膨胀性土层盾构隧道衬砌管环计算模型

针对膨胀性岩土地层围压改变对盾构隧道衬砌管环内力和位移的影响,分析不同膨胀地层分布下隧道膨胀接触压力分布特征,建立考虑膨胀荷载的盾构隧道荷载-结构力学模型,运用力法推导不同膨胀荷载模式作用下衬砌管环内力解析解,并结合工程实例进行计算分析。研究结果表明,膨胀荷载对衬砌管环内力影响显著,不同膨胀荷载分布模式作用下衬砌管环内力分布规律存在较大差异,建议在工程设计中应予以重视。研究成果可为膨胀性岩土地层盾构隧道设计与计算分析提供参考。

Calculation Model of Shield Tunnel Segment Ring in Swelling Soil Strata

According to the influence of confining pressure change of swelling rock and soil strata on the internal force and displacement of shield tunnel lining ring,the distribution characteristics of expansion contact pressure of tunnel under different expansion stratum distribution were analyzed,and the load-structure mechanics model of shield tunnel considering the expansion load was established.Analytical solutions of the internal force of the lining ring under different expansion load modes were derived by using the force method,and the calculation and analysis was performed by combining with engineering examples.The results show that the expansion force has a significant effect on the internal force of lining ring,there is an obvious difference of the distribution laws of internal force of lining ring in different expansion load distribution modes,which should be stressed in engineering design.The research provides reference for the design and analysis of shield tunnel in expansive rock and soil region.