摘要
以西南某山区高速公路上高填方路堤为研究载体,通过路堤下伏约15 m厚可塑-软塑状软弱土层的组成、结构和力学性状等,以及原设计的19 m高填方路堤实施方案,分析路堤实施中仅仅加载至13 m后就发生滑移变形灾害,研究了灾害形成的过程和发生发展机制,并对灾害进行处治后仍两次再度发生滑移失稳的情况和形成机制进行了论述,剖析了各个阶段滑移失稳后处治方案的失误及原因。运用了FLAC3D对路堤滑移失稳机制的数值模拟,模拟结果与现场实际情况基本吻合,证实了灾害机制研究结论的可靠性。正确掌握失稳机制,采取有针对性的治理措施才能根治病害。
Taking the high fill embankment on a mountainous expressway in the southwest as study object, this paper, on the basis of composition, structure and mechanical properties of the plastic-soft plastic soft soil stratum about 15 m deep lying under the embankment, and the scheme of embankment in 19 m high designed originally, analyzed the formation and development mechanism of sliding deformation disaster which arises in case of loading by only 13 m in embankment construction. In addition, the sliding failure happened twice again after the disaster treatment and the formation mechanism thereof were discussed with the fault and reason of the treatment measures in each stage after the sliding failure. Then, with FLAC3D, numerical simulation was carried out on the mechanism of sliding failure. The simulation result agreed with the actual situation on site substantially, verifying the reliability of the conclusion resulting from the disaster mechanism study. Understanding the failure mechanism correctly with targeted measures may control the disaster permanently.
出处
《路基工程》
2015年第5期187-192,共6页
Subgrade Engineering
关键词
高速公路
软弱地基
高填方路堤
滑移
机制
expressway
soft foundation
high fill embankment
sliding
mechanism
