Large deformation control of soft rock tunnel is an unavoidable technical problem in long-distance water diversion project. The depth of Caijiacun tunnel in Kunming section of Central Yunnan Water Diversion Project is generally large. Also, fault structure and joint fissure are developed as long diagenetic age. During the construction process, the frequent occurrence of large deformations in the soft rock cave section causing intrusion and arch replacement poses a serious threat to the safety, progress, and cost of engineering construction. The large deformation conditions and reasons in the process of tunnel construction are summarized, and taking the upstream section of the 4# branch as an example to analyze deformation characteristics and the effectiveness of treatment measures using numerical simulation analysis method. On this basis, evaluation criteria of large deformation classification based on strength and strength-stress ratio is proposed. Also, comprehensive treatment guidelines including excavation bench, deformation allowance, advanced support, primary support and bedding layer is established, which effectively solves large deformation problems in subsequent soft rock tunnel sections. The research results can provide experience for tunnel construction under similar geological conditions.
Yang Xiaolong
,
Xiang Tianbing
,
Si Jianqiang
,
Wang Wei
,
Yang Yinglong
. Research of Large Deformation Treatment for Soft Rock in Caijiacun Tunnel of Central Yunnan Water Diversion Project[J]. Chinese Journal of Underground Space and Engineering, 2025
, 21(2)
: 629
-636
.
DOI: 10.20174/j.JUSE.2025.02.30
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