Jul 2026· Engineering Research Express· Vol 8, pp. 135120· 0 citations· 31 references
Physics
Abstract
Severe large-deformation hazards, including support cracking and face instability, occurred at the Liren Tunnel entrance, which traverses complex composite strata of weathered tuff and silty soil. This study investigates failure mechanisms under coupled hydro-induced deterioration and engineering disturbances. Laboratory tests quantified significant water-induced strength attenuation in both the tuff skeleton and silt filler, revealing a superimposed weakening mechanism that drastically reduces stratum bearing capacity. FLAC3D simulations integrated these parameters, confirming groundwater as the core trigger (increasing displacement by 80%) compared to the dry state, while inadequate construction methods amplified deformation. Consequently, a targeted combined control technology comprising an optimized three-bench method with reserved core soil, composite advance support, and strengthened primary support was implemented. Field monitoring validated this solution, reducing crown settlement by approximately 50% and shoulder convergence by 70%, effectively preventing further failures.
Large deformation is one of the most critical hazards in tunnels excavated under complex geological conditions. It often causes significant economic losses and threatens construction safety. For layered soft rock tunnels subjected to high in situ stress, the deformation and failure mechanisms are largely governed by th...
Rui-Qi Guo, Jun-Qi Lai, Tian-Zhu Ye et al.· Applied Sciences· 0 citations
The rapid expansion of pumped storage power stations in China highlights a critical engineering challenge: ensuring the stability of large-span underground caverns excavated in intensely fractured, mosaic-fragmented rock masses under low in-situ stress. Taking the Liyang Pumped Storage Power Station as a case study, th...
To address the persistent large deformation and recurrent instability of the deep soft-rock chamber at the auxiliary shaft station of Yilan No. 3 Mine after repeated rehabilitation, this study systematically investigated the surrounding-rock instability mechanism and grouting-based synergistic rehabilitation method by...
Peng He, Gang Li, Zhi-Yong Fu et al.· ACS Omega· 0 citations
Surrounding rock deformation and loosening zone thickness are critical parameters for tunnel support design and stability evaluation. This study examined the variable-cross-section Qingshan Tunnel on the Ren-Zun Expressway. Systematic field monitoring measured surrounding rock pressure, displacement, and loosening zone...
Nai-Tao Zheng, You-Yun Li, Zhi-Feng Wang et al.· Frontiers in Earth Science· 0 citations
Anti-flotation stability is a critical concern for shield tunnels constructed in water-rich strata, particularly for twin shield tunnels, where excavation-induced disturbance interacts with groundwater buoyancy. This study investigates the influence of segment thickness on the anti-flotation stability of twin shield tu...
Xuan-Sheng Cheng, Xian-Hui Cao, Zhi-Kai Xiong et al.· Engineering Research Express· 0 citations
Water loads on subsea tunnel linings are governed by the combined effects of seepage, structural deformation, and the grouting zone. However, these factors are often treated separately in existing analytical studies. In this study, an analytical model is developed for steady-state saturated seepage around a deep-buried...
Jian Wang, Xiu-Ying Wang, Zhong-Sheng Tan et al.· Water· 0 citations
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