Official PDF Translation•Journal of Central South University

Conversion of tunnel excavation methods and optimization of support measures under transformation of rock stratum: A case study

Authors: JIANG Hua; HU Hao; SHEN Qing-yun; ZHANG Ao

DOI: 10.1007/s11771-026-6234-1Status: Verified Translated Edition

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Key Findings in This Report

• Setting a transition section 6 m before a sudden rock mass change effectively controls deformation in layered strata. • Advance small pipe support significantly reduces tunnel arch settlement, while anchor bolts control horizontal convergence. • Adjusting anchor bolt angles is a cost-effective measure for asymmetric deformation in layered rock. • Recommended support optimization: flexible anchor bolt angles and increased advance small pipe support for rock stratum transitions.