DOI: 10.11799/ce202506007
Construction technology of excavation and support for shaft boring machine under freezing method conditions
QIAO Wenjun
ZHANG Yanlin
YAO Man
TANG Chongmao
YANG Zhijiang
SHANG Xiangyu
ZHU Bin
Abstract：To improve the construction efficiency and safety of shaft boring machines(SBMs)under freezing conditions in soft and water-rich complex strata,we investigated the key technologies for excavation and support construction based on the mechanical characteristics of frozen rock masses,focusing on optimizing cutting parameters and support processes to establish a systematic technical scheme for frozen shaft construction.Full-scale experiments and parameter optimization analysis were conducted to explore the effects of cutting depth,drum rotation speed,and traction speed on rock-breaking efficiency and construction stability,and a high-efficiency shaft wall support model was proposed.The results show that the optimized low rotation speed and shallow cutting depth cutting process reduces cutting specific energy consumption,improved excavation efficiency,and effectively minimized frozen wall disturbance,thereby enhancing construction stability.Meanwhile,through applying the double-layer reinforced concrete shaft wall structure,combining with the external synchronous support method and internal segmented slip-forming process,the shaft wall quality was significantly improved.Additionally,the"excavation-support-muck removal"synchronous construction mode enhanced the overall construction efficiency.The research findings provide technical support for shaft construction in soft and water-rich complex strata under freezing conditions and serve as a reference for optimizing similar engineering projects.
Keywords：freezing methodshaft boring machineexcavation and support constructionshaft wall supportsoft rock formationsconstruction process optimization
Publication Date：2025-06-30
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：8( 49-56 )