杭州某地铁深基坑支护设计与数值模拟
发布时间：2018-10-16 15:32
【摘要】：近年来我国各城市的地铁建设如火如荼,伴随而来的深基坑工程的安全性研究就显得尤为重要,如今数值模拟等软件的应用对地铁建设起到了直接的指导作用。本文简要的概括了基坑工程的发展现状,并且总结了基坑工程的几种主要支护类型,通过对比介绍了各个类型的优缺点,为下面的支护形式的选取做了准备。另外简单说明了深基坑设计的一些计算理论和优选理论,以及基坑设计的一般的原则。接着结合杭州城站站工程实际,介绍了工程的水文、地质条件,通过多目标决策模糊理论,选择最为合适的支护形式,再利用软件设计支护结构并进行有限元验算。对选取的工程实例的基坑支护结构形式作出了优选并对支护的细部构造进行了研究。根据施工的现场情况与设计结果将其分为若干工况,运用大型有限元软件Plaxis建立模型,模拟基坑开挖过程并进行计算,将计算结果进行比较,对支护结构周围土体的沉降情况进行研究,验证了优选得出的基坑支护形式的安全性。本文中根据最终的数值模拟的结果,将设计值、模拟值以及监测值进行对比,由此可得出以下几点成果:(1)根据杭州地铁城站站的工程概况以及所处地区的工程地质,利用启明星基坑分析计算软件对该地铁深基坑进行支护结构设计,并对其进行验算。根据设计的结果,进行施工建造,并在施工期间严格按照标准进行监测,对比监测的结果发现设计值能满足基坑的变形要求,说明支护结构的设计是合理可行的;(2)根据杭州城站站地铁深基坑支护工程为例,采用PLAXIS 3D建模来对该深基坑的开挖过程进行模拟分析,得到该深基坑的位移、沉降、轴力的分布及变化规律;(3)将数值模拟的值与实际监测得出的数值进行对比,发现结果基本一致,证明了该基坑项目方案设计的合理性数值模拟的正确性;PLAXIS 2D/3D程序现在已广泛应用于各种复杂岩土工程项目的有限元分析中,同时数值模拟这种方法具有方便直观、概念清晰、可操作性强而且不需耗费大量资金等优点,在现在已经成为一种主流趋势,将来也必将得到更多的发展应用,本文依托这一方式得到的结果也为同类型的深基坑开挖提供了一定的参考价值。
[Abstract]:In recent years, the construction of subway in various cities in China is very important, and the research on the safety of deep foundation pit engineering is especially important, and the application of software such as numerical simulation has played a direct role in the construction of subway. In this paper, the present situation of foundation pit engineering is summarized, and several main types of support are summarized, and the advantages and disadvantages of each type are introduced. In addition, some calculation theory and optimization theory of deep foundation pit design, as well as general principles of foundation pit design are briefly described. Combined with Hangzhou city station engineering practice, the hydrology and geological conditions of the project are introduced, the fuzzy theory of multi-objective decision-making is adopted, the most suitable supporting form is selected, and the software design support structure is utilized and the finite element calculation is carried out. The structural form of the foundation pit support for the selected project example is optimized and the detailed structure of the support is studied. According to the site situation and the design result of the construction, it is divided into several working conditions, the model is established by using the large-scale finite element software Plaxis, the excavation process of the foundation pit is simulated and the calculation is carried out, the calculation result is compared, the settlement condition of the surrounding soil surrounding the supporting structure is studied, the security of the preferred form of foundation pit support is verified. In this paper, according to the result of the final numerical simulation, the design value, the simulation value and the monitoring value are compared, and the following results can be obtained: (1) According to the engineering situation of Hangzhou Metro Station Station and the engineering geology in the area, The foundation pit analysis and calculation software is used to design the supporting structure of the deep foundation pit of the subway, and the checking calculation is carried out. According to the result of the design, the construction is carried out and monitored strictly according to the standard during the construction period. The result of the comparison monitoring finds that the design value can meet the deformation requirements of the foundation pit, and the design of the supporting structure is reasonable and feasible. (2) According to the support engineering of subway deep foundation pit in Hangzhou City Station Station, the excavation process of the deep foundation pit is simulated and analyzed by means of PLAXIS 3D modeling, and the distribution and variation law of the displacement, settlement and shaft force of the deep foundation pit are obtained. (3) comparing the value of the numerical simulation with the numerical value obtained by the actual monitoring, finding the correctness of the rationality numerical simulation of the project design of the foundation pit; and the PLAXIS 2D/ 3D program is now widely applied to the finite element analysis of various complex geotechnical engineering projects, meanwhile, the numerical simulation method has the advantages of convenience and intuition, clear concept, strong operability and no need to consume a large amount of funds and the like, The results obtained in this paper also provide some reference value for the excavation of the same type of deep foundation pit.
【学位授予单位】：安徽理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU753
[Abstract]:In recent years, the construction of subway in various cities in China is very important, and the research on the safety of deep foundation pit engineering is especially important, and the application of software such as numerical simulation has played a direct role in the construction of subway. In this paper, the present situation of foundation pit engineering is summarized, and several main types of support are summarized, and the advantages and disadvantages of each type are introduced. In addition, some calculation theory and optimization theory of deep foundation pit design, as well as general principles of foundation pit design are briefly described. Combined with Hangzhou city station engineering practice, the hydrology and geological conditions of the project are introduced, the fuzzy theory of multi-objective decision-making is adopted, the most suitable supporting form is selected, and the software design support structure is utilized and the finite element calculation is carried out. The structural form of the foundation pit support for the selected project example is optimized and the detailed structure of the support is studied. According to the site situation and the design result of the construction, it is divided into several working conditions, the model is established by using the large-scale finite element software Plaxis, the excavation process of the foundation pit is simulated and the calculation is carried out, the calculation result is compared, the settlement condition of the surrounding soil surrounding the supporting structure is studied, the security of the preferred form of foundation pit support is verified. In this paper, according to the result of the final numerical simulation, the design value, the simulation value and the monitoring value are compared, and the following results can be obtained: (1) According to the engineering situation of Hangzhou Metro Station Station and the engineering geology in the area, The foundation pit analysis and calculation software is used to design the supporting structure of the deep foundation pit of the subway, and the checking calculation is carried out. According to the result of the design, the construction is carried out and monitored strictly according to the standard during the construction period. The result of the comparison monitoring finds that the design value can meet the deformation requirements of the foundation pit, and the design of the supporting structure is reasonable and feasible. (2) According to the support engineering of subway deep foundation pit in Hangzhou City Station Station, the excavation process of the deep foundation pit is simulated and analyzed by means of PLAXIS 3D modeling, and the distribution and variation law of the displacement, settlement and shaft force of the deep foundation pit are obtained. (3) comparing the value of the numerical simulation with the numerical value obtained by the actual monitoring, finding the correctness of the rationality numerical simulation of the project design of the foundation pit; and the PLAXIS 2D/ 3D program is now widely applied to the finite element analysis of various complex geotechnical engineering projects, meanwhile, the numerical simulation method has the advantages of convenience and intuition, clear concept, strong operability and no need to consume a large amount of funds and the like, The results obtained in this paper also provide some reference value for the excavation of the same type of deep foundation pit.
【学位授予单位】：安徽理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU753
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