阜新市全科医生临床培养基地基坑监测与数值分析

发布时间：2019-02-12 12:38

【摘要】：自中国改革开放至今,城市化建设在迅速发展中,人口量快速增长,使人们对生活空间的需求量增大,从过去的平房到现在的高层、超高层建筑,不仅建筑物的高度在不断增加而且建筑物的规模也越来越大。为了不影响城市规划,人们开始向开发和利用地下空间发展,因此深基坑工程的发展也成为一个热点的课题。基坑工程的施工涉及到很多方面,像工程地质条件、基坑支护形式和区域内土体力学状态都是影响基坑工程安全施工的因素,深基坑工程涉及面如此广泛使它具有复杂性、区域性和风险性的特点,如果一个基坑工程发生了事故会造成不可估计的后果。使每个基坑工程能够选择一个正确的支护形式和支护设计方案是保证基坑工程施工安全的关键。由于基坑在施工过程中不可预见性很高,所以为了随时掌握基坑开挖过程中的变形情况,进行施工现场监测是必不可少的一部分。本文以阜新市全科医生临床培养基地的基坑工程为研究背景,通过理正基坑软件的计算结果、施工现场监测和数值模拟对基坑变形机理、桩锚支护特点等进行分析,主要包括以下内容：(1)列举了现阶段基坑支护的类型,总结了基坑变形机理,包括坑底隆起变形、坑外地表沉降和围护结构变形等三部分,并分析了基坑变形因素及其预防措施。阐述了基坑土压力理论和支护结构的静力计算。(2)结合岩土工程勘察资料和实际工程场地条件,运用理正深基坑软件对剖面二进行基坑支护设计计算,取得了基坑的内力与位移、土体的沉降位移、支护结构的配筋和基坑整体稳定性分析等。确定支护方案后,按照工程场地特点和规范要求进行基坑监测工作的布置,主要监测基坑土体水平位移、基坑周边地表沉降和锚索轴力等,获取监测结果,完成监测工作。(3)本文运用ADINA软件,对本基坑开挖过程进行了二维模拟,模拟了基坑开挖过程中周边地表沉降、基坑土体水平位移和锚索轴力,并取得了模拟结果并对其进行总结分析。(4)最后,将理正软件的计算值、现场监测值和ADINA数值模拟值进行对比分析,发现三者得到的结果基本保持一致,这说明理正深基坑支护软件的设计计算是可行的,数值模拟的建模和参数选择是正确的。为深基坑工程研究提供参考,保证了实际基坑工程施工的安全性,优化基坑设计方案。
[Abstract]:Since China's reform and opening up to the present, urbanization has been developing rapidly, and the population has grown rapidly, which has increased the demand for living space, from the past bungalows to the high-rise and super-high-rise buildings. Not only is the height of the building increasing, but the size of the building is also growing. In order not to affect urban planning, people began to develop and utilize underground space, so the development of deep foundation pit engineering has become a hot topic. The construction of foundation pit works involves many aspects, such as engineering geological conditions, the form of foundation pit support and the mechanical state of soil in the region are the factors that affect the safe construction of foundation pit engineering. Regional and risk characteristics, if an accident occurs in a foundation pit project, it will cause incalculable consequences. It is the key to ensure the construction safety of foundation pit engineering to select a correct supporting form and support design scheme for each foundation pit project. Because the foundation pit is unpredictable in the construction process, in order to grasp the deformation of the excavation process at any time, the construction site monitoring is an essential part. In this paper, based on the foundation pit engineering of clinical training base of general practitioners in Fuxin City, the deformation mechanism of foundation pit and the characteristics of pile and anchor support are analyzed through the calculation results of foundation pit software, site monitoring and numerical simulation. The main contents are as follows: (1) the types of foundation pit support at the present stage are listed, and the deformation mechanism of foundation pit is summarized, which includes three parts: the uplift deformation of pit bottom, the settlement of surface of pit and the deformation of enclosure structure. The deformation factors of foundation pit and its preventive measures are also analyzed. The earth pressure theory of foundation pit and the static calculation of supporting structure are expounded. (2) combined with geotechnical engineering survey data and actual engineering site conditions, the design and calculation of foundation pit support for section 2 are carried out by using the software of Lizheng deep foundation pit. The internal force and displacement of foundation pit, the settlement displacement of soil, the reinforcement of supporting structure and the whole stability analysis of foundation pit are obtained. After the supporting scheme is determined, the layout of foundation pit monitoring work is carried out according to the characteristics of the engineering site and the requirements of the specifications. The monitoring results are obtained by mainly monitoring the horizontal displacement of the foundation pit soil, the ground subsidence around the foundation pit and the axial force of the anchor cable, etc. (3) in this paper, the excavation process of the foundation pit is simulated by using ADINA software, which simulates the ground subsidence around the foundation pit, the horizontal displacement of soil and the axial force of anchor cable. The simulation results are obtained and analyzed. (4) finally, the calculated values of the software, the field monitoring values and the numerical simulation values of ADINA are compared and analyzed, and it is found that the results obtained by the three methods are basically the same. This shows that the design and calculation of Lizheng deep foundation pit support software is feasible, and the modeling and parameter selection of numerical simulation are correct. It provides a reference for the research of deep foundation pit engineering, ensures the safety of actual foundation pit construction, and optimizes the foundation pit design scheme.
【学位授予单位】：辽宁工程技术大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TU753

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