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首页> 外文期刊>KSCE journal of civil engineering >Stability Analysis for Cofferdams of Pile Wall Frame Structures
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Stability Analysis for Cofferdams of Pile Wall Frame Structures

机译：桩壁框架结构围堰稳定性分析

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摘要

Pile wall frame structures (PWFSs) are double-wall sheet-pile structures with an integrally precast framework of reinforced concrete to connect double rows of closely placed piles. An engineering test on a cofferdam of PWFSs was conducted in Binzhou, where lateral displacement along pile shaft was carefully monitored during the hydraulic filling process. A 3D finite element model (FEM) of the test was established to study the stability failure mechanism of PWFSs. Then, a design method for PWFSs was proposed through a structural stability analysis based on the limit equilibrium method, with special consideration of the cutting pile force influenced by row spacing. According to FE results, lateral pile displacements drawn from the FEM correspond well with field observations, and earth pressures applied on closely spaced piles are in line with Rankine's theory. Results of the theoretical analysis indicate that the control slip surface lies on the bottom of a soil layer with a poorer shear strength index. The effects of framework width, pile spacing, pile length and diameter on structural stability are also evaluated. The feasibility of PWFSs has been verified by an engineering test, and the simplified design method established here is reasonable and effective for structural stability prediction.
机译：桩壁框架结构（PWFS）是双壁板桩结构，具有一体的钢筋混凝土预制框架，以连接双行紧密放置的桩。在滨州进行了对PWFSS的围堰的工程测试，在液压灌装过程中仔细监测沿着桩轴的横向位移。建立了试验的3D有限元模型（FEM），以研究PWFSS的稳定性故障机制。然后，通过基于极限平衡法的结构稳定性分析提出了PWFS的设计方法，特别考虑了由行间距影响的切割桩力。根据FE结果，从FEM汲取的侧桩位移对应于现场观测，并且在紧密间隔桩上施加的地球压力符合兰诗的理论。理论分析的结果表明控制滑动表面位于具有较差剪切强度指数的土壤层的底部。还评价了框架宽度，桩间距，桩长和直径对结构稳定性的影响。通过工程测试验证了PWFS的可行性，这里建立的简化设计方法是合理的，对于结构稳定性预测是合理的。

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