预应力锚索复合土钉墙相关影响因素分析

发布时间：2018-02-02 02:25

本文关键词： 基坑支护复合土钉墙预应力锚索土压力数值模拟　出处：《东华理工大学》2014年硕士论文　论文类型：学位论文

【摘要】：在科学技术日益发展的今天,随着各种高层建筑的地下室和地铁的建设,深基坑支护工程也将会越来越多,就目前而言,深基坑的支护形式很多,按照其结构受力的情况特点可以分为桩墙联合支护结构,土钉墙结构,重力式挡墙结构,拱墙结构等几种类型,在实际工程中,土钉墙支护结构应用最广,但却存在很多问题,例如在一些变形控制比较严格的场地中变形超过允许值,因此,土钉墙支护结构往往和灌注桩、微型桩、预应力锚杆(锚索)等一些结构联合使用,然而目前的设计计算理论却并不完善、对一些重要性的问题例如现有的土压力计算理论和实际情况的比较,支护结构的内力变化等问题并没有很好的阐述,本文主要就以预应力锚索型复合土钉墙和传统土钉墙的实际工程应用效果作出定量分析,并结合实际工程,进行数值模拟计算,对支护效果进行相应的评价。本文的主要内容有:首先讨论土钉墙的支护形式,发展概况和应用情况以及目前的国内外土钉支护结构的发展情况和研究情况,并提出土钉支护中所存在的一些问题,如实际施工过程中土压力的分布情况,现有的土压力计算理论是否符合实际情况,并对各种土压力计算方法进行比较分析,确定一种比较适用的计算理论。其次,在上文讨论的基础上分别对传统土钉墙以及预应力锚索型复合土钉墙的设计方法以及工作机理进行介绍,并对影响复合土钉墙稳定性的因素进行分析,提出相应的计算方法。然后,根据实际工程情况,对预应力锚索复合土钉墙的应用效果从如下几个方面进行评价、如土钉应力的变化,在预应力锚索作用下土钉应力的变化,复合土钉墙的水平和垂直位移的变化情况,并对实际土压力、新土压力公式、传统计算公式的结果进行对比、并结合数值模拟的结果来综合反映预应力锚索复合土钉墙在基坑工程中应用效果。最后对全文进行总结,提出研究成果,提出不足之处并对复合土钉墙技术提出展望。
[Abstract]:With the development of science and technology, with the construction of basement and subway of various high-rise buildings, the support works of deep foundation pit will be more and more. At present, there are a lot of support forms of deep foundation pit. According to the characteristics of the structure, it can be divided into pile wall combined support structure, soil nail wall structure, gravity retaining wall structure, arch wall structure and other types. In actual engineering, soil nail wall support structure is the most widely used. However, there are many problems, for example, in some places where deformation control is more strict than the allowable value, therefore, the soil nailing wall support structure and cast-in-place pile, micro-pile. Some structures such as prestressed anchors (anchor cables) are used together, however, the current design and calculation theory is not perfect, and some important problems such as the existing theory of earth pressure calculation and the actual situation are compared. The change of internal force of supporting structure is not well elaborated. This paper mainly makes quantitative analysis on the actual engineering application effect of prestressed anchor cable composite soil nailing wall and traditional soil nailing wall, and combines with actual engineering. The main contents of this paper are as follows: firstly, the support form of soil nailing wall is discussed. The development and application of soil nailing support structure at home and abroad are reviewed. Some problems existing in soil nailing support are put forward, such as the distribution of earth pressure in actual construction process. The existing earth pressure calculation theory is in line with the actual situation, and a variety of earth pressure calculation methods are compared and analyzed to determine a more suitable calculation theory. Secondly. Based on the discussion above, the design method and working mechanism of traditional soil nailing wall and prestressed anchor cable composite soil nailing wall are introduced, and the factors influencing the stability of composite soil nailing wall are analyzed. Then, according to the actual engineering situation, the application effect of prestressed anchor cable composite soil nailing wall is evaluated from the following aspects, such as the change of soil nailing stress. Under the action of prestressed anchor cable, the change of soil nailing stress and the change of horizontal and vertical displacement of composite soil nailing wall are compared, and the results of actual earth pressure, new earth pressure formula and traditional calculation formula are compared. Combined with the results of numerical simulation to reflect the application effect of prestressed anchor cable composite soil nailing wall in foundation pit engineering. Finally the full text is summarized and the research results are put forward. The inadequacies and the prospect of composite soil nailing wall technology are put forward.
【学位授予单位】：东华理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TU476

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