【作者】 李继才；

【导师】 朱召泉；

【作者基本信息】 河海大学 ， 结构工程， 2004， 硕士

【摘要】 预应力土锚能有效地控制钢板桩的水平位移、改善钢板桩的受力情况，淮安三线船闸在国内首次将压力分散型土锚钢板桩结构应用于永久性结构。压力分散型土锚钢板桩结构是一种结构型式新颖、受力机制合理的结构，特别是压力分散型土锚的受力与传力机制与传统的土锚相比更具合理性，粘结应力分布更均匀，防腐性能与耐久性能大为提高。 本文简单回顾了土锚、钢板桩及土锚钢板桩结构在工程中的各种应用，研究了土锚钢板桩结构的计算分析方法。钢板桩的竖向弹性地基梁法在工程设计中具有较强的实用价值，本文在ANSYS软件中实现了考虑土锚钢板桩结构施工因素的竖向弹性地基梁法。本文土锚钢板桩结构的平面应变有限元分析是在原有基本程序基础上，通过添加相关功能模块、修正缺陷后完成的。在土锚钢板桩结构的平面应变有限元分析中，接触面单元、杆单元与梁单元的联结处存在自由度协调的问题，本文通过扩充单元劲度矩阵的方法，成功解决了这一问题，处理后的接触面单元兼起Goodman接触面单元与过渡单元的双重作用。本文应用非线性有限元分析程序，模拟了淮安三线船闸的施工过程，计算分析了各特征施工步下的位移、内力与墙后土压力的分布及土锚与支撑的轴力变化情况，并分析了钢板桩变形与内力的部分影响因素。土锚是土锚钢板桩结构中的一个关键部分，本文模拟了土锚与土接触面上的荷载传递规律，建立了压力分散型土锚的轴对称有限元分析模型，对其设计计算方法作了初步的研究，并与淮安三线船闸的部分实测资料进行了对比计算分析。本文对土锚钢板桩结构计算分析的研究，可为土锚、钢板桩及土锚钢板桩类似结构的设计与分析研究提供借鉴与参考。更多还原

【Abstract】 Prestressed soil anchors can effectively control horizontal displacements of steel sheet piles, and improve their bearing force property. Dispersively compressed soil anchored steel sheet piles were applied to the third-line Huai’an ship lock for permanent structures for the first time in China. Dispersively compressed soil anchored steel sheet piles are novel in structure shape, and feasible in mechanism of bearing force. Especially as compared with traditional soil anchors’, bearing and transferring force mechanism of dispersively compressed soil anchores are more reasonable, and their bond stress distribution is more uniform, moreover, their anticorrosive performance and durability improve greatly.This paper simply reviews the various applications of soil anchors, steel sheet piles and soil-anchored steel sheet piles in construction projects, and discusses the analysis methods of soil-anchored steel sheet pile structures. The practicability of method of vertical beam on elastic foundation is relatively excellent in engineering design; the method considering construction factors is realized in software of ANSYS in this paper. The plane strain finite element analysis of soil-anchored steel sheet piles is based on calculating program, and completed by adding relevant function module and modifying defects. This paper solves the coordination problem of degree of freedom in the combination of beam element and interface element or link element successively by the method of expanding element stiffness matrix, and interface elements acted as both Goodman interface element and transition element. This paper applies nonlinear finite element program to simulate the construction process of the third-line Huai’an ship lock; calculates and analyzes the displacements and internal forces of each construction step, distribution of soil compression and the varied situation of axial force of anchors and supports; moreover, analyzes partial affection factors of deformation and internal force of steel sheet piles. Because anchors are key parts of soil-anchored steel sheet pile structures. This paper summarizes the transferring force rule of interface between anchor and soil, establishes axial symmetry model of finite element analysis of dispersively compressed soil anchors, and makes some initial research on design and calculation method of soil anchors, further more. This paper contrasts results of calculation and analysis with some on-the-spot surveyed data of the third-line Huai’an ship lock. The achievements of analysis and calculation to soil-anchored steel sheet piles can provide reference for the analysis research and design of soil anchors, steel sheet piles and soil-anchored steel sheet pile structures, and so on.更多还原