文献类型：期刊文献

英文题名：Mechanical behaviour and failure mechanisms of special-shaped CFST supports in mining-disturbed soft-rock roadways

作者：Li, Bin Wu, Xukun Xu, Youlin Yan, Hong Wu, Shaokang

第一作者：Li, Bin

通信作者：Wu, XK[1]

机构：[1]China Univ Min & Technol, Sch Mines, Xuzhou 221116, Peoples R China;[2]Guizhou Inst Technol, Sch Min Engn, Guiyang 550003, Guizhou, Peoples R China;[3]China Univ Min & Technol Beijing, Sch Energy & Min Engn, Beijing 100083, Peoples R China

第一机构：China Univ Min & Technol, Sch Mines, Xuzhou 221116, Peoples R China

通信机构：corresponding author), Guizhou Inst Technol, Sch Min Engn, Guiyang 550003, Guizhou, Peoples R China.|贵州理工学院矿业工程学院;贵州理工学院;

年份：2026

卷号：32

外文期刊名：RESULTS IN ENGINEERING

收录：EI(收录号：20263421340102);Scopus(收录号：2-s2.0-105047786565);WOS:【ESCI(收录号:WOS:001857587900001)】；

基金：Guizhou Provincial Science and Technology Plan Project: Major Project No. 001 of the NSSYS Program under the Qian Ke He Platform (2025) .

语种：英文

外文关键词：Soft-rock roadway; Concrete-filled steel tube support; Cross-section; Failure mechanism; Mining disturbance

摘要：Large deformation and progressive instability are common in soft-rock roadways subjected to mining-induced stress redistribution, weak lithology, and water-sensitive strata. Although concrete-filled steel tube (CFST) supports offer high bearing capacity and good deformation compatibility, the influence of cross-section on load transfer, failure evolution, and support-rock interaction remains insufficiently understood. Taking the 1570 track roadway of Daniuchang Coal Mine as a case study, this study integrates field investigation, laboratory testing, numerical simulation, and in-situ monitoring to evaluate three special-shaped CFST support configurations: straight-wall semicircular, horseshoe-shaped, and elliptical sections. The results show that cross-section governs the load-transfer path, stress redistribution, deformation response, and failure evolution of the supports. The straight-wall semicircular configuration exhibited stress concentration at the arch-wall junction, resulting in local buckling and structural damage under high lateral loading. The horseshoe-shaped configuration enhanced floor confinement through its inverted arch, although localized shear failure remained possible near the corners. The elliptical configuration provided the most uniform stress distribution and stable plastic-zone development owing to its continuous curvature and closed-ring load-transfer path. Its ultimate compressive strain capacity was approximately 23% higher than those of the other two configurations. Field monitoring further showed that roadway deformation under elliptical CFST support decreased to 13-30% of that under conventional U-shaped steel support. Overall, the elliptical configuration provided the most favorable combination of load-transfer efficiency, deformation control, and structural stability among the three configurations.