微型钢管桩复合土钉墙有限元分析

Finite element analysis on the compound wall with soil nails and micro steel pipe piles

根据微型钢管桩复合土钉墙研究现状,结合工程实践,介绍了有限元数值分析软件Plaxis8.2在微型钢管桩复合土钉墙设计方面的应用和验证情况,实践证明,Plaxis8.2能够较准确、可靠地模拟该类型支护结构。总结了计算微型钢管桩、土钉及混凝土面层相关参数的参考公式。并通过代表性的示例研究,分析了微型钢管桩在不同土层结构、相同土钉墙设置条件下对基坑稳定性和控制位移的作用规律,即土层越硬,钢管桩对基坑安全稳定性的贡献作用越大;土层越软,钢管桩对坡顶最大位移控制的贡献作用越大。

Based on the current researches of the compound wall with soil nails and micro steel pipe piles as well as engineering practice, the application and verification of the finite-element numerical analysis software Plaxis 8.2 in the compound wall are presented. The application shows that Plaxis 8.2 could simulate this type of supporting structure accurately and reliably. The reference formulas for calculating the parameters of micro steel pipe piles, soil nails and concrete surface layer are summarized. Through the representative examples, the action laws related to the stability of foundation pit and the controlling displacement of micro steel pipe piles under the conditions with the different soil structure and the same soil nails are analyzed. The harder the soil layer is, the greater the contribution of steel pipe piles to the ultimate safety and stability of foundation pit is ; the softer the soil layer is, the greater the contribution of the steel pipe piles to the control of the maximum displacement at slope top is.