Papers by Keyword: Deformation Monitoring

Abstract: It is important to control the deformation condition of building foundations, which can change throughout period of operation. One of the criteria for evaluation of deformation of foundations is the vertical differential settlement. The hydrostatic leveling system is a technique to measure differential vertical settlements of foundation. It is possible to provide many standard constructions with sufficient accuracy of measuring settlements by using technically simple variants of the hydrostatic leveling system. Examples of using hydrostatic leveling systems for five-storey brick masonry building, monolithic reinforced concrete building and a historic 18th century building are given.

Abstract: Based on establishing monitoring network in accordance with the requirements of criterion, monitoring network for deep foundation pit in the people's hospital of jilin province has been taken as research object to collect multi-period network information. Based on free net adjustment method, the combined adjustment has been carried out in multi-period plane network. Choosing displacement variation of two control points as mean spacing in plane network, and using mean spacing method program in MATLAB platform to calculate sample and population variance of observed value, structure F distribution and analyze the stability of monitoring points. The results show that using mean spacing method can rapidly distinguish the stability of monitoring network and points, which offers reliable gist for monitoring project.

Abstract: s: This paper mainly uses the ground three-dimensional laser scanning technology to collect the date of two coal mining deformation point cloud. First of all, according to the distance measurement precision and scanning point spacing scanning scheme is designed; then, focuses on the analysis of scanner splicing error; finally, through three ways : dot, line, face; we do compare analysis to two deformation and obtain the deformation results of the entire mining area. The experimental results show that: three-dimensional laser scanning technology has these advantages: high work efficiency, high data accuracy, obtaining the deformation data of subsidence zone of the whole basin.

Abstract: The traditional steel structure deformation monitoring generally uses Total Station and GPS to do monitoring quality control, but there are some disadvantages of these methods. Laser radar technology is a new non-contact measurement technology emerged in recent years. It is ideal for installation and slip construction quality monitoring of large-span steel structure. This paper use laser radar technology to monitor large-span steel structure construction, use laser scanner to scan on steel every period of time and collect 3D point cloud data of the feature points after a period of time. Through the comparative analysis of the data and the chart which reflect the amount of deformation of the feature points, it can accurately obtain the result of structural deformation, oblique direction, and the deviation between the actual coordinates and the design coordinates, which provides the most accurate and direct information for the project. Laser radar technology solves the difficult issues such as workload outside the industry and difficulties in visibility of the traditional measurement methods, greatly improves accuracy and efficiency compared to traditional methods, and achieve a high-precision quality control over the construction.

Abstract: This article took gravity wharf engineering as the object of study to explore its deformation law by using GPS positioning technology. First, we will introduce the layout of a GPS control network at the wharf and then monitor the displacement of the gravity wharf through GPS-RTK、DBS-RTK and GPS static positioning technologies separately. Comparing three groups of monitoring data, we came to the conclusion that this gravity wharf is very stable, which has also proved the feasibility to apply GPS positioning technology to the displacement monitoring of the gravity wharf.

Abstract: To ensure the safety of bridge bearing replacement procedure, the project introduces the real-time monitoring technology. Collects displacement data, stress data, elevation and temperature are collected by displacement sensor, stress sensor and so on. Data processing and analyzing by the computer provides guidance for replacement procedure. The results of the monitoring and timely analysis of data collation provide guidance for the replacement process. Engineering practice results show that real-time monitoring technology is an important means to ensure the bearing replacement safe, but it should develop a reasonable scientific monitoring program.

Abstract: Over the past decade, the studies have been growing rapidly on application of Synthetic Aperture Radar Interferometry (InSAR) technology to landslide deformation monitoring. On the basis of InSAR ground reflector, the paper has improved the design, produced a new InSAR reflector and successfully applied to Three Gorges Reservoir Shuping Landslide deformation monitoring.

Abstract: Three-dimensional laser scanning can obtain the complete geometry information of the dam quickly and accurately, and then achieve the overall deformation monitoring, which breaks the traditional limitation of single point monitoring and local monitoring. In this paper, the complete point cloud data of the dam was obtained by three-dimensional laser scanning technology, and the surface model of the earth-rock dam was constructed by three-dimensional spherical projection surface dam construction algorithm. Then the accurate three-dimensional surface model of the earth-rock dam was acquired, and the first phase of the model as reference model,with different periods of point cloud data collected were analyzed with the reference model to obtain information about the dam deformation.

Abstract: In this paper, an algorithm of combining the Coherence Factor Thresholding (CFT) method, Amplitude Deviation Thresholding (ADT) method and Intensity Index Thresholding (IIT) method ( Triple Thresholding: TT algorithm) is designed, which can be applied in the identification of PS points in the PSInSAR algorithm to monitor the ground deformation, On the basis of analyzing and comparing the deficiency of each identification method, the detail flow of the TT algorithm has been designed, which will perform more suitable to monitor the ground deformation theoretically. The real data experiment using the algorithm will be carried out in further work.

Abstract: The all-weather, non-contact and high-accuracy deformation monitoring can be realized by using the GB-SAR system, which includes three key technologies such as Stepped Frequency Continuous Wave (SF-CW), synthetic aperture radar (SAR) and interferometry. In this paper, a deformation monitoring experiment made at Geheyan Dam is described. The effects on the monitoring data caused by atmospheric changes are analyzed, and the monitoring results are statistically analyzed. The results show that the deformation information of the entire dam surface can be reflected accurately with the monitoring data corrected by the environmental correction methods, and these corrected data can be used for analyzing the stability of the dam.