Research on Type Selection of Mechanized Hydraulic Support for Inclined Coal Seam in Large Mining Height Working Face
In view of the problems of strong mine pressure,high mining intensity,easy roof caving,and difficulty in support existing in large mining height and large dip angle fully mechanized mining face,taking the 1311 working face of Wangcun Coal Industry as the research background,the failure law of the overlying rock of the working face is studied,the loads of the key layer and other layers are calculated,the ultimate span of the key layer and the basic roof periodical weighting layout are determined,and a FLAC3D numerical simulation model is established to study the influence law of working face advancement on the vertical stress distribution and vertical displacement distribution;Calculate the working resistance of the hydraulic support,conduct hydraulic supports type selection and analyze their stability.The results show that the distribution range of initial support force and final resistance of the hydraulic support is between 4000-6000 kN and 5000-7000 kN,greater than 60%of the rated working resistance,accounting for 42.5%and 70.6%respectively,greater than 80%of the rated working resistance,and accounting for 0%and 82.5%respectively.There is no situation of exceeding the rated working resistance.The selection of hydraulic supports in the 1311 working face meets the requirements of downhole support and can well adapt to the complex working conditions of downhole large mining height and large dip angle.
large mining heightfully mechanized mining faceinclined coal seamhydrualic support type selection
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