北京市某工程深基坑支护研究

发布时间：2019-02-12 23:04

【摘要】：近些年来尤其是改革开放后，我国的经济、文化水平有了显著的提高，城镇人口密度的增加，高层建筑结构迅速增多以及人们对地下空间的迫切需求。以致深基坑工程数量不断增加，其设计和施工难度也显著提高，既要保证工程质量，，又要尽可能降低深基坑支护的费用，已经成为每一个深基坑支护设计者需要解决的一个重要问题。随着城市的不断建设，基坑建设条件越来越复杂（地域限制，水暖，电力，通信管道及市政道路影响），以及周边已有建筑的影响，考虑到上述因素，北京地区深基坑多采用桩锚支护，然而目前国内对桩锚联合支护的研究还不太成熟，对这种基坑支护的作用机理和配合度的控制研究仍处于起步阶段，因此进行其理论研究对促进工程实践应用具有重要意义。鉴于此，本文主要研究的超深基坑中一种常见的支护结构——桩锚支护结构。文章主要结合北京市某超深基坑工程中的一个典型桩锚支护区域进行展开的，论文完成的主要工作： (1)我国基坑支护发展现状及常见支护结构类型分析及选取。 (2)系统地总结常用的深基坑设计理论及计算方法。 (3)以北京某住宅楼基坑工程为背景，利用理正分析软件及相应的计算公式计算出了工程实例的桩锚支护结构桩体位移、土压力、剪力等等，根据计算结果进行了相应的总结分析。 (4)结合工程实践应用Midas GTS对设计方案进行数值模拟分析，对比理正计算结果分析两者差异性。通过对实际工程的计算与研究得出结论：与理正计算和实际监测的结果相比，验证了Midas GTS数值模拟的正确性与实用性。
[Abstract]:In recent years, especially after the reform and opening up, the economic and cultural level of our country has been remarkably improved, the density of urban population has increased, the structure of high-rise buildings has increased rapidly, and the urgent need for underground space has been raised. As a result, the number of deep foundation pit projects is increasing, and the design and construction difficulties are also significantly increased. It is necessary to ensure the quality of the project and to reduce the cost of deep foundation pit support as much as possible. It has become an important problem for every deep foundation pit support designer to solve. With the continuous construction of the city, the conditions of foundation pit construction are becoming more and more complex (geographical restrictions, plumbing, electric power, communication pipelines and municipal roads), and the influence of existing buildings in the surrounding area, taking into account the above factors, Pile-anchor support is often used in deep foundation pit in Beijing area. However, the research on pile-anchor combined support in China is still immature, and the research on the mechanism and coordination control of this kind of foundation pit support is still in its infancy. Therefore, it is of great significance to carry out theoretical research to promote the application of engineering practice. In view of this, this article mainly studies one kind of common support structure in the ultra deep foundation pit-pile anchor support structure. This paper mainly combines a typical pile-anchor support area in a super deep foundation pit project in Beijing. The main work accomplished in this paper is as follows: (1) the current situation of foundation pit support in China and the analysis and selection of common supporting structure types. (2) summarize the design theory and calculation method of deep foundation pit systematically. (3) taking the foundation pit engineering of a residential building in Beijing as the background, the pile displacement, earth pressure, shear force and so on of pile-anchor supporting structure are calculated by using the software of rational analysis and the corresponding calculation formula. According to the calculated results, the corresponding summary and analysis are carried out. (4) combined with engineering practice, Midas GTS is used to simulate and analyze the design scheme, and the difference between them is analyzed by comparing the results of positive calculation. Through the calculation and research of the actual engineering, it is concluded that the correctness and practicability of the Midas GTS numerical simulation are verified compared with the results of the rational and positive calculation and the actual monitoring.
【学位授予单位】：河北工程大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TU753

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