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兰渝铁路仓园隧道穿越结构松散、含水率高的泥石流堆积体,最小埋深仅14 m,隧道基底稳定性差、地基承载力低。在隧道基底常用处理方法比较分析基础上,采用树根桩进行隧道基底加固;采用数值试验模拟隧道施工过程力学行为特性及基底加固处理效果,并分析不同列车振动荷载频率下隧道基底在有、无树根桩情况下列车动载对隧道基底工后沉降和振动的动力响应规律;结合现场监测数据分析,提出了泥石流体隧道施工变形控制和基底加固方法,供类似工程设计和施工参考。
Lanzhou-Chongqing railway tunnel through the loose structure, high water cut debris flow body, the minimum depth of only 14 m, the tunnel foundation stability is poor, the foundation bearing capacity is low. Based on the comparative analysis of the commonly used methods of tunnel basement, the root reinforcement of the tunnel was carried out by using the root stump. The mechanical behaviors of the tunnel construction process and the reinforcement effect of the basement were simulated by numerical experiments. The tunnel foundation under different vibration frequencies was analyzed. Under the condition of tree stumps, the dynamic response of railway vehicle foundation to post-construction settlement and vibration is analyzed. Based on the analysis of on-site monitoring data, a deformation control and foundation reinforcement method for debris flow tunnel construction are proposed for similar project design and construction reference.