最大主应力方向对围岩偏应力及变形影响研究

地应力是引起巷道变形破坏的主要因素之一，为了分析最大主应力方向对围岩稳定的影响，采用FLAC3D模拟了夹角α从0°～90°过程中围岩塑性区分布、偏应力及位移变化规律。研究结果认为：α越大，“围岩”塑性区范围越大，且有向顶、底板围岩深部发展的趋势|围岩偏应力呈“单峰”状，顶、底板围岩偏应力峰值随α增大而增大，而帮部偏应力峰值则减小|围岩位移变化呈类“线性”增长，围岩变形随α增大而增大，最大水平主应力方向对顶、底板围岩变形的影响大于帮部。通过现场观测，验证了分析结果的可靠性。

Influence of Direction of Maximum Principal Stress on Stability of Roadway

In order to analyze direction of maximum principal stress on stability of surrounding rock, plastic zone, deviatoric stress and displacement during angle from 0°~90° are simulated by Flac3D. It is concluded that plastic zone area of “surrounding rock” is larger with the increase of α, and develop to depth of roof and floor. Deviatoric stress is a “single peak”, and peak of deviatoric stress of roof and floor increase with increase of α, but sides are opposite. Displacement also increases “linearly”, and direction of maximum horizontal stress on deformation of roof and floor surrounding rock are greater than that of the sides. The reliability of analysis results is verified by field observation.