顶管顶力计算方法比较分析

Comparative Analysis of Calculation Methods for Jacking Force of Jacking Pipes

顶力是顶管工程施工中最关键的参数,合理计算顶力对于顶管工程安全顺利的施工起着至关重要的作用。现阶段计算顶力的方法颇多,使用不同的计算方法会对计算结果产生一定影响。为此,文章总结了现阶段国内外的顶力(或摩阻力)计算方法,对比分析了现有计算方法的优缺点和适用性。结果表明:顶力计算的经验方法主要区别在于给出的单位面积摩阻力所对应的土层划分方法和考虑因素不同,以及相同土层管-土间单位面积摩阻力的取值不同;顶力计算的理论方法主要区别在于拱顶竖向土压力的计算方法不同,并且受顶管覆土深度影响较大;顶力数值模拟计算方法主要区别在于模拟程序基于的理论以及模拟过程中所考虑的施工因素不同。

Jacking force is the most important parameter in jacking pipe engineering, and reasonable calculation ofjacking forces plays an important role in safe and smooth pipe jacking construction. There are many calculationmethods for pipe jacking force at present, and the calculation results may be affected to some extent by different cal-culation methods. For this reason, calculation methods of jacking force(frictional resistance) were collected and acomparative analysis was conducted with aspects to the advantages, disadvantages and applicabilities. The resultsshow that as for the jacking force calculated by empirical formulae, the soil layer classifications corresponding to giv-en frictional force per unit area and relevant factors to be considered are different, and the values of frictional forceper unit area between pipe and soil in the same soil layer are also different; as for the jacking force calculated by theo-retical formulae, the calculation methods for vertical earth pressure at crown are different and much effected by thepipe buried depth; as for the jacking force calculated by numerical simulation, the selected theories for the simula-tion program and the construction factors to be considered during simulation are different.