T型地下连续墙槽壁稳定性及变形研究
发布时间：2019-02-17 12:29
【摘要】：随着深基坑及现代海运业的发展，特别是基坑深度的增大及码头载货量的增大和装卸能力的提高，对承载力要求越来越高，将T型地下连续墙应用于深基坑工程及大型码头的工程实例越来越多。而且同等截面面积的T型地下连续墙与圆桩、方桩相比，截面抗弯模量大，具有承受更大的竖向荷载与水平荷载，减小沉降以及墙体的水平位移等特点。但在以往的研究中主要针对矩形槽孔的研究，而T型超深连续墙的开挖稳定性的规律性，在国内外研究的比较少，所以对T型地下连续墙槽壁的稳定性研究具有重要意义。对槽壁稳定有着决定性影响的因素进行控制，并对失稳机理进行分析，有助于提高对槽壁稳定的认识，，从而能更好地防止失稳的发生，并能为相类似的工程提供有效的借鉴。 本文通过有限元分析揭示了T型地下连续墙槽壁的失稳机理、其潜在滑动面的位置及失稳破坏模式。首先对不同T型尺寸的地下连续墙进行对比分析，得出槽壁稳定性及变形的变化趋势，得出失稳模式从翼缘边处失稳向阳角处失稳的两方向尺寸比值的临界点。然后分析了在成槽开挖过程中，槽壁的稳定性及变形受开挖深度的影响规律。最后分析泥浆重度、土层参数、施工荷载、含有软弱层以及搅拌桩加固对槽壁稳定及变形的影响及其规律，为T型地连墙施工提供借鉴。
[Abstract]:With the development of deep foundation pit and modern shipping industry, especially the increase of foundation pit depth, the increase of wharf loading capacity and the improvement of loading and unloading capacity, the demand for bearing capacity is becoming higher and higher. There are more and more examples of T-type underground diaphragm wall used in deep foundation pit engineering and large wharf engineering. Compared with circular pile, T-shaped diaphragm wall with the same cross-sectional area has higher flexural modulus and higher vertical and horizontal load, reducing settlement and horizontal displacement of wall, etc. However, in the previous research, the research of rectangular slot hole is mainly focused on, but the regularity of excavation stability of T-type ultra-deep continuous wall is less studied at home and abroad, so it is of great significance to study the stability of T-type underground continuous wall groove wall. Controlling the factors that have decisive influence on the stability of the groove wall and analyzing the mechanism of the instability will help to improve the understanding of the stability of the groove wall and thus prevent the occurrence of the instability better and provide effective reference for similar projects. In this paper, the mechanism of instability, the location of potential sliding surface and the failure mode of T-shaped diaphragm wall are revealed by finite element analysis. In this paper, the stability and deformation trend of grooving wall are obtained by comparing and analyzing the underground continuous wall with different T shape sizes, and the critical point of the ratio of the two dimensions of instability mode from flange edge to positive angle is obtained. The stability and deformation of the groove wall are influenced by the depth of excavation in the process of trench excavation. At last, the influence and law of mud thickness, soil parameters, construction load, soft layer and mixing pile on the stability and deformation of groove wall are analyzed, which can be used for reference in the construction of T-type ground connecting wall.
【学位授予单位】：华南理工大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TU476.3
本文编号：2425166
[Abstract]:With the development of deep foundation pit and modern shipping industry, especially the increase of foundation pit depth, the increase of wharf loading capacity and the improvement of loading and unloading capacity, the demand for bearing capacity is becoming higher and higher. There are more and more examples of T-type underground diaphragm wall used in deep foundation pit engineering and large wharf engineering. Compared with circular pile, T-shaped diaphragm wall with the same cross-sectional area has higher flexural modulus and higher vertical and horizontal load, reducing settlement and horizontal displacement of wall, etc. However, in the previous research, the research of rectangular slot hole is mainly focused on, but the regularity of excavation stability of T-type ultra-deep continuous wall is less studied at home and abroad, so it is of great significance to study the stability of T-type underground continuous wall groove wall. Controlling the factors that have decisive influence on the stability of the groove wall and analyzing the mechanism of the instability will help to improve the understanding of the stability of the groove wall and thus prevent the occurrence of the instability better and provide effective reference for similar projects. In this paper, the mechanism of instability, the location of potential sliding surface and the failure mode of T-shaped diaphragm wall are revealed by finite element analysis. In this paper, the stability and deformation trend of grooving wall are obtained by comparing and analyzing the underground continuous wall with different T shape sizes, and the critical point of the ratio of the two dimensions of instability mode from flange edge to positive angle is obtained. The stability and deformation of the groove wall are influenced by the depth of excavation in the process of trench excavation. At last, the influence and law of mud thickness, soil parameters, construction load, soft layer and mixing pile on the stability and deformation of groove wall are analyzed, which can be used for reference in the construction of T-type ground connecting wall.
【学位授予单位】：华南理工大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TU476.3
【参考文献】
相关期刊论文 前10条
1 李小青,何圣熙;地下连续墙槽壁稳定性分析[J];地球科学;1999年02期
2 丁秀美,黄润秋,刘光士;FLAC-3D前处理程序开发及其工程应用[J];地质灾害与环境保护;2004年02期
3 季冲平,余绍锋;地下连续墙泥浆槽稳定性分析的一种方法[J];华东交通大学学报;1998年03期
4 王树仁;张海清;;MIDAS/GTS-FLAC~(3D)耦合建模新方法及其应用[J];土木建筑与环境工程;2010年01期
5 黄泽恩;地下连续墙泥浆槽的稳定性分析[J];建筑结构学报;1986年01期
6 张拴牢;;影响地下连续墙槽壁稳定性的外部因素分析[J];科技情报开发与经济;2011年04期
7 王盼;莫海鸿;曾子明;;T形地下连续墙阳角处槽壁稳定性分析[J];路基工程;2010年04期
8 杨嵘昌;地下墙护壁泥浆临界相对密度的显式解──坍体底面未及地下水面[J];南京建筑工程学院学报;1995年01期
9 杨嵘昌,刘世同;地下墙浅表泥浆槽壁的稳定分析——坍体底面涉及地表时的泥浆临界相对密度[J];南京建筑工程学院学报;1997年02期
10 杨嵘昌;导墙对地下墙泥浆槽壁的稳定作用分析[J];南京建筑工程学院学报;1998年02期
本文编号：2425166
本文链接：https://www.wllwen.com/kejilunwen/sgjslw/2425166.html
