期刊
INTERNATIONAL JOURNAL OF ROCK MECHANICS AND MINING SCIENCES
卷 55, 期 -, 页码 139-150出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijrmms.2012.07.007
关键词
Numerical investigation; Floor heave; Tunnel; Humidity diffusion
资金
- National Basic Research Program of China (973 Program) [2011CB013 503]
- National Natural Science Foundation of China [51121005, 51004020]
- China Postdoctoral Science Foundation [201104563]
- Fundamental Research Funds for the Central Universities [DUT12ZD102]
A humidity diffusion based numerical model is proposed to simulate the floor heave processes of swelling rock tunnel when it exposed to high humidity. The phenomenon of swelling in tunneling is treated as a humidity-mechanical coupled process, i.e. the stress redistribution as well the water vapor diffusion around the tunnel is taken into account. This allows one to model the observed floor heaves realistically without considering the complex chemical processes induced by water-rock interaction. Furthermore, the development of heave and pressure over the course of time can be studied. The swelling rock is considered as an elasto-plastic material with damage threshold, which allows one to predict the large heaves of a tunnel floor that are often observed in-situ. The relationship between the mechanical damage and humidity diffusion are discussed at the mesoscopic level. By studying the influence of parameters in the numerical model on the floor heave behavior, the time-dependent deformation and failure processes of tunnel under high humid condition are discussed in detail. The deformations at the floor level are larger than that of sidewalls interpreted here as a consequence of different humid boundary conditions. The numerical results provide a better understanding of time-dependent behavior of floor heave of tunnel under the high humid condition. Crown Copyright (C) 2012 Published by Elsevier Ltd. All rights reserved.
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