text Request
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