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A new approach to obtain tunnel support pressure for polyaxial state of stress

机译：获取多轴应力状态下隧道支护压力的新方法

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摘要

Nowadays the numerical approaches to the tunnels designing are widely integrated to the traditional technologies (Empirical, Analytical and Observational Approaches). The numerical suites have, in fact, the advantage of an intrinsic simplicity of use and the ability to solve problems that, because of the complexity and plurality of the factors at play, cannot be easily managed through the analytical and empirical methodologies. Unfortunately the numerical software applications, commercially available for geo-mechanical purposes, have the limitation of using only the most famous constitutive models. This study sets the target of extending the numerical applicability of a constitutive model different from the commonly used one to increment the choice of model codes available for geotechnical numerical suites. In this paper a general methodology to extend the applicability of the Polyaxial Strength Criterion, introduced by Singh et al., to any numerical application is explained. The present procedure does not require any specific compilation of numerical constitutive model and takes advantage of the bi-dimen-sional Mohr-Coulomb model already present in every numerical suite. The Polyaxial Strength Criterion is a tri-dimensional constitutive model, introduced in 1998 for the analysis of severe squeezing in underground excavations. The present approach has shown high coefficients of correlation with the observations in many cases of tunnels in high squeezing conditions In Himalayan region.
机译：如今，隧道设计的数值方法已广泛集成到传统技术中（经验，分析和观测方法）。实际上，数值套件具有使用固有的简单性和解决问题的能力，这些问题由于复杂性和所起作用的多种因素而无法通过分析和经验方法轻松地进行管理。不幸的是，为地质机械目的可商购的数值软件应用程序具有仅使用最著名的本构模型的局限性。这项研究设定了扩展本构模型数值适用性的目标，该本构模型不同于常用的本构模型，以增加对岩土数值套件可用的模型代码的选择。在本文中，解释了由Singh等人介绍的将多轴强度准则的适用性扩展到任何数值应用的通用方法。本程序不需要数值本构模型的任何特定编译，并且利用了每个数值组中已经存在的二维Mohr-Coulomb模型的优势。多轴强度准则是一种三维本构模型，于1998年引入，用于分析地下基坑的严重挤压。在喜马拉雅地区高挤压条件下的许多隧道中，本方法已显示出与观测值相关的高相关系数。

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