邯郸某深基坑桩锚支护FLAC3D模拟对比分析

发布时间：2018-04-11 06:15

本文选题：深基坑 + 桩锚支护设计　；参考：《河北工程大学》2017年硕士论文

【摘要】：随着深基坑工程在建筑行业应用的越来越广泛,有关深基坑支护设计的问题已经成为如今高层建筑设计施工过程中常见的难题之一。基坑支护问题是一个涉及到多方面影响因素的复杂岩土工程问题,例如基坑外界环境、基坑场地土层特点、岩土力学参数以及土体与支护结构相互作用等。本文以邯郸某基坑工程为研究背景,针对深基坑开挖过程中可能会出现的问题,首先运用理正基坑设计软件对基坑进行设计,然后根据施工方案进行开挖和实际监测,另外运用FLAC3D软件对基坑进行数值模拟。主要内容如下:分析基坑工程的主要特点以及变形特性、桩锚支护结构的作用机理。结合实际的场地工程资料和岩土工程勘察资料,用理正深基坑支护软件对2-2区进行了设计计算,得到了支护结构的内力和位移、基坑土体的沉降等。根据本工程的要求对基坑收集现场监测资料,主要监测资料包括基坑土体水平位移值和地表沉降量等。利用FLAC3D软件建立三维数值模型,模拟基坑开挖过程中的土体水平位移值和地表沉降量,且对这些数值进行分析。将设计值、监测值以及模拟值放到一起进行对比分析,分析得出三种方法得到的结果总体趋势保持一致。因此说明深基坑桩锚支护方案设计的合理性、数值模拟模型和参数选取的正确性。此外,在原方案的基础上对支护结构细部参数进行优化。为之后的深基坑工程研究和施工提供重要的参考价值。
[Abstract]:With the wide application of deep foundation pit engineering in the construction industry, the design of deep foundation pit support has become one of the common problems in the design and construction of high-rise buildings.Foundation pit support is a complex geotechnical engineering problem involving many factors, such as the external environment of foundation pit, the characteristics of soil layer, the mechanical parameters of rock and soil, the interaction between soil and supporting structure, and so on.Based on the research background of a foundation pit project in Handan, aiming at the problems that may occur in the course of deep foundation pit excavation, this paper first uses the design software of Lizheng foundation pit to design the foundation pit, and then carries out excavation and actual monitoring according to the construction plan.In addition, FLAC3D software is used to simulate the foundation pit.The main contents are as follows: the main characteristics and deformation characteristics of foundation pit engineering and the action mechanism of pile-anchor supporting structure are analyzed.Combined with the actual site engineering data and geotechnical engineering survey data, the design and calculation of the 2-2 area are carried out by using the support software of Lizheng deep foundation pit, and the internal force and displacement of the supporting structure and the settlement of the foundation pit soil are obtained.According to the requirements of this project, the site monitoring data of foundation pit are collected. The main monitoring data include the horizontal displacement value of foundation pit soil and the amount of ground subsidence.A three-dimensional numerical model was established by using FLAC3D software to simulate the horizontal displacement of soil and the amount of surface settlement during the excavation of foundation pit, and these numerical values were analyzed.The design value, the monitoring value and the simulated value are compared and analyzed together, and the overall trend of the results obtained by the three methods is consistent.Therefore, the rationality of the design of pile-anchor support scheme, the correctness of numerical simulation model and the selection of parameters are explained.In addition, on the basis of the original scheme, the detail parameters of the support structure are optimized.It provides an important reference value for the research and construction of deep foundation pit.
【学位授予单位】：河北工程大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU753

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