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邵光辉, 苏毅, 赵志峰. 均质土中钢顶管顶进稳定性的能量法分析[J]. 岩土工程学报, 2016, 38(8): 1490-1496. DOI: 10.11779/CJGE201608017
引用本文: 邵光辉, 苏毅, 赵志峰. 均质土中钢顶管顶进稳定性的能量法分析[J]. 岩土工程学报, 2016, 38(8): 1490-1496. DOI: 10.11779/CJGE201608017
SHAO Guang-hui, SU Yi, ZHAO Zhi-feng. Energy method for stability of steel jacking pipes during construction in uniform soil[J]. Chinese Journal of Geotechnical Engineering, 2016, 38(8): 1490-1496. DOI: 10.11779/CJGE201608017
Citation: SHAO Guang-hui, SU Yi, ZHAO Zhi-feng. Energy method for stability of steel jacking pipes during construction in uniform soil[J]. Chinese Journal of Geotechnical Engineering, 2016, 38(8): 1490-1496. DOI: 10.11779/CJGE201608017

均质土中钢顶管顶进稳定性的能量法分析

Energy method for stability of steel jacking pipes during construction in uniform soil

  • 摘要: 顶管作为一种非开挖技术,越来越多地应用于各种地下管线工程。钢顶管在顶进过程中,如果顶力控制不当,可能发生轴向整体屈曲,从而导致管体结构失稳破坏。针对这一问题,考虑管周土体的约束、管-土摩阻力以及轴线偏差引起的初弯曲等作用,建立并求解了均质土中钢顶管在轴向顶力作用下的能量方程,获得了临界顶力荷载的解析解。然后,从轴线偏差、管周土体地基反力系数、管-土摩阻力方面分析了钢顶管轴向整体稳定系数的变化规律。钢顶管轴向整体稳定系数随长细比增大而减小,轴线偏差显著降低了钢顶管的轴向整体稳定性。顶管周围土体的约束作用增大了钢顶管轴向整体稳定性。管土摩阻力对钢顶管的轴向整体稳定性影响很小,可以忽略不计。均质土中的钢顶管轴向稳定性规律不同于一般的钢结构,临界顶力荷载解析解可以为钢顶管设计提供依据。

     

    Abstract: As a trenchless technology, the jacking pipe has been used in more and more underground pipe line projects. The steel jacking pipe may have overall bucking by improper jacking force during construction. Pipe structure will fail by the instability. To deal with this problem, several effects such as constraint of surrounding soil, fraction between soil and pipe and initial bending of pipe are considered. The analytical solution of critical jacking force is deduced by the energy method. The laws for coefficients of stability development are discussed in the aspects of initial bending, coefficient of subgrade reaction of surrounding soil and fraction stress between soil and pipe. The overall stability coefficients decrease with the increasing slenderness for initial bending jacking pipe. The axis line deviation significantly reduces the overall stability. On the other hand, the constraint of surrounding soil strengthens the overall stability. The fraction stress between soil and pipe has little influence on the overall stability and can be ignored. The laws for the overall stability of steel jacking pipes in uniform soil are very different from those for the ordinary steel structural members. The analytical solution of critical jacking force can be used for the design of steel jacking pipes.

     

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