盾构隧道管片接缝密封垫设计参数研究

Study on Design Parameters of Sealing Gasket for Segment Joints of Shield Tunnel

为了研究盾构隧道管片接缝密封垫设计参数,文章通过统计数据分析了盾构隧道管片接缝密封垫材质、断面形式、孔洞排布方式等设计现状。基于统计样本以密封垫底边长度为控制变量,对密封垫外轮廓参数进行了线性回归分析。采用数值模拟方法从密封垫闭合孔排数、闭合孔孔型、不同部位开孔率变化等方面分析了几何参数对密封垫防水设计的影响。参考我国相关规范推荐的橡胶硬度范围,分析了橡胶硬度参数对密封垫防水设计的影响。结果表明:盾构隧道管片接缝密封垫闭合孔采用双排孔形式防水效果最好;对孔布置形式能提供更好的防水效果;完全闭合压缩力、垫间平均接触压力均与开孔率呈负相关;橡胶邵尔硬度在60~70度范围内时,垫间平均接触压力与垫砼间平均接触压力均与橡胶硬度呈现线性正相关。

In order to study the design parameters of shield tunnel sealing gasket,firstly it analyzed the design sta⁃tus of sealing gasket material,section form and hole arrangement through statistical data.Based on the statistical samples,a linear regression analysis of outer contour parameters of gasket is conducted by taking the base length of gasket as a control variable.Secondly,the influence of geometric parameters on the waterproofing design of sealing gasket is analyzed by numerical simulation from the aspects of the number of rows of closing holes,pattern of closing holes and the changes of opening rates in different parts.Finally,referring to the range of rubber hardness recom⁃mended by relative national standards,the influence of rubber hardness parameters on waterproof design of the seal⁃ing gasket is analyzed.The results show that:the waterproof effect is the best with double-row pattern of closing holes of sealing gasket for shield tunnel segment joint;the waterproof effect is good with pair-hole pattern of closing holes;both the fully enclosing compression force and average contact pressure between gaskets have negative corre⁃lation with aperture ratio;if the Shore hardness of rubber is within the scope of 60-70,both the average contact pres⁃sure between gaskets and the average contact pressure between gasket and concrete have linear positive correlation with rubber hardness.