基于DFOS的三峡马家沟滑坡长期监测与趋势分析

发布时间：2017-12-31 01:28

本文关键词：基于DFOS的三峡马家沟滑坡长期监测与趋势分析　出处：《南京大学》2017年硕士论文　论文类型：学位论文

【摘要】：滑坡是一种发生频率很高的地质灾害,给人民的生命财产带来重大损失和威胁。滑坡的监测对于滑坡形成机理研究和预测预警具有重要意义,而滑坡监测技术的不断创新,是提高滑坡防灾减灾水平的重要途径。本文以三峡马家沟滑坡为监测评价对象,采用分布式光纤感测技术(简称DFOS),构建了三峡马家沟滑坡多场DFOS监测系统;开展了 FBG倾角传感器性能测试试验;结合DFOS长期监测结果,建立了马家沟滑坡灰色系统理论模型,并对该滑坡的发展趋势进行了预测。论文主要取得了以下成果:(1)设计了边坡多场信息DFOS监测总体方案以及变形场、水分场、温度场等具体监测方案。(2)开展了 FBG倾角传感器的性能测试试验,验证了该技术应用于滑坡监测的可行性,同时对传感器的进一步改进提出了建议。(3)将灰色系统理论引入边坡稳定性分析中,并论证了该方法在边坡稳定性分析中的可行性;建立了滑坡变形发展中的灰色系统理论模型,介绍了建模步骤。(4)依托三峡马家沟滑坡监测项目,设计并建立了三峡马家沟滑坡多场DFOS监测系统,介绍了滑坡的感测光缆布设新工艺以及监测过程中需注意的事项。(5)分析了三峡马家沟滑坡五年的DFOS监测数据,对每一个场的监测结果进行了分析,在水分场与变形场之间建立了多场数据关联规则。研究结果表明:库水位是滑坡稳定性的最大影响因素,具体表现为库水位升高时,位移速率降低,滑坡稳定性升高;库水位降低时,位移速率升高,滑坡稳定性降低。(6)据于DFOS监测数据,建立了马家沟滑坡灰色系统理论计算模型,并对马家沟滑坡的发展趋势进行了预测。研究结果表明:马家沟滑坡当前仍属于蠕变型滑坡。
[Abstract]:Landslide is a kind of highly frequent geological disasters, brought great losses and threats to people's lives and property. The landslide monitoring is of great significance for the study on the mechanism of the formation and prediction of landslide, landslide monitoring technology innovation, is an important way to improve the level of landslide disaster prevention and mitigation. In this paper, the Three Gorges Majiagou landslide the monitoring and evaluation of the object, using the distributed optical fiber sensing technology (DFOS), the construction of the Three Gorges Majiagou landslide field DFOS monitoring system; carry out the FBG tilt sensor performance test; long-term monitoring results with DFOS, established the Majiagou grey system theory model of landslide, and the development trend of the landslide is predicted. The main achievements are as follows: (1) the design of slope multi field information DFOS monitoring scheme and deformation field, moisture, concrete temperature field monitoring scheme. (2) carried out FBG The performance testing of angle sensor, verify the feasibility of the technology used in landslide monitoring, and puts forward some suggestions on the further improvement of the sensor. (3) the grey system theory is used in slope stability analysis, and demonstrate the feasibility of this method in slope stability analysis; grey system theory model in the development of the landslide deformation establish, introduces the modeling steps. (4) based on the Three Gorges Majiagou landslide monitoring project, set up Three Gorges Majiagou landslide field DFOS monitoring system is designed and the matters needing attention in the process of landslide sensing cable layout and monitoring process. (5) analysis of the DFOS monitoring data of three Gorges Majiagou landslide five the monitoring of each field results were analyzed between the moisture field and deformation field established multi field data association rules. The results show that: the reservoir water level is the most slippery slope stability Major influencing factors, the specific performance of the reservoir water level rises, the displacement rate decreased, landslide stability increased; water level decreases, the displacement rate increased, landslide stability decreased. (6) according to the monitoring data of DFOS, established the calculation model of grey system theory in Majiagou landslide, and the development trend of Majiagou landslide forecast. The results show that Majiagou landslide at present still belongs to the creep landslide.

【学位授予单位】：南京大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：P642.22

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