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《Chinese Journal of Underground Space and Engineering》 2006-06
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Effect of Confining Pressure on Distributions of Horizontal and Vertical Stresses around Rectangular Roadway and Broken Rock Zone

WANG Xue-bin,PAN Yi-shan,LI Ying-jie(Department of Mechanics and Engineering Sciences,Liaoning Technical University,Fuxin 123000,China)  
Using FLAC,a column of thirty six elements closer to the vertically symmetric axis of plane strain model and below the floor of the roadway is monitored to obtain the distributions of horizontal stress(similar to the hoop stress around a circular roadway) and the vertical stress(similar to the radial stress) at different confining pressures.In elastic stage,the adopted constitutive relation of rock was linear elastic;in strain-softening stage,a composite Mohr-Coulomb criterion with tension cut-off and a post-peak linear constitutive relation were adopted.The horizontal stress is continuous and its peak falls into elastic zone since the yielded element undergoes strain-softening behavior in the process of iteration to achieve the equilibrium.The horizontal and vertical stresses are concave upward in plastic zone.When the horizontal stress reaches its peak,the horizontal stress is concave upward,while the vertical stress is convex upward.The vertical stress is higher at the place far from the roadway.The peak of horizontal stress linearly increases with confining pressure.At higher confining pressures,the difference between the peak of vertical stress and the confining pressure is apparent owing to higher tangential stress.At lower confining pressures,the external surface of broken rock zone(BRZ) around the rectangular roadway is like a circular and the strainsoftening zone(SSZ) is like a cirque.At higher confining pressures,the external surface of BRZ is like a rectangle and SSZ is like a thin-walled rectangle.With increase of confining pressure,the thickness of BRZ increases.Confining pressure does not influence the thickness of SSZ.
【Fund】: 国家自然科学基金重大项目(50490275);; 国家自然科学青年基金项目(50309004)
【CateGory Index】: TD322
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