芜湖地下商业街盖挖逆作法和盖挖顺作法评价研究

发布时间：2018-03-28 21:28

本文选题：盖挖逆作法　切入点：盖挖顺作法　出处：《哈尔滨工业大学》2014年硕士论文

【摘要】：城市化进程的推进和土地资源的日益稀缺之间的巨大反差促使人们不断开发城市地下空间，地铁车站和地下商业街等地下结构如雨后春笋般出现。虽然城市地下空间的开发和利用有利于缓解城市的土地资源紧缺现象，但是地下结构的施工必然伴随着各种问题的出现。为了控制地下工程施工对周围环境造成的不利影响，，势必要提高对地下工程施工技术的要求，因此，在地下结构施工时选用合理的施工方法就显得尤为重要。对于不同施工方法的优劣的判断不能仅局限于过往的经验，而应该对不同施工方法的施工难度、施工成本、工期控制、对周围环境的影响和结构自身受力情况等多个方面综合考虑，同时应该针对具体工程具体对待，不能以一概全。本文依托于芜湖市中山路畅通工程地下商业街项目，采用有限元软件MIDAS/GTS对该工程采用盖挖逆作法和盖挖顺作法的施工过程进行模拟分析。通过分析两种施工方法在施工过程中对周围环境和地下结构自身的影响规律，比较两种施工方法的优劣，为之后的类似工程提供借鉴。本文的主要研究内容如下：首先，介绍了相关有限元软件和近接施工工程概况，在此基础上针对数值模型的基本假设、模型尺寸及边界确定、单元属性定义和施工工况划分做了介绍；其次，分析了两种不同施工方法下的基坑外侧地表位移、邻近建筑物基础和框架柱位移、支护桩水平位移、地下结构顶板和底板竖向位移的变化规律。结果表明：土体的开挖卸荷是导致地表、周围建筑以及地下结构自身位移发生较大变化的主要原因。逆作法施工下地下结构顶板和底板施工可以减缓土体开挖卸荷对周围环境的影响，而顺作法施工支护体系缺乏有效的横向支撑，位移变化更为明显。最后，在控制上述各项位移方面，盖挖逆作法相较于盖挖顺作法具备较大的优势，但是二者的各项变形指标均在规范要求之内。通过以上分析可知，地下结构的不同施工方法各有特点，在实际工程应该根据不同工程的特点选择合适的施工方法，保证地下结构施工的安全可行。
[Abstract]:The huge contrast between the advancement of urbanization and the increasing scarcity of land resources has prompted people to continuously develop urban underground space. Underground structures such as subway stations and underground commercial streets have sprung up. Although the development and utilization of urban underground space is conducive to alleviating the shortage of urban land resources, However, the construction of underground structures is bound to accompany with the emergence of various problems. In order to control the adverse effects of underground construction on the surrounding environment, it is necessary to raise the requirements for the construction technology of underground engineering. It is very important to select reasonable construction methods in the construction of underground structure. The judgement of the merits and demerits of different construction methods should not be limited to the past experience, but should be controlled to the difficulty, cost and duration of construction of different construction methods. Comprehensive consideration should be given to the influence of the surrounding environment and the stress on the structure itself, and the concrete treatment should be taken into account in the light of the concrete project, and not all of them should be taken into account. This article relies on the underground commercial street project of Zhongshan Road unblocked project in Wuhu City, Finite element software MIDAS/GTS is used to simulate and analyze the construction process of the project using the reverse method of capping excavation and the method of leveling the cover excavation. By analyzing the influence of the two construction methods on the surrounding environment and the underground structure itself during the construction process, this paper analyzes the effect of the two construction methods on the surrounding environment and the underground structure itself. The advantages and disadvantages of the two construction methods are compared to provide a reference for similar projects. The main contents of this paper are as follows:. First of all, the paper introduces the relevant finite element software and the general situation of the construction project, and then introduces the basic assumptions of the numerical model, the determination of the model size and boundary, the definition of the element attributes and the division of the construction conditions. The lateral surface displacement of foundation pit, the displacement of adjacent building foundation and frame column, and the horizontal displacement of supporting pile under two different construction methods are analyzed. The change of vertical displacement of the roof and floor of underground structure. The results show that the excavation and unloading of soil is the cause of the surface, The main reasons for the large changes in the displacement of surrounding buildings and underground structures are that the construction of roof and floor of underground structures under reverse construction can slow down the influence of excavation and unloading of soil on the surrounding environment. However, the construction support system is short of effective lateral support, and the displacement change is more obvious. Finally, in the control of the above displacement, the reverse method of cover excavation has more advantages than the method of cover excavation. However, both of the deformation indicators are within the requirements of the specification. According to the above analysis, the different construction methods of underground structure have their own characteristics, and the suitable construction methods should be selected according to the characteristics of different projects in order to ensure the safety and feasibility of underground structure 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】：TU94

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