Study on Field Test of Deformation and Stability Control Technology for Shallow Unsymmetrical Loading Section of Super-Large-Span Tunnel Portal
Source abstract
Abstract
This study focuses on monitoring the deformation of the shallow unsymmetrical section of a super-large-span tunnel portal relying on the newly built Shimentangshan Tunnel, and through numerical simulations, the construction sequence and drift ratios were optimized to address challenges related to the stability of surrounding rock and structure. The findings indicate that employing the double-side drift method results in a maximum settlement value of 107.0 mm and a maximum convergence value of 108.8 mm, leading to larger deformations. Excavating the shallow buried side first followed by the deep buried side proves beneficial for deformation control of the support structure and effectively limits damage to the surrounding rock. A drift ratio of 0.3 ensures optimal support structure security and stability. Considering both structural deformation and surrounding rock damage, a ratio between 0.25 and 0.35 for the drifts is recommended. Taking into account construction efficiency and economic benefits, a construction plan for the shallow buried unsymmetrical section at the portal of super-large-span tunnels is proposed.
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Research context
OpenAlex topics: Geomechanics and Mining Engineering · Civil and Geotechnical Engineering Research
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
School of Highway, Chang’an University, Middle Section of Nan Erhuan Road, Xi’an 710064, China
Shandong Provincial Communications Planning and Design Institute Group Co., Ltd., No.576, Wuyingshanxi Road, Tianqiao District, Jinan 250031, China
Funding
National Natural Science Foundation of China · Science Fund for Distinguished Young Scholars in Shaanxi Province · Collaborative Research Project with Shandong Provincial Communications Planning and Design Institute Group CO., LTD.
References (34)
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