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ZJUS-A
Journal of Zhejiang University-SCIENCE A (Applied Physics & Engineering)  2006, Vol. 7 Issue (11): 10-    DOI: 10.1631/jzus.2006.A1864
    
Study on effect of segments erection tolerance and wedge-shaped segment on segment ring in shield tunnel
CHEN Jun-sheng, MO Hai-hong
Department of Civil Engineering, South China University of Technology, Guangzhou 510640, China
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Abstract  Deformation and dislocations of segments of shield tunnel in construction stage have apparent effect on tunnel structure stress and even cause local cracks and breakage in tunnel. 3D finite element method was used to analyze two segment ring models under uniform injected pressure: (1) segment ring without wedge-shaped segment, which has 16 types of preinstall erection tolerance; (2) segment ring with wedge-shaped segment, which has no preinstall erection tolerance. The analysis results indicate that different erection tolerances can cause irregular deformation in segment ring under uniform injected pressure, and that the tolerance values are enlarged further. Wedge-shaped segment apparently affects the overall deformation of segment ring without erection tolerances. The uniform injected pressure can cause deformation of ring with wedge-shaped segment irregular, and dislocations also appear in this situation. The stress of segment with erection tolerances is much larger than that of segment without erection tolerances. Enlarging the central angle of wedge-shaped segment can make the irregular deformation and dislocations of segments smaller. The analysis results also provide basis for erection tolerance control and improvement of segment constitution.

Key words： Shield tunnel      Segment      Erection tolerance      3D finite element analysis     
Received: 06 January 2006     
CLC:  U455  
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CHEN Jun-sheng
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CHEN Jun-sheng, MO Hai-hong. Study on effect of segments erection tolerance and wedge-shaped segment on segment ring in shield tunnel. Journal of Zhejiang University-SCIENCE A (Applied Physics & Engineering), 2006, 7(11): 10-.

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http://www.zjujournals.com/xueshu/zjus-a/10.1631/jzus.2006.A1864     OR     http://www.zjujournals.com/xueshu/zjus-a/Y2006/V7/I11/10

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