复合土钉墙支护技术在黄河三角洲地区的研究与应用

发布时间：2018-06-17 09:56

本文选题：黄河三角洲地区 + 复合土钉墙　；参考：《中国石油大学(华东)》2014年硕士论文

【摘要】：复合土钉墙支护技术,克服了土钉支护的局限性,因其经济可靠、快速简便的特点,在深基坑开挖施工中得到愈来愈多的应用。目前,复合土钉墙支护的理论研究落后于工程实践。有限元分析方法用于支护研究的主要困难在于选择合适的计算模型和输入参数。结合实际工程,把数值模拟和实测数据结合起来,利用有限元分析方法研究支护工程的变形和力学特征,对复合土钉墙支护技术的理论研究、支护设计方案的选择和技术论证具有重要的意义。作者总结了前人在复合土钉墙支护方面的研究成果,以东营市某基坑工程为基础,根据其特殊的软土地质条件,进行基坑的设计施工与监测,并利用有限元软件ANSYS建立有限元模型进行数值模拟,比较模拟和实际监测结果,对复合土钉墙支护在黄河三角洲地区的应用进行了探讨研究。主要工作如下:(1)对于基坑工程的设计、施工与监测等工作环节进行总结分析。首先根据其工程概况、地质条件及周边环境,进行多种支护形式的综合比较,选择了复合土钉支护体系;对于复合土钉墙支护体系进行分段支护设计,并验算其稳定性;其次对本基坑工程的施工及组织管理进行简述,提出本基坑工程监测方案,最后对监测结果进行分析。(2)利用ANSYS软件建立模型,模拟分析不同工况条件下实际工程的变形特征。研究表明,坑壁水平位移和基坑隆起位移之间存在一定的联合关系。土钉的受力具有开挖效应,工程应用中应该及时安置土钉以使土钉尽快发挥作用,减小基坑开挖过程中的基坑变形。
[Abstract]:The composite soil nailing wall support technology has overcome the limitation of soil nailing support and has been applied more and more in the construction of deep foundation pit because of its economic reliability and rapidity and simplicity. At present, the theoretical study of composite soil nailing wall support lags behind engineering practice. The main difficulty of finite element analysis in supporting research lies in the selection of appropriate calculation model and input parameters. Combined with the actual engineering, the numerical simulation and the measured data are combined, the deformation and mechanical characteristics of the supporting engineering are studied by using the finite element analysis method, and the theoretical research on the supporting technology of the composite soil nailing wall is made. The selection of supporting design scheme and technical demonstration are of great significance. Based on a foundation pit project in Dongying city and according to its special soft soil geological conditions, the author summarizes the research results of the composite soil nailing wall support, and carries out the design, construction and monitoring of the foundation pit according to its special soft soil geological conditions. The application of composite soil nailing wall support in the Yellow River Delta region is studied by using the finite element software ANSYS to establish the finite element model to carry on the numerical simulation, compares the simulation and the actual monitoring result. The main work is as follows: 1) summing up and analyzing the design, construction and monitoring of foundation pit engineering. Firstly, according to the general situation of its engineering, geological conditions and surrounding environment, the composite soil nailing support system is selected according to the comprehensive comparison of various supporting forms, and the design of the composite soil nailing wall support system is carried out, and the stability of the composite soil nailing wall support system is checked and calculated. Secondly, the construction and organization and management of the foundation pit engineering are briefly described, and the monitoring scheme of the foundation pit engineering is put forward. Finally, the monitoring results are analyzed. Finally, the model is established by using ANSYS software, and the deformation characteristics of the actual engineering under different working conditions are simulated and analyzed. The study shows that there is a certain joint relationship between horizontal displacement of pit wall and displacement of foundation pit uplift. The stress of soil nailing has excavation effect. Soil nailing should be placed in time in engineering application in order to make soil nailing play its role as soon as possible and reduce the deformation of foundation pit during excavation.
【学位授予单位】：中国石油大学(华东)
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TU476

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