A new rheological model and its application in mountain tunnelling
A new rheological model and its application in mountain tunnelling
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DOI：
10.1016/j.tust.2007.06.003
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发表时间：
2008-05-01
影响因子：
6.9
通讯作者：
Huang, Hongwei
中科院分区：
文献类型：
--
作者：
Guan, Zhenchang;Jiang, Yujing;Huang, Hongwei
在山区隧道的长期设计和维护中，应考虑软岩的时变特性，一般称为流变学。在经典的Burger-MC流变模型的基础上，提出了一种burger -劣化流变模型，并在FLAC（3D）数值代码中实现。该模型引入退化阈值和两个退化比，考虑岩体强度退化随时间的变化。提出的模型应用于一个工程实例（日本长崎Ureshino隧道1号线），以解释1992年11月完工后发生的延迟变形。模拟计算的延迟冠状沉降和逆隆起分别具有指数型和阶梯型特征，与现场监测数据定性吻合较好。此外，该模型所涉及的实际流变参数可以从现场监测数据中进行反分析。(C) 2007 Elsevier Ltd.版权所有。
The time-dependent features of soft rock, named rheology generally, should be taken into account in the long-term design and maintenance of mountain tunnels. Based on the classic Burger-MC rheological model, a Burger-deterioration rheological model is proposed in this paper and is implemented in the numerical codes FLAC(3D). A deterioration threshold and two deterioration ratios are introduced in this model to consider the time-dependent strength deterioration aspect of the rock mass. The proposed model is applied to an engineering instance (Ureshino Tunnel Line I, Nagasaki, Japan) to account for the delayed deformations that occurred after its completion since November 1992. The delayed crown settlement and invert upheaval computed from simulations are featured by an exponential characteristic and a stair-typed characteristic, respectively, which agree well with the in-site monitoring data qualitatively. In addition, the realistic theological parameters involved in the proposed model can be back-analyzed from the in-site monitoring data. (C) 2007 Elsevier Ltd. All rights reserved.