毕业设计外文翻译(12)

(2) The internal force value of tunnel structure minish and the numbers of cracks reduce after the shock absorption layer is set up in model test, at the same time it can greatly reduce the earthquake destruction and optimize the stress state of tunnel. So it is provide a certain reference for the anti-seismic design and construction of mountain tunnel in high-intensity earthquake area.

(3) The surface cracks of tunnel model appear firstly on both spandrels and develop diagonally in tunnel entrance. The cracks arise "X"-shape distribution on the surface of the model soil, at the same time it is proposed that the slope of tunnel portal should be reinforced in order to prevent the secondary disasters(such as landslide, slope instability, etc) due to earthquake

(4) There are a lot of circumferential cracks at tunnel portal under the condition of dynamic loads, and most of longitudinal cracks or oblique cracks can terminate when extending to the circumferential cracks. So that it is proposed that there should be set up more shock absorption seams in the vicinity of tunnel portal in order to be propitious to damping the earthquake energy. Acknowledgements

This study is funded by the Postdoctoral foundation of China (No.20080431267), the National Natural Science Foundation of China(No.50878187) and the Foundation of Southwest Jiaotong University(No. 2007B19)

References

Chen, G. X. (2006). A large-scale shaking table test for dynamic soil-metro tunnel interaction test scheme. Earthquake engineering and engineering vibration, 26(6):178~ 183.

Gong, B. N. (2002). Experimental Research on Dynamic Interaction of Underground Structure and Soil[J]. Journal of China Three Gorges Univ, (6):493~496. Li, Y. S. (2006). Study on earthquake responses and vibration-absorption measures for mountain tunnel. Shanghai:

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