深基坑桩撑支护结构变形模拟分析

发布时间：2018-03-07 08:01

  本文选题：基坑支护结构　切入点：桩体水平位移　出处：《中国地质大学(北京)》2017年硕士论文　论文类型：学位论文

【摘要】：现如今,中国经济发展得越来越快,超高层的建筑不断增多,因此,基坑面积和开挖深度也相应地产生了巨大的变化。基坑工程是指在地下施工过程中,采用基坑支护、降低水位以及开挖土方等一系列措施,以确保主体结构安全有效地施工且不对周围环境产生破坏的一项综合性工程。深基坑工程的特点以深、大、复杂为主。在基坑开挖前,需要先对基坑采取支护措施,伴随着基坑的开挖,支护结构即开始受力并引发变形。其结构变形会造成很多破坏,如地表沉降、结构失稳破裂,对周边建筑环境产生非常严重的影响。本文依托于上海某地区的基坑支护工程,对排桩+内支撑支护结构变形系统进行了深入研究。主要工作及研究内容如下:首先,总结了基坑主要支护体系及其使用范围,并基于深基坑桩体变形机理,进行了变形理论分析;其次,依托上海某基地项目,以工程中已有的资料作为参考,并借助于Midas GTS工程模拟软件建立了深基坑排桩+内支撑支护结构的模型,对分步开挖的过程进行了模拟,根据应变云图,分析了支护桩体变形和内支撑轴力的变化规律;然后,结合实际现场所获得的监测数据,将监测数据与模拟数据进行了对比分析,验证了参数选取和模型建立的关键技术要点;最后,在所建的模型的基础上,利用数值模拟方法研究了桩体入土深度、桩间距、桩径、地面超载和支撑间距等参数对支护桩体变形的影响规律。
[Abstract]:Nowadays, the economy of China is developing more and more rapidly, and the number of super high-rise buildings is increasing. Therefore, the area and depth of foundation pit have changed greatly accordingly. The foundation pit engineering refers to the use of foundation pit support in the process of underground construction. A series of measures such as lowering water level and excavation of earth to ensure that the main structure is safely and effectively constructed and does not cause damage to the surrounding environment. The characteristics of deep foundation pit are deep, large and complex. It is necessary to take supporting measures for foundation pit first. With the excavation of foundation pit, the supporting structure will begin to bear force and cause deformation, which will cause a lot of damage, such as ground subsidence, structural instability and rupture. This paper, based on the foundation pit support project in a certain area of Shanghai, makes a deep study on the deformation system of the supporting structure inside the row pile. The main work and research contents are as follows: first of all, The main supporting system of foundation pit and its application scope are summarized, and based on the deformation mechanism of deep foundation pit pile, the deformation theory analysis is carried out. Secondly, based on a project in Shanghai, the existing materials in the project are taken as reference. With the help of Midas GTS engineering simulation software, the model of deep foundation pit pile supporting structure is established, and the process of step excavation is simulated. According to the strain cloud diagram, the deformation of supporting pile and the variation law of supporting axial force are analyzed. Combined with the monitoring data obtained from the actual site, the monitoring data and the simulation data are compared and analyzed, and the key technical points of parameter selection and model establishment are verified. Finally, on the basis of the established model, The influence of the parameters such as the depth of the pile, the distance between the piles, the diameter of the pile, the ground overload and the support spacing on the deformation of the supporting pile is studied by using the numerical simulation method.
【学位授予单位】：中国地质大学(北京)
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU753
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本文编号：1578570