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基于接触非线性理论,考虑钢蜗壳与外围混凝土的接触滑移,采用仿真算法对充水保压蜗壳进行了三维仿真分析和平面轴对称仿真分析.研究了机墩和设备质量及平面轴对称简化模型对蜗壳打压后的变形、蜗壳与混凝土的间隙及其应力的影响.计算结果表明:机墩及设备质量对钢蜗壳的应力影响较小,但对钢蜗壳与外围混凝土的间隙和外围混凝土的应力影响较大,三维仿真模型应该考虑机墩及设备的质量;平面轴对称仿真模型虽未考虑闷头在仿真分析中的作用,但能反映钢蜗壳和外围混凝土的变形特征与受力特性,可以在初步设计时采用.
Based on the contact nonlinear theory, considering the contact slip between the steel spiral case and the surrounding concrete, a three-dimensional simulation analysis and a plane axisymmetric simulation analysis of the water-filled pressure retaining spiral case were carried out by using the simulation algorithm. Symmetrical simplified model of the volute after the deformation of the pressure, the volute and the concrete gap and its stress. The results show that: the mechanical pier and the quality of the equipment has little effect on the steel spiral case, but the steel spiral case and the external concrete And the stress of the surrounding concrete have a greater impact. The 3D simulation model should consider the quality of the pier and equipment. The plane axisymmetric simulation model does not consider the role of the bulkhead in the simulation analysis, but it can reflect the deformation of the steel volute and the surrounding concrete Features and stress characteristics, can be used in the initial design.