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| Large deformation characteristics and mechanism analysis of high-stress carbonaceous slate tunnel |
| GUO Xinxin1, ZHU Anlong2, WANG Wanping3, WANG Bo1*, WANG Zhijiao4, WANG Zhenyu1
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1. Key Laboratory of Transportation Tunnel Engineering of Ministry of Education, Southwest Jiaotong University, Chengdu 610031, Sichuan, China;
2. PowerChina Huadong Engineering Co., Ltd., Hangzhou 311122, Zhejiang, China;
3. CCCC First Highway Consultants Co., Ltd., Xi'an 710075, Shaanxi, China;
4. Gansu Changda Highway Co., Ltd., Lanzhou 730030, Gansu, China |
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Abstract Taking the Muzhailing Highway Tunnel of Weiwu Expressway as the engineering background, the characteristics and mechanism of the large deformation of the high-stress carbonaceous slate tunnel were analyzed through the records of typical large-deformation disasters and rock mass characteristics. The results of the study showed that the carbonaceous slate tunnel mainly had two large deformation modes, namely conventional type and sudden type; for different lithological sections, the deformation of the surrounding rock was generally expressed as “corrugated developed carbonaceous slate section> thin monoclinic structural carbonaceous slate section> layered carbonaceous slate interbedded with sandy slate section(interbedded section)”; the deformation mechanism of carbonaceous slate mainly included “slab beam” bending deformation, interlayered structure bedding-slip and plastic flow. The corrugated development section was dominated by plastic flow, the thin monoclinic structure section was dominated by “slab beam” bending deformation, and the interbedded section was dominated by bedding-slip.
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Received: 17 June 2021
Published: 20 December 2021
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