不同侧压下底板切槽对围岩稳定性影响模拟研究
Simulation Study of the Influence of Floor Grooving on Surrounding Rock Stability Under Different Lateral Pressure
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摘要: 底板切槽是一种通过改变围岩应力状态抑制底鼓的主动防治措施。采用数值模拟研究不同侧压系数条件下底板切槽对围岩变形及应力演化规律的影响,研究结果表明:底板切槽会引起帮、顶位移的增加,从控制围岩变形的角度,底板切槽更适合于侧压系数较大的巷道;底板切槽对顶板围岩应力分布没有明显影响,随切槽深度的增加,帮、底围岩应力峰值向深部转移同时峰值降低,帮部以应力峰值降低为主,底板以应力峰值向深部转移为主;侧压系数越大,帮、顶应力峰值向深部转移的距离越小。Abstract: Floor grooving is an active measure to control floor heave by changing the stress state of surrounding rock.The influence of floor grooving on surrounding rock deformation and stress evolution law under different lateral pressure coefficients were researched by numerical simulation.The results show that floor grooving can lead to increase of sides and floor displacement,it is more suitable for roadway with large lateral pressure coefficient from the control point of rock deformation;the influence of floor grooving on roof rock stress distribution isn′t obvious;with the increase of grooving depth,the stress peak of sides and floor shifts to deep parts and the peak decreases at the same time;sides take the stress peak decreasing as the principal and the main change of floor is that the stress peak shifts to deep parts;the larger of lateral pressure coefficient,the smaller of distance of sides and roof peak shifting to deep parts.
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