横江流域电站蓄水对库区桥梁安全影响的评价

发布时间：2018-05-24 02:08

本文选题：水库蓄水 + 水岩相互作用　；参考：《西南交通大学》2014年硕士论文

【摘要】：横江流域电站蓄水后,库区内桥梁受到水位的变化,其稳定性将会发生改变,直接影响到桥梁的稳定性和铁路的运行安全。本论文在充分集利用已有资料和现场调查的基础上,查明了横江流域研究区的工程地质条件、岩土体结构及物理力学特性,分析了水库蓄水后水对库区桥梁的影响主要是水岩相互作用,具体表现为物理作用、化学作用以及力学作用。接着通过对蓄水对研究区所有铁路桥梁安全的影响进行分析总结,得出14座桥梁受到到一定的影响；然后从中选取了三座受影响较大的桥梁,先是通过计算图解法中的卡丘金方法对库岸边坡进行了塌岸预测,结果表明,水库蓄水后库岸边坡受水位的影响将产生不同程度的塌岸；然后通过flac3D数值模拟软件,对库岸边坡在蓄水前和蓄水后两种状态下分别进行稳定性模拟分析,计算结果表明,库岸边坡在蓄水前的天然状态下位移量很小,处于稳定状态；在蓄水后的状态下则处于不稳定状态,位移量较大,可能发生塌岸现象,对边坡位置上的桥梁墩台的稳定性产生较大的影响。最后,归纳总结了蓄水引发的桥梁常见基础病害类型,主要有基础沉降、基础滑动、基础倾覆、墩台及桩基础腐蚀破坏；并通过分析病害的产生条件和机理分析及对桥梁使用性能的影响,提出相应的处治措施建议。
[Abstract]:After the storage of the hydropower station in the Hengjiang River Basin, the bridge in the reservoir area will be changed by the change of water level, and its stability will be changed, which will directly affect the stability of the bridge and the safety of the railway operation. Based on the existing data and field investigation, this paper finds out the engineering geological conditions, rock and soil structure and physical and mechanical properties of the study area of the Hengjiang River Basin. It is analyzed that the influence of water storage on the bridge in the reservoir area is mainly the interaction of water and rock, which is manifested by physical, chemical and mechanical effects. Then through the analysis and summary of the influence of water storage on the safety of all railway bridges in the study area, it is concluded that 14 bridges are affected to a certain extent, and then three more affected bridges are selected. Firstly, the bank collapse is predicted by the Kachujin method, which is used in the graphic method. The results show that the bank slope will collapse to different extent after the reservoir impoundment, and then the flac3D numerical simulation software is used to simulate the collapse of the bank slope, and the results show that the reservoir bank slope will be affected by the water level after the reservoir impoundment. The stability of bank slope is simulated before and after storage. The results show that the displacement of bank slope is small and stable in the natural state before storage. Under the condition of impoundment the stability of bridge pier and abutment in the position of slope is greatly affected by the unstable state and the large displacement which may occur the phenomenon of bank collapse. Finally, the types of bridge foundation diseases caused by impoundment are summarized, including foundation settlement, foundation sliding, foundation overturning, piers and abutments and pile foundation corrosion damage. Based on the analysis of the conditions and mechanism of the disease and the influence on the performance of the bridge, the corresponding treatment measures are put forward.
【学位授予单位】：西南交通大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U447;TV62

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