悬臂式钢板桩弹性地基梁模型修正及嵌固深度算法优化  

Modification of cantilever steel sheet pile elastic foundation beam model and optimization of embedding depth algorithm

作　　者：陈瑞生 侯向阳 周小勇[1] CHEN Ruisheng;HOU Xiangyang;ZHOU Xiaoyong(Faculty of Engineering,China University of Geosciences,Wuhan 430074,China;China Railway 16th Bureau Group No.3 Engineering Company Limited,Huzhou 313000,China)

机构地区：[1]中国地质大学(武汉)工程学院,湖北武汉430074 [2]中铁十六局集团第三工程有限公司,浙江湖州313000

出　　处：《辽宁工程技术大学学报(自然科学版)》2025年第1期35-42,共8页Journal of Liaoning Technical University (Natural Science)

基　　金：国家自然科学基金项目(11902296)。

摘　　要：为研究考虑桩底被动抗力条件下悬臂式钢板桩的变形及嵌固深度,通过查阅文献对大量悬臂式钢板桩基坑支护开展计算,发现在悬臂式钢板桩底部存在一个反向变形弯曲点,根据桩体所受土压力对反弯点的弯矩平衡方程求解反弯点位置,以基坑底面和反弯点将支护结构分为三部分并进行变形受力分析,根据边界条件及连续性条件求解各部分桩体的挠曲方程,计算得到悬臂式钢板桩的嵌固深度。研究结果表明:不同土层、深度的基坑反弯点位置具有一定的规律性,修正方法考虑了反弯点以下土体的被动抗力,更符合悬臂式钢板桩的实际受力情况,计算结果安全性更高。To investigate the deformation and embedment depth of cantilever steel sheet pile walls considering the passive resistance at the pile base,a comprehensive review of relevant literature was conducted,coupled with extensive calculations for cantilever pile excavation support systems.It was observed that a reverse bending point exists at the base of the cantilever steel sheet piles.The position of the inflection point was solved according to the bending moment equilibrium equation of the soil pressure on the pile.The retaining structure was subsequently divided into three sections based on the excavation bottom and the reverse bending point,and deformation and force analyses were performed for each section.Differential equations governing the deflection and bending of each pile segment were established.By applying boundary and continuity conditions,the deflection equations for each pile segment were solved,leading to the determination of the embedment depth for cantilever steel sheet piles.The research resultes indicate that the locations of reverse bending points exhibit certain regularities across different soil layers and excavation depths.The proposed modification method not only accounts for the passive soil resistance below the reverse bending point but also aligns more closely with the actual force conditions experienced by cantilever steel sheet piles,resulting in safer and the calculation results are safer.

关 键 词：基坑工程 悬臂式钢板桩 弹性地基梁 被动抗力 嵌固深度 

分 类 号：TU312[建筑科学—结构工程]