悬索桥隧道式锚碇结构位移检测方法研究

发布时间：2018-05-27 16:34

本文选题：悬索桥 + 锚碇结构　；参考：《重庆交通大学》2015年硕士论文

【摘要】：悬索桥是最常见的特大型桥梁,锚碇结构是悬索桥最重要的受力结构,其总体稳定性和受力状态直接影响悬索桥的安全和正常使用。锚碇的蠕变和位移是其受力状况的直观反应,因此,通过对锚碇结构进行蠕变和位移监测从而掌握其状态变化具有重要意义。三峡库区蓄水后,其周边的悬索桥隧道式锚室(锚洞)出现严重的开裂与偏位、锚固区渗水、锚头与散索鞍锈蚀等病害,为确保悬索桥处于安全状态,须对锚碇结构位移进行实时监测。然而,基于隧道式锚碇对地质的特殊要求,实际工程应用较少,所以目前未见对隧道式锚碇结构蠕动位移检测方法的研究文献。本文通过对国内外微位移测量方法、隧道式锚碇应用、围岩稳定性等相关技术进行研究,提出两套锚碇结构位移检测的装置及方法,研究了两装置的组成,提出了测量的步骤和方法。通过搭建模拟实验平台,分别测试两套系统的精度、可靠性、稳定性。以忠县长江大桥和丰都长江大桥为依托,设计实施了其中一套系统。具体的主要研究内容如下:(1)设计了基于激光图像分析的锚碇结构位移检测系统,介绍了系统组成和测量原理,在此基础上提出系统实现方案,并对涉及的相关技术进行详细的理论分析。(2)设计了基于位移差值放大的锚碇结构位移检测系统,介绍了系统的组成,包括基本思想和检测装置的结构,基于对系统误差的修正提出改进方案,分析了改进方案的测量原理和特点。(3)通过搭建模拟试验平台对两套系统分别设计并实施了一系列测试实验,分别介绍了测试目的、条件及设备、过程,对每个系统进行实验论证并得出有效结论,进而对比分析两套系统的性能。(4)将基于激光图像分析的锚碇结构位移检测系统在忠县和丰都两座悬索桥上进行工程实施。针对实际应用提出改进方案,对监测数据进行有效分析,验证本系统的使用性能。实验测试表明两套系统都能对微小位移量进行可靠测量,当测量范围在-20mm—20mm时,基于激光图像分析的锚碇结构位移检测系统的相对误差可控制在10%以内;当基于位移差值放大的锚碇结构位移检测系统所选管内径比例为1:5时,测量精度可达0.1mm,且精度级数随着管内径比例增大而增高。通过分析基于激光图像分析的锚碇结构位移检测系统的工程监测数据,验证了本技术能对锚碇结构位移进行长期监测,且位移精度可达0.1mm,并可得出锚固区的蠕动频率、幅度、长期走势等状态数据。
[Abstract]:Suspension bridge is the most common super large bridge, Anchorage structure is the most important force structure of suspension bridge, its overall stability and stress state directly affect the safety and normal use of suspension bridge. The creep and displacement of Anchorage are the direct response of its stress, so it is of great significance to monitor the creep and displacement of Anchorage structure so as to master the state change of Anchorage. After the storage of water in the three Gorges Reservoir area, serious cracks and deviations occur in the tunnel anchoring chambers (anchors) of the suspension bridges around the three Gorges Reservoir area. In order to ensure that the suspension bridges are in a safe state, the water seepage in the anchoring area, the corrosion of the anchor heads and the saddle of the loose cables, etc. The displacement of Anchorage structure should be monitored in real time. However, due to the special geological requirements of tunnel Anchorage, there are few practical engineering applications, so there is no literature on the detection of creep displacement of tunnel Anchorage structure. Based on the research on the measurement methods of micro-displacement at home and abroad, the application of tunnel Anchorage, and the stability of surrounding rock, two sets of devices and methods for measuring displacement of Anchorage structure are put forward, and the composition of the two devices is studied. The steps and methods of measurement are presented. The accuracy, reliability and stability of the two systems were tested by building a simulation experiment platform. Based on Zhongxian Yangtze River Bridge and Fengdu Yangtze River Bridge, one of the systems is designed and implemented. The main research contents are as follows: (1) the displacement detection system of Anchorage structure based on laser image analysis is designed, and the system composition and measurement principle are introduced. A displacement detection system of Anchorage structure based on the amplification of displacement difference is designed, and the composition of the system is introduced, including the basic idea and the structure of the detecting device. Based on the correction of system error, an improved scheme is put forward, and the measuring principle and characteristics of the improved scheme are analyzed. A series of test experiments are designed and implemented for the two systems respectively by building a simulation test platform, and the purpose of the test is introduced respectively. The conditions and equipment, the process, the experimental demonstration of each system and the effective conclusion, The displacement detection system of Anchorage structure based on laser image analysis is carried out in Zhongxian and Fengdu suspension bridges. According to the practical application, the improvement scheme is put forward, the monitoring data is analyzed effectively, and the performance of the system is verified. The experimental results show that both of the two systems can reliably measure the micro-displacement. When the measurement range is -20mm-20mm, the relative error of the displacement detection system of Anchorage structure based on laser image analysis can be controlled within 10%. When the ratio of inner diameter of pipe selected by displacement detection system based on displacement difference amplification is 1:5, the measurement accuracy can reach 0.1 mm, and the accuracy series increase with the increase of pipe diameter ratio. By analyzing the engineering monitoring data of displacement detection system of Anchorage structure based on laser image analysis, it is verified that this technique can be used to monitor the displacement of Anchorage structure for a long time, and the displacement accuracy can reach 0.1 mm, and the creep frequency and amplitude of anchoring area can be obtained. Long-term trend and other state data.
【学位授予单位】：重庆交通大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U446;U448.25;TP391.41

【参考文献】