盖挖法施工减少水平支护结构位移的方法研究

发布时间：2018-03-01 04:39

本文关键词： 挡土墙体系逆作法施工水平位移　出处：《哈尔滨工业大学》2014年硕士论文　论文类型：学位论文

【摘要】：由于城市中的人口不断增加，公共设施用地较为紧缺。为了最大限度地利用现有的土地，开始建设地下结构来作为公共设施。在地下开挖时会出现过大的变形，减小位移可采用的方法有很多，，例如观测、喷射注浆、安装支柱等。但这些方法都不是从结构设计角度，使桩水平变形和竖向位移最小作为限值。本文的主要研究目的就是开发一种新的设计方法，从而能够使逆作法中支护墙体系的桩水平和竖向位移最小。首先建立了挡土墙体系的模型，它是由H型钢桩、混凝土桩、结构连接件、弹性支承及地基土组成的。筏板和桩之间的结构连接件是以连接铰的形式表示的，地基土则以弹簧的形式表示，从而得到了三个数值模型，分别有连接铰、没有连接铰和有弹性支撑。这些模型都是采用有限元软件ANSYS来进行模拟和分析的。本文对有结构连接件、没有结构连接件及有弹性支承的挡土墙体系的特性进行了研究。通过对这三种模型的模拟和分析，得到了桩的最大水平位移、垂直地面沉降、弯矩、剪力及轴力的结果。这些结果通过图和表的形式表现出来，之后对其进行分析和讨论。最后，得出结论：相比于其他两种模型，不带铰的模型是用于设计挡土墙体系的最好模型，因为这种模型能够使逆作法施工中挡土墙体系的水平位移最小。
[Abstract]:Because of the increasing population in the city, the land for public facilities is in short supply. In order to make the best use of the existing land, we begin to build underground structures as public facilities. There are a number of methods for reducing displacement, such as observation, jet grouting, installation of pillars, etc., but none of these methods are designed from a structural point of view, The main purpose of this paper is to develop a new design method to minimize the horizontal and vertical displacement of the supporting wall system. Firstly, the model of retaining wall system is established, which is composed of H-shaped steel pile, concrete pile, structural connectors, elastic supports and foundation soil. The structural connectors between raft and pile are expressed in the form of joint hinges. The foundation soil is expressed in the form of spring, and three numerical models are obtained, which are connected hinge, no joint hinge and elastic support. These models are simulated and analyzed by finite element software ANSYS. In this paper, the characteristics of retaining wall system with structural connectors, no structural connectors and elastic supports are studied. Through the simulation and analysis of these three models, the maximum horizontal displacement, vertical ground subsidence, bending moment of the pile are obtained. The results of shear force and axial force. These results are expressed in the form of graphs and tables, and then analyzed and discussed. Finally, it is concluded that compared with the other two models, the unhinged model is the best model for the design of retaining wall system, because this model can minimize the horizontal displacement of the retaining wall system in reverse construction.
【学位授予单位】：哈尔滨工业大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TU476.4;TU753

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