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Stress redistribution and ground arch development during tunneling |
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| Authors: | Chee Nan Chen Wen-Yen HuangCheng-Tsung Tseng |
| Affiliation: | a Department of Construction Engineering, National Taiwan University of Science & Technology, 43, Section 4, Keelung Road, Taipei 10672, Taiwan, ROC b Construction and Planning Agency, Ministry of the Interior, No. 342, Sec. 2, Bade Rd., Songshan District, Taipei City 10556, Taiwan, ROC c Graduate Research Scholar, Department of Construction Engineering, National Taiwan University of Science & Technology, Taipei, Taiwan, ROC |
| Abstract: | Three-dimensional stress adjustment caused by tunneling is related with ground arching development. Investigating the development of ground arching by stress redistribution during tunneling is presented. A three-dimensional numerical simulation model was developed to gain understanding of adjustment of tunneling stress. Vertical stress adjustments σZZ above the tunnel roof during tunneling are analyzed, using four different cover depths H and four lateral pressure coefficients K. Shift of the inflection points of σZZ-depth curves above the tunnel roof during tunneling can be a reliable index to show the development of ground arching. |
| Keywords: | Bench cut tunneling Cycle Ground arching σZZ-depth curves Triple-circular section |
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