高水头弧形闸门伸缩式水封的黏弹性仿真计算方法  

Viscoelastic simulation of adjustable water seal for high head radial gates

作　　者：刘礼华[1] 熊威[1] 顾因[2] 张宏志[1] 

机构地区：[1]武汉大学土木与建筑工程学院,湖北武汉430072 [2]镇江船艇学院工程系,江苏镇江212003

出　　处：《水利学报》2006年第9期1147-1150,共4页Journal of Hydraulic Engineering

摘　　要：认为止水材料的蠕变和应力松弛是由于材料参数的变化而引起的,把描述橡胶类材料应变能密度函数中的物理参数假设成与时间有关的黏弹性函数。在此基础上改进材料应力张量与应变张量的关系式,得到了改进的Mooney-Rivlin公式,给出了一种考虑止水材料黏弹性性质的伸缩式水封仿真计算方法。分析得出,止水材料由于受周边结构的限制,材料黏弹性阶段除顶点垂直位移不变,关键结点的其它位移并没有因材料的蠕变而显著变化,材料的蠕变有提高封头顶点接触应力的趋势,不会降低水封的水密性。通过工程实例,给出了140m水头下、封头与面板间隙控制在30mm内的可行并较优的伸缩式水封的断面。It is assumed that the creep and relaxation of material caused by the variation of parameters of material, and the physical parameters of strain energy density function for rubber is assumed to be related to the viscoelastic function which is dependent on time history. On this basis, the relationship between stress matrix and strain matrix of material can be improved and an improved Mooney - Rivlin formula is derived. The simulation calculation method using this formula for adjustable water seal with the viscoelatic characteristics of material taken into account is proposed. The analysis result shows that when the material of seal is working in viscoelastic state not only the displacements of top water seal but also the other key points of the seal do not significantly change, in spite of the occurrence of creep. The creep of material will not reduce the water tight performance of the seal. A feasible section of expasion water seal is presented in which the gap between the seal and plate of gate should be controlled smaller than 30mm, An example is given to demonstrate the application of this simulation method.

关 键 词：止水材料 黏弹性 止水元件 时程分析 改进的Mooney-Rivlin公式 

分 类 号：TV663.2[水利工程—水利水电工程]