盾构管片弹性橡胶密封垫防水性能灵敏度分析

为研究由生产加工造成的橡胶密封垫材料和几何参数的随机性对盾构管片接头防水性能的影响,选择密封垫橡胶的材料硬度﹑孔洞圆心坐标﹑孔径等参数作为随机输入变量,以密封垫表面平均接触应力为分析目标,运用ANSYSPDS随机分析模块计算各随机参数对表面平均接触应力的灵敏度数值,并在此基础上探究各随机参数的公差对密封垫防水性能的影响程度.对某城市地铁盾构隧道弹性密封垫的分析结果表明:橡胶材料力学参数是影响抗水能力的主要因素,尤其是C10.几何参数中,截面上部孔径的变化对下表面接触应力影响较大,而圆孔位置对临近表面的接触应力影响敏感,中部圆孔对上、下表面接触应力的影响程度相当.

Sensitivity Analysis of Water proof Performance of Elastic Rubber Gasket in Shield Tunnel

In order to study the influence of random material and geometrical parameters of rubber gasket caused by machining error on waterproof performance of shield tunnels lining joint, material hardness, coordinates of the bore center and diameter are selected as the random input variables, targeting the surface average contact pressures of gasket, to calculate the sensitivity values to contact pressures of all these random parameters by using the ANSYS PDS module. The results from an analysis of elastic gaskets used in a certain city metro shield tunnel show that rubber mechanic parameters are principal factors, especially C10. Among geometric parameters, there is more influence on down surface contact stress because of the variation of upper bores diameter in the section. However, positions of bore are sensitive to near surface contact stresses, and the variation of middle bores have almost the same influences on both surfaces.