井筒式地下连续墙桥梁基础的静力承载性能研究和动力响应分析
发布时间：2019-01-17 09:33
【摘要】：井筒式地下连续墙基础具有承载能力强、抗横向荷载能力强、施工方便等诸多优点,作为一种新型的桥梁基础形式,随着各项试验和模拟研究的开展,其相对于其他基础形式的优势及良好的经济效益也日渐显现。本文利用数值模拟的方法对井筒式地下连续墙桥梁基础静力荷载下的承载性状以及地震荷载下抵抗地基液化的能力进行了探究。主要内容和结论如下： (1)论述了地下连续墙的发展、分类和其在桥梁基础中的应用状况,并总结了关于地基液化的研究历程。 (2)利用FLAC3D软件对井筒式地连墙基础进行了静力承载性能分析,并着重对其纵向荷载下承载性状进行了研究。 (3)探究了土体物理力学性质：粘聚力、内摩擦角、剪切模量、密度和体积模量等对井筒地连墙基础的承载性能的影响程度。结果表明：土质越好,墙体的承载力越大,而墙体增大到一定尺寸(墙深达26m或墙宽达7m)后,继续增大尺寸并不能增强其承载能力。 (4)首次用FLAC3D对井筒式地下连续墙基础在地震荷载作用下的动力响应进行了模拟分析。得出结论,井筒式地下连续墙基础对土芯土有一定的保护作用,能够阻断砂土的液化趋势；基础墙体的横向刚度,能够满足抵抗地震横向作用的要求。
[Abstract]:As a new type of bridge foundation, the underground continuous wall foundation of wellbore type has many advantages, such as strong bearing capacity, strong lateral load resistance, easy construction and so on. Its relative to other basic forms of advantage and good economic benefits are also increasingly apparent. In this paper, the bearing behavior of underground diaphragm wall bridge foundation under static load and the ability to resist foundation liquefaction under seismic load are investigated by numerical simulation. The main contents and conclusions are as follows: (1) the development, classification and application of underground continuous wall in bridge foundation are discussed, and the research history of foundation liquefaction is summarized. (2) using FLAC3D software, the static load-bearing behavior of shaft wall foundation is analyzed, and the load-bearing behavior under longitudinal load is studied emphatically. (3) the physical and mechanical properties of soil, such as cohesive force, angle of internal friction, shear modulus, density and volume modulus, are studied. The results show that the better the soil quality, the greater the bearing capacity of the wall, and when the wall increases to a certain size (the depth of the wall reaches 26m or the width of the wall reaches 7m), the bearing capacity of the wall can not be enhanced by increasing its size. (4) for the first time, FLAC3D is used to simulate the dynamic response of underground diaphragm wall foundation under seismic load. It is concluded that the foundation of borehole diaphragm wall can protect the soil core and soil to some extent, and can block the liquefaction trend of sand, and the lateral stiffness of the foundation wall can meet the requirement of resisting the lateral action of earthquake.
【学位授予单位】：山东建筑大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U445.55
本文编号：2409906
[Abstract]:As a new type of bridge foundation, the underground continuous wall foundation of wellbore type has many advantages, such as strong bearing capacity, strong lateral load resistance, easy construction and so on. Its relative to other basic forms of advantage and good economic benefits are also increasingly apparent. In this paper, the bearing behavior of underground diaphragm wall bridge foundation under static load and the ability to resist foundation liquefaction under seismic load are investigated by numerical simulation. The main contents and conclusions are as follows: (1) the development, classification and application of underground continuous wall in bridge foundation are discussed, and the research history of foundation liquefaction is summarized. (2) using FLAC3D software, the static load-bearing behavior of shaft wall foundation is analyzed, and the load-bearing behavior under longitudinal load is studied emphatically. (3) the physical and mechanical properties of soil, such as cohesive force, angle of internal friction, shear modulus, density and volume modulus, are studied. The results show that the better the soil quality, the greater the bearing capacity of the wall, and when the wall increases to a certain size (the depth of the wall reaches 26m or the width of the wall reaches 7m), the bearing capacity of the wall can not be enhanced by increasing its size. (4) for the first time, FLAC3D is used to simulate the dynamic response of underground diaphragm wall foundation under seismic load. It is concluded that the foundation of borehole diaphragm wall can protect the soil core and soil to some extent, and can block the liquefaction trend of sand, and the lateral stiffness of the foundation wall can meet the requirement of resisting the lateral action of earthquake.
【学位授予单位】：山东建筑大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U445.55
【参考文献】
相关期刊论文 前7条
1 陈晓东;柴建峰;;黄土地区水平荷载作用下闭合型地下连续墙基础承载性状分析[J];工程地质学报;2008年03期
2 徐国平,刘明虎,刘化图;阳逻长江大桥南锚碇圆形地下连续墙设计[J];公路;2004年10期
3 刘明虎;付宇文;;井筒式地下连续墙基础设计及应用[J];公路;2006年05期
4 张少锦;孟凡超;;珠江黄埔大桥悬索桥锚碇设计与施工技术创新[J];公路;2008年08期
5 许黎明;一种新的桥梁基础型式——地下连续墙基础[J];国外桥梁;1995年03期
6 吴九江;程谦恭;文华;;地下连续墙基础在日本的多样化发展[J];工业建筑;2013年01期
7 张建民,王刚;考虑地基液化后大变形的桩-土动力相互作用分析[J];清华大学学报(自然科学版);2004年03期
相关博士学位论文 前1条
1 侯永茂;软土地层中格形地下连续墙围护结构性状研究[D];上海交通大学;2010年
，本文编号：2409906
本文链接：https://www.wllwen.com/kejilunwen/jiaotonggongchenglunwen/2409906.html
