DongHailong, GaoQuanchen. Evaluation and improvement on analysis of plastic zone in roadway surrounding rock under unequal compression in two directions[J]. Journal of Mining Science and Technology, 2019, 4(3): 213-220.
Citation: DongHailong, GaoQuanchen. Evaluation and improvement on analysis of plastic zone in roadway surrounding rock under unequal compression in two directions[J]. Journal of Mining Science and Technology, 2019, 4(3): 213-220.

Evaluation and improvement on analysis of plastic zone in roadway surrounding rock under unequal compression in two directions

  • Basedonthespeciallateralpressurecoefficientsof1,theradiusofsurroundingrockplastic zoneobtainedbyapproximateimplicitmethodhasalargetheoreticalerrorcontrastedwiththecorre⁃ spondinganalyticalsolution of the mature axisymmetric plane strain theory*In order to improve this shortcoming,fromtheexistingestimationmethodforsurroundingrockplasticzoneradiusonhorizontal axisandbasedontheformulasofplasticzoneunderaxisymmetricstressfieldandassumptionofthe constanttotalcollectiondegreeoflineloads,theapproximateanalyticalsolutionofthesurroundingrock plasticzoneofunequalstressfieldonvertical(orhorizontal) axiswasderived*Thencombiningwith shapeofplasticzonedeterminedbyapproximateimplicitmethod,theplasticzoneofsurroundingrock underunequalcompressionintwodirectionswasrelativelyaccuratelydetermined*Theproposedmethod notonlyeliminatesthetheoreticalerroroftheapproximateimplicitmethodforthelateralpressurecoef⁃ ficientof1,but also overcomes the theoretical defects of radial stress equal to zero in elastoplastic boundaryofsurroundingrockbyusingoriginalestimationmethodwithaxisymmetricstress*Soproposed methodcouldbeconsideredasarelativelyreasonableandaccurateestimationmethodfortheplastic
    zoneinroadwaysurroundingrockunderunequalcompressionintwodirections*
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