侧向土抗力对海洋工程桩压屈稳定性分析

采油平台、外海开敞码头等海洋工程基桩较普通基桩相比,由于其桩身自由长度较长,受环境影响严重,需对其进行屈曲稳定性分析。然而,在以往的研究中,通常只分析基桩自身稳定性,不考虑侧向土抗力的作用,对侧向土抗力的研究也较少,使得计算结果往往偏于保守,不利于正确分析基桩屈曲稳定性。文章运用力学理论,采用Rize能量法,首先推导出了考虑桩侧土抗力的直桩轴压屈曲荷载计算公式,其次就公式与Euler理论不同进行了分析比较,最后就不同情况下侧向土抗力对桩基稳定性提高的影响程度进行了讨论。

Buckling stability analysis on ocean engineering piles upon lateral earth resistance

Compared with common piles,stability of ocean engineering piles need to be analyzed because of their length and engineering influence.However,researches are mainly focused on piles-self stability.Lateral earth resistance is hardly taken into account in stability calculation of ocean engineering piles.Firstly,we deduced the formula which contains the factor of lateral earth resistance by method of Rayleigh-Ritz.Secondly,we compared the differences of this formula and Euler theory.Lastly,we discussed different influences of Lateral earth pressure in different conditions.