波浪作用下临海基坑非等长双排钢板桩受力性状研究
PDF下载 (159)罗战友,李 博,奚灵智,俞建强,莫修栋.波浪作用下临海基坑非等长双排钢板桩受力性状研究[J].宁波大学学报(理工版),2024,37(1):58-66.DOI:10.20098/j.cnki.1001-5132.2023.0812
LUO Zhanyou,LI Bo,XI Lingzhi,YU Jianqiang,MO Xiudong.The stress characteristics of non-equal length double-row steel sheet piles in coastal pits under wave action[J].Journal of Ningbo University(Natural Science & Engineering Edition),2024,37(1):58-66.DOI:10.20098/j.cnki.1001-5132.2023.0812
| Title: | The stress characteristics of non-equal length double-row steel sheet piles in coastal pits under wave action |
| 作者: | 罗战友, 李 博, 奚灵智, 俞建强, 莫修栋 |
| Author(s): | LUO Zhanyou, LI Bo, XI Lingzhi, YU Jianqiang, MO Xiudong |
| 关键词: | 临海基坑; 非等长双排桩; 计算模型; 波浪作用 |
| Keywords: | coastal excavation pit; non-equal length double row piles; calculation model; wave action |
| 分类号: | TU31 |
| DOI: | 10.20098/j.cnki.1001-5132.2023.0812 |
| 文献标识码: | A |
| 摘要: | 临海基坑工程考虑波浪作用影响, 常采用非等长双排钢板桩进行支护, 现有双排桩计算模型不适用于此类结构内力变形的计算. 为探究波浪作用对此类支护结构内力变形的影响, 根据其受荷及布置特点, 对现有计算模型中桩土作用力计算方法、前后排桩土压力分配模式及约束形式进行改进, 提出非等长双排钢板桩计算模型, 与有限元结果进行对比验证, 并分析波浪作用对非等长双排钢板桩结构内力变形的影响规律. 结果表明: (1)无波浪作用时, 基坑侧(前)排桩的弯矩峰值约为临海侧(后)排桩的2倍, 前、后排桩弯矩分别呈“抛物线”和“S”型分布; (2)无波浪作用时, 前、后排桩水平位移峰值相等且均出现在桩顶, 分别呈“对数函数”与“线性函数”型分布; (3)波峰作用下, 前、后排桩弯矩及水平位移变化规律与无波浪作用时基本一致, 但弯矩及水平位移最大值分别增大121%和87%左右; (4)波谷作用下, 前、后排桩弯矩及水平位移最大值显著减小, 但两者分布规律相较于无波浪作用时亦无较大差异. |
| Abstract: | Considering the influence of wave action, the offshore pit project is often supported by non-equal length double-row steel sheet piles, and the existing double-row pile calculation model is not applicable to the calculation of internal force and deformation of such structures. In order to investigate the influence of wave action on the internal force and deformation of this kind of supporting structure according to its loading and arrangement characteristics, the calculation method of pile-soil force, the soil pressure distribution mode of front and back rows of piles, and the form of constraints in the existing calculation model are improved, and the calculation model of non-equal length double-row sheet pile is proposed, which is validated by comparing with the results of finite element, and the influence of wave action on the structural deformation of non-equal length double-row sheet pile structure is analyzed. The results show that: (1) When there is no wave action, the peak bending moment of the piles on the pit side (front) is about twice that of the piles on the seaward side (back), and the bending moments of the piles on the front and back rows are distributed in a parabolic and S-shape, respectively; (2) When there is no wave action, the horizontal displacements of the piles on the front and back rows are, respectively, showing “logarithmic function” and “linear function” type distributions ,but the peaks of the horizontal displacements of the piles on the front and back rows are equal and both appear at the top of the pile; (3) Under the action of wave crest, the bending moment and horizontal displacement law of the front and back row piles are basically the same as those without wave, but the maximum values of bending moment and horizontal displacement increase by about 121% and 87%, respectively; (4) The maximum values of bending moment and horizontal displacement of the front and back piles are significantly reduced under the wave trough, but there is no big difference in the distribution of the two piles compared with the no wave condition. |
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| 备注/Memo: | 收稿日期: 2023－08－21. 宁波大学学报（理工版）网址: http://journallg.nbu.edu.cn/ 基金项目: 浙江省“万人计划”科技创新领军人才项目（2020R52028） .第一作者: 罗战友, 教授, 主要研究方向: 岩体结构面、隧道及桩基工程. E-mail: lzy0395@163.com 宁波大学学报（理工版）网址：http://journallg.nbu.edu.cn/ |
