In order to study the reasonable bench excavation method for large cross-section sandy loess tunnels, the longest loess tunnel of the Zhongwei to Lanzhou Railway is used as the research object. Some geotechnical tests in laboratory were carried out to obtain the surrounding rock parameters. The numerical simulation method was used to compare and analyze the deformation control effects of surrounding rock under the combination of three bench method, three bench seven step method, and three bench temporary inverted arch method with advanced pipe shed support, and consider construction progress and cost factors, a reasonable construction method was selected. Field test effort was carried out and the effectiveness of the reasonable construction method was evaluated. The research results show that: (1) For the settlement and horizontal convergence of the arch, the control effects of the three bench temporary inverted arch method and the three bench seven step method are equivalent, with the three bench method being the worst. (2) For the extrusion displacement of the work face, the three bench temporary inverted arch method has the best control effect, while the three bench seven step method has the worst control effect. (3) The on-site test results of the three bench temporary inverted arch method indicate that, the distribution of surrounding rock pressure along the tunnel circumference is relatively small, less than the calculated value of loose pressure in the specifications, and the surrounding rock is in an elastic-plastic state. The bending moment of the steel arch is small, the axial force is large, showing the characteristics of small eccentric compression, and the safety factor is less than the allowable value of the specification. (4) Based on the comprehensive numerical simulation and on-site testing results, the three bench temporary inverted arch and advanced pipe shed combination construction method takes into account the construction speed and surrounding rock deformation control requirements, and can be used as the optimal construction method for large cross-section sandy loess tunnels.
Qiao Shigang
,
Yang Guangqing
,
Cao Kangling
,
Wang Jinghe
. Research on Bench Excavation Method for Large Section Sandy Loess Tunnel[J]. Chinese Journal of Underground Space and Engineering, 2025
, 21(2)
: 600
-609
.
DOI: 10.20174/j.JUSE.2025.02.27
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