盾构隧道管片的抗弯承载力对于隧道建设至关重要,足够的抗弯承载力可以保障隧道工程的整体稳定和安全。目前关于盾构隧道管片抗弯承载力的研究仍不足,难以全面预测盾构隧道管片在实际工况中的表现。本研究基于标准化的盾构隧道管片抗弯承载力检测方法,结合足尺抗弯试验,对深汕铁路龙岗盾构区间的盾构隧道管片抗弯承载力进行了测试,并使用规范设计计算方法对足尺管片抗弯试验的有效性进行了验证,并采用有限元数值模拟方法进一步分析了偏心受压状态下的管片抗弯承载性能。结果表明,随着荷载施加位置越靠近盾构隧道管片的端部,管片可承受的压力也随之增加,管片中心位置所需提供抗弯承载力逐渐降低,端部所需提供的抗弯承载力呈现先增大后减小的变化规律；将理想状态下管片可承受的极限承载力施加在各偏心工况下时,管片中心的位移逐渐降低,端点位移呈现出先增大后减小的变化趋势。

The flexural bearing capacity of shield tunnel segments is crucial for tunnel construction, as sufficient flexural bearing capacity ensures the overall stability and safety of tunnel engineering. Currently, there is insufficient research on the flexural bearing capacity of shield tunnel segments. This study employs a standardized method for detecting the bending capacity of shield tunnel segments, complemented by full-scale bending tests, to evaluate the bending capacity of segments in the Longgang shield section of the Shenzhen Shantou Railway. The effectiveness of the full-scale bending tests was verified using standard design calculation methods, and the bending capacity of the segments under eccentric compression was further analyzed through finite element numerical simulation methods. The results indicate that as the load is applied closer to the end of the shield tunnel segment, the pressure that the segment can withstand increases. The bending bearing capacity required at the center of the segment gradually decreases, while the bending bearing capacity required at the end initially increases and then decreases. When the ultimate bearing capacity that the segment can withstand under ideal conditions is applied to various eccentric working conditions, the displacement at the center of the segment gradually decreases, and the displacement at the endpoints shows a trend of initially increasing and then decreasing.

U455.43 ???? ????? ???

国家资助博士后研究人员计划(GZC20242129)