涂山路改造龙门浩小学段边坡治理及稳定性监测分析

发布时间：2018-06-17 11:39

本文选题：基坑开挖 + 邻近建筑物　；参考：《重庆交通大学》2014年硕士论文

【摘要】：随着我国的经济发展和城市化建设的加快,城市道路交通设施作为城市重要的基础设施,在城市经济和社会发展中具有基础性、先导性作用。发展城市公共交通,是建设节约型社会、改善城市人居环境、促进城市可持续发展的必要要求,然而目前在建或规划的地铁线均穿过市中心繁华地区,这些地区已经建成各类高架桥、人行天桥、高层建筑、地下管线和既有建筑物。新建的地铁不可避免地要从既有的桥梁、道路、建筑、山体穿过。不论采用浅埋暗挖法还是盾构法基坑开挖施工,施工作业必将对邻近既有建筑物和构筑物的稳定性产生影响。因此,如何在轨道交通建设中保证既有的桥梁、建筑、管线等的安全,降低它们受邻近地铁基坑开挖施工影响的风险是十分重要的课题,急待解决。然而轨道交通的基坑施工开挖过程对邻近坡上建筑的稳定性影响是常见现象。在基坑、边坡开挖前没有充分分析的情况下盲目开挖,极易造成附近建筑物与地下结构的变形及破坏。从目前的相关规范中未就基坑开挖对邻近坡上建筑物的建筑物稳定影响方面做明确规定。基础相关规范中仅提到位于稳定土坡坡顶上的条形和矩形基础建筑,规定了建筑基础边缘至坡顶的水平距离,对于其它类型边坡和基础类型的建筑未做说明,且对基坑开挖-坡体-建筑的研究较少。三者共同耦合作用下建筑物基础的稳定性有待进一步研究。本文以重庆东水门大桥南_立交工程-涂山路改造工程对邻近龙门浩小学稳定性影响为工程背景,采用实地调研、理论分析与实际监测对龙门浩小学边坡稳定性进行对比分析。研究工作及得出的主要结论如下：1.通过调研分析,边坡开挖段所在的龙门浩小学为框架结构,建筑内侧基础采用条形基础,外侧基础采用桩基础,且持力层为基岩；2.通过对该段边坡强风化层和中等风化层的稳定性计算分析,得到直立开挖后该段边坡属不稳定,为了保证坡顶教学楼安全,必须对该边坡进行工程治理稳定后,才能开挖路堑边坡；3.根据勘察结果,边坡破坏模式为强风化岩体沿强中风化界面折线滑移,下滑力大,不易采用原肋板式锚杆挡墙支挡方式,并提出相应的防治措施；4.根据地勘资料,边坡治理范围,设计采用锚拉桩挡墙进行支护,桩顶设置防护栏及截水沟,桩板挡墙根据下滑力和临空高度以及嵌岩条件不同分为四种类型;5.治理后边坡工程监测,应在每一典型边坡段的支护结构顶部应设置不少于3个观测点的观测网,用经纬仪,水准仪,地表位移仲长计等观测位移量,移动速度和方向,地表裂缝监测范围为坡顶40m范围内,坡顶建(构)筑物变形与时间的关系。6.通过监测数据分析,龙门浩小学边坡累积最大水平位移未超过预警值,水平位移连续几日变化速率未超过预警值,边坡累积最大沉降未超过预警值,沉降连续几日变化速率未超过预警值,教学楼外边坡沉降及水平位移趋于稳定；隧道上方(幼儿园处)边坡沉降及水平位移趋于稳定;隧道处深基坑顶部沉降及水平位移趋于稳定;边坡深部位移变化幅度很小,边坡基本稳定,建议继续监测。
[Abstract]:With the development of China's economy and the acceleration of urbanization, urban road traffic facilities, as the important infrastructure of the city, have the basic and leading role in the economic and social development of the city. The development of urban public transport is the necessary requirement for building a conservation oriented society, improving the urban environment and promoting the sustainable development of the city. At present, the subway lines are built or planned through the downtown area, and these areas have been built up of various viaducts, pedestrian overpasses, high-rise buildings, underground pipelines and existing buildings. The new subway will inevitably be worn from existing bridges, roads, buildings, and mountains. Construction and construction work will inevitably affect the stability of adjacent existing buildings and structures. Therefore, how to ensure the safety of existing bridges, buildings, pipelines and so on in the construction of rail traffic and reduce the risk of their impact on the excavation of the adjacent subway foundation pit is a very important issue, which is urgent to be solved. However, the foundation pit of rail transit is applied to the foundation pit. The influence of the excavation process on the stability of the adjacent slope buildings is a common phenomenon. In the foundation pit, the blind excavation of the slope before the excavation is not fully analyzed is easily caused by the deformation and destruction of the nearby buildings and underground structures. In the basic rules, only the bar and rectangular foundation on the top of the slope are mentioned, the horizontal distance from the edge of the building to the top of the slope is defined, and the construction of other types of slope and basic type is not explained, and the research on the foundation pit - the slope body - building is less. The three people are coupled with the building. In this paper, the stability of Longmen Hao primary school is compared and analyzed by field investigation, theoretical analysis and actual monitoring on the stability of Longmen Hao primary school slope. The following are as follows: 1. through the investigation and analysis, the Longmen Hao primary school, which is located in the slope excavation section, is a frame structure. The inner foundation of the building adopts a strip foundation, the lateral foundation adopts the pile foundation and the bearing layer is the bedrock. 2. the slope is unstable after the vertical excavation of the slope, through the calculation and analysis of the stability of the strong weathering layer and the medium weathering layer of the slope. In order to ensure the safety of the slope top teaching building, the cutting slope must be excavated after the slope is treated and stabilized. 3. according to the result of the investigation, the failure mode of the slope is the sliding of the strong weathered rock mass along the strong medium weathering interface, which is not easy to use the original rib plate type anchorage retaining wall, and the corresponding prevention measures are put forward, 4. According to the geological prospecting data and the slope control range, the anchorage pile retaining wall is used to support, the pile top is set up the protective fence and the cut ditch. The pile plate retaining wall is divided into four types according to the sliding force, the altitude of the air and the rock socketed conditions, and the 5. treatment slope engineering monitoring should be set up not less than 3 at the top of the support structure at each Canon type slope section. Observational network of observation points, using theodolite, leveling instrument, surface displacement secondary length meter and other observation displacement, moving speed and direction, surface crack monitoring range is 40m range of slope top, the relationship between deformation and time of construction (structure) on the top of slope.6. through monitoring data analysis, the maximum horizontal displacement of Longmen Hao Xiao Xue slope does not exceed the early warning value and level position. The maximum subsidence of the slope has not exceeded the early warning value for several days, and the maximum settlement of the slope has not exceeded the early-warning value. The settlement and horizontal displacement of the slope outside the teaching building tend to be stable; the slope settlement and horizontal displacement above the tunnel (kindergarten) tend to be stable; the settlement and level of the top of the deep foundation pit in the tunnel The displacement tends to be stable, the slope displacement is very small, and the slope is basically stable. It is recommended to continue monitoring.
【学位授予单位】：重庆交通大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TU753

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