Analysis and remedial treatment of a steel pipe-jacking accident in complex underground environment
Analysis and remedial treatment of a steel pipe-jacking accident in complex underground environment
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DOI：
10.1016/j.engstruct.2013.10.025
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发表时间：
2014-02
影响因子：
5.5
通讯作者：
L. Zhen;Jin-jian Chen;P. Qiao;Jian-Hua Wang
中科院分区：
文献类型：
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作者：
L. Zhen;Jin-jian Chen;P. Qiao;Jian-Hua Wang
钢顶管由于具有自密封、耐高压、对环境影响小等优点，在给水、污水管道建设中得到了广泛应用。钢顶管的发展趋势是更大的直径，更长的掘进长度，更好地适应更复杂的地下条件。钢管顶管采用柔性管，与混凝土顶管采用刚性管不同。随着直径和掘进长度的增加，复杂地下条件下深埋钢管顶进的力学特性给设计人员提出了新的挑战。本文通过一个复杂地下环境下的顶管工程实例，分析了顶管工程的受力及稳定性。采用有限元法分析了高水土压力作用下的大挠曲原因和局部屈曲事故。结果表明，在这种特殊情况下，围压和顶推力共同作用导致了屈曲。提出了两种主要的补救方案：一是增加管壁厚度，二是在发生大挠度的管道上加装加劲肋。介绍并评价了两种补救方案的效果。特别是在不同的挠曲段采用不同的加劲肋灌浆，以减少摩擦，降低相应的轴向顶推力。该方法表明，在采取整改措施后，该管道的结构强度达到了要求。通过对该案例的分析和补救处理，可为同类顶管工程的有效设计和施工提供参考。
Steel pipe-jacking has been widely used in the construction of water supply and sewage pipelines because of its self-sealing qualities, ability to withstand high pressure and lower environmental impact. The trend in steel pipe-jacking is towards larger diameters, longer drive lengths, and better adaptation to more complex underground conditions. Steel pipe-jacking, in which a flexible pipe is used, is different from concrete pipe-jacking where a rigid pipe is used. With increasing diameters and drive lengths, the mechanical characteristics of deep-buried steel pipe-jacking in complex underground conditions have presented new challenges for designers. In this study, the forces involved and the stability of steel pipe-jacking are analyzed by examining an example of steel pipe-jacking in a complex underground environment. The causes of high deflection under elevated water and earth pressure and local buckling incidents are investigated by the finite element method. The results show that, in this particular case, confining pressure combined with jacking force leads to buckling. Two main remedial schemes are proposed: one is to increase the wall thickness of the pipe, and the other is to install stiffening ribs on the pipe where high deflection occurs. The effect of the two remedial schemes is presented and evaluated. In particular, various stiffening ribs are used in different deflection sections with grouting to decrease friction and lower the corresponding axial jacking force. This approach demonstrates that the structural strength of the pipeline has met the requirements after the rectification action is taken. The analysis and remedial treatment for this case study will provide a reference for effective design and construction of similar steel pipe-jacking.