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采用库伦摩擦接触模型模拟钢衬与外包钢筋混凝土间摩擦接触特征,建立了李家峡水电站坝下游面钢衬钢筋混凝土管道结构模型,系统研究了内水压力作用下外包混凝土起裂荷载、裂缝扩展、管道变形、钢衬与钢筋应力分布特征等承载性能规律。结果表明:考虑钢衬与外包混凝土间的摩擦接触机制时,混凝土裂缝扩展规律与模型试验吻合更好,钢衬应力更为均匀,混凝土裂缝宽度普遍在0.3~0.4 mm,明显大于不考虑摩擦接触特性结果;随着钢衬与外包混凝土间摩擦系数的增加,管顶附近的变形不均匀程度逐渐增加,钢衬应力不均匀程度增加,不利于发挥钢衬的承载性能,但同时上半周裂缝处的钢筋应力峰值明显减小,应变不均匀程度减小,说明摩擦系数的增加有利于裂缝控制。
The Coulomb frictional contact model was used to simulate the frictional contact between the steel liner and the outsourcing reinforced concrete. The structural model of steel lined reinforced concrete pipe downstream of the Lijiaxia Hydropower Station dam was established. The influence of the internal water pressure on the initiation load, crack propagation, Deformation, the steel liner and the stress distribution characteristics of steel bearing capacity law. The results show that considering the frictional contact mechanism between steel lining and concrete, the crack propagation law of concrete is in good agreement with the model test, and the stress of steel lining is more uniform. The width of concrete crack is generally 0.3-0.4 mm, which is obviously larger than that without considering frictional contact With the increase of the friction coefficient between the steel lining and the concrete, the uneven deformation near the pipe roof increases gradually and the stress uniformity of the steel lining increases, which is unfavorable to the bearing performance of the steel lining, but at the same time, The peak stress of steel decreased obviously, and the degree of strain nonuniformity decreased, indicating that the increase of friction coefficient is in favor of fracture control.