地下车库深基坑施工效应监测与分析

发布时间：2018-01-09 13:34

本文关键词：地下车库深基坑施工效应监测与分析　出处：《郑州大学》2017年硕士论文　论文类型：学位论文

【摘要】：深基坑工程包含很多专业的内容,主要有结构工程、岩土工程、相关施工技术和监测技术等方面,工程地质的复杂、城市地下空间支护形式的繁多使得深基坑工程的施工难度大增,深基坑的开挖土体上部的卸载必然引起土体性质发生改变进而引起支护结构的变形,因此对深基坑工程施工过程的监测分析就显得十分重要。为保证施工的顺利进行以及给后续相似工程的建设提供依据,进行深基坑施工监测分析就显的尤为重要。因此,本文论述了深基坑支护结构的变形理论,结合工程现场情况和地质情况,采用相应设计软件对工程典型断面进行计算,制定支护桩施工、降水施工等深基坑主要施工方法,并对典型断面进行施工效应监测与分析。主要结论如下:(1)确定支护结构典型剖面采用支护桩、土钉墙支护,上部九排土钉。对典型断面支护结构进行计算,将开挖和支撑分七种工况计算作用在支护结构的土压力,以及支护结构相应的位移、弯矩和剪力,其中,支护结构计算最大位移为34.13mm。(2)根据工程特点以及设计计算相关成果,为控制土方开挖带来的周边环境变形,土方采用盆式开挖的方式,分五次进行分段、分层的开挖。(3)对典型断面的基坑坡顶进行水平位移监测,35个月2个监测点的累积位移变形量分别为17.7mm和18.3mm,大约只有设计计算值的1/2,说明盆式开挖可以有效控制基坑变形。(4)对典型断面的基坑坡顶进行竖向位移监测,2个监测点的竖向位移累积变形量分别为8mm和8.8mm,现场监测表明,支护结构中坡顶沉降与最大水平位移之间有一定的比例关系。就本工程而言,坡顶沉降约为水平位移值的1/2。(5)本工程各项监测数据结果均在规范和设计规定的经警指标范围内,说明本工程支护方式有效,施工方法切实可行,可为类似工程提供参考。
[Abstract]:Deep foundation pit engineering contains a lot of professional content, the main structural engineering, geotechnical engineering, construction technology and monitoring technology, engineering geological complex, city underground space support form there makes increased the difficulty of construction of deep foundation pit, the upper structure excavation soil unloading will cause the change of soil properties and then cause the deformation of the retaining structure, so the monitoring and analysis of deep foundation pit engineering construction process is very important. To provide the basis for the construction to ensure the smooth progress of the construction and subsequent similar projects, analyzes the construction of deep foundation pit monitoring is particularly important. Therefore, this paper discusses the theory of deformation of retaining structure of deep foundation pit combining with the engineering field, and the geological condition, the design of the corresponding software to calculate the typical section of the project, to develop supporting pile construction, construction of deep foundation pit, the main precipitation To the construction method, and monitoring and analysis the effect of the construction of the typical section. The main conclusions are as follows: (1) to determine the supporting structure of typical section by supporting pile, soil nailing wall, the upper nine rows of typical section structure. The soil nailing support is calculated, the excavation and support seven kinds of working conditions in the calculation the soil pressure of retaining structure, supporting structure and the corresponding displacement, bending moment and shear force, the calculation of the maximum displacement of supporting structure for 34.13mm. (2) calculation results according to the engineering characteristics and design, to control the deformation of the surrounding environment caused by excavation of earthwork, the basin excavation way, divided into five segments layered excavation, foundation pit slope. (3) the typical section of the horizontal displacement monitoring for 35 months, the cumulative displacement deformation of 2 monitoring points were 17.7mm and 18.3mm, only about the design and calculation of the value of the 1/2, said the basin excavation can effectively To control the deformation of foundation pit. (4) the typical section of the foundation pit slope monitoring of the vertical displacement, the vertical displacement of the cumulative deformation of 2 monitoring points were 8mm and 8.8mm, the monitoring results indicate that in the supporting structure of the top settlement of a certain percentage of the relationship between the maximum horizontal displacement. The project is concerned, the top settlement is about the horizontal displacement values of 1/2. (5) of the monitoring data are specified in the results of this project the specification and design of the police range of indicators, the project supporting effective construction method is feasible and can provide reference for similar engineering.

【学位授予单位】：郑州大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU753

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