埋地储罐设计与FLAC3D数值模拟

Design of buried oil tank and FLAC3D numerical simulation

总结了目前国内常用的埋地储罐强度和稳定性设计方法,针对具体埋地储罐案例,进行了壁厚计算、稳定性校核和加强圈设置及尺寸确定。为验证理论设计的可靠性并准确掌握埋地储罐的变形及应力分布规律,借助ANSYS软件建立储罐及周围填土模型并导入FLAC3D,利用FLAC3D进行数值模拟;对比分析理论设计与数值模拟结果,得出结论:储罐理论设计是安全可靠的;设计过于保守,钢材强度利用率非常低;不设置加强圈的罐壁本身可满足稳定性要求,稳定性设计方法及公式偏于保守;无加强圈储罐,其封头强度及刚度均大于圆筒,应力和变形大小从两端封头到罐体中部递增,且二者在储罐整体上分布不均匀;有加强圈储罐,其应力及变形分布均较均匀,整体受力性能较好。(图7,参16)

This paper summarizes the methods commonly used in the strength and stability design of buried oil tanks in China and carries out the calculation of wall thickness, check of stability, setup of reinforcing ring and the calculation of its size. In order to verify the theoretical design of its reliability and accurately find out the deformation and stress distribution of buffed oil tanks, the model of oil tank and its surrounding soil is built by using ANSYS sot^ware and introduced into FLAC3D to conduct numerical simulation. Comparison on the theoretical design and the numerical simulation results shows that the theoretical design of oil tank is safe and reliable, but the design is too conservative, which leads to the low utilization ratio of the steel strength. The tank wall without reinforcing ring can meet the requirements of stability and the stability design methods and formulas are too conservative. The strength of head and stiffness of non-reinforcing ring oil tank is higher than the cylinder, and the stress and deformation increase from the two-heads to the middle part of the tank and the distribution of them on the whole tank is not balanced. The oil tank with reinforcing ring has a better mechanical performance because of the even distribution of stress and deformation. （7 Figures,16 References）