冰与海洋结构物作用的极限承载力

THE ULTIMATE BEARING CAPACITY OF THE INTERACTION BETWEEN ICE AND OFFSHORE STRUCTURES

为进一步研究冰与海洋结构物作用时的变形和影响,论文将岩土力学中的Smith屈服准则引入到冰材料的弹塑性分析中,从细观力学的角度分析了孔洞存在以及拉、压破坏强度不同的条件下冰材料的力学性能,构造了冰的本构方程;采用分区构造方法分析给出冰与矩形直立结构物作用时应力场的解析解;最后用数值计算的方法分析给出不同压力敏感性参数和拉压强度比下冰的极限承载力.分析结果表明Smith屈服准则能够准确反应孔洞的存在及拉压屈服强度不同对冰材料力学性能的影响.

In order to study the deformation of ice and the interaction between ice and the offshore platform structures, the Smith yield criterion for geotechnical mechanics is introduced into the elasto-plastic analysis of ice. First,the mechanical properties of ice which are affected by the existence of cavity and the different tensile-compression strength ratios were analyzed based on the meso-mechanics,and the constitu- tive equation was established. Then the analytical solution of stress field caused by interaction between ice and the rectangular vertical structure were deduced by structure partition method. Finally, the ultimate bearing capacity of ice was discussed with different pressure-sensitive coefficients and tension-compression ratios by numerical analysis. The results show that the Smith yield criterion could reflect correctly the ex- istence of cavities and the effect of different tension-compression yield strengths on the ice mechanical properties.