Optimization of cross-section shape of gently inclined semi-coal rock roadway with high geostress
In order to optimize the cross-section shape of gently inclined semi-coal roadway with high geostress,the study was carried out with the roadway of 3018 working face in Donghuantuo Mine as the engineering background.The analytic stress solutions of different cross-section shapes in inclined coal seam are derived with the theory of complex variable function,and then the stress concentration and plastic zone of tunnels with different cross-section shapes are solved using FLAC3D numerical simulation,and the optimal cross-section shape of tunnels is determined on this basis.Finally,the reliability of the research results is verified by field industrial tests.The results show that the failure of gently inclined semi-coal roadway is asymmetric under the action of high ground stress;Regardless of the cross-section shape,the roadway presents high stress concentration at the left and right bottom corners,and the stress concentration degree is rectangular>trapezoidal>straight wall arch;The stability of straight-wall arched roadway is the best,followed by trapezoidal roadway,and the rectangular stability is the worst.It is determined that straight-wall arched roadway is the final roadway section shape.The monitoring results of roadway surface displacement show that the straight-wall arched roadway can better meet the requirements of on-site safety production.
high ground stressgently inclined semi-coal rock roadwayroadway section shapefunction of a complex variable
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