Research On Engineering Deformation Monitoring Data Processing And Applications In Vietnam

Deformation Monitoring project is a complex project which need to incorporate some science subjects such as engineering survey, geology, hydrology in order to satisfactorily explain and correctly draw the conclusions about the cause distortion. Deformation monitoring is of great significance in the construction and help to ensure the safety of property and human lives. From the perspective of surveying, not only this work requires accuracy, but the process is complex and tight. Thus from net design step, to selection of equipment for measuring, monitoring methods, processing and analyzing monitoring data, none of the steps can not be overlooked and omitted. Among them, the most important is the processing, distribution of monitoring system performance data from to interpret reasonable cause to create distortion. In the last twenty years all over the world, although the theory and methods of monitoring deformation was extremely rich and diverse, together with the development of science and technology, deformation monitoring research is more and more complete, the primary purpose of which is to make the technique popular and widely used due to its simplicity but still accurate and reliable.Currently, in the construction units, production in Vietnam, the deformation monitoring works in practice is not considered in a proper way, which can be shown in the estimate and evaluation stability of the work, analyzing the causes creating distortion, level of data processing... all is not really tight. In addition, the theory predicts backward deformation is poor, therefore, the analysis results of deformation can not forecast the trend of the movement in future works.To complete the system and the observation of the deformation, which can help to do surveying work in Vietnam, the thesis introduces some new knowledge about the deformation, which is observed to have been widely applied in China and around the world. Also how to use this knowledge in the application works great in Vietnam in the future, which is the most important content that dissertation.Thesis revolves around the stage to perform monitoring of the deformation work, the specific content and research results include:1) To study the control network for monitoring deformation, to present specific methods of monitoring system layout, control network, determine the required accuracy and frequency of monitoring; focus being designing optimal design for monitoring network. To speed up calculations when designing optimized, providing a sequential formula have relatively good performance that is simple to apply. 2) To study pre-processing and monitoring data processing, trying to apply the methods for advanced and modern data processing. To provide a pseudo-inverse matrix, convenient to use for free network adjustment and quasi-stable adjustment-this special formula can incorporate flexible adjustment of the two methods mentioned above. First focus on solving the problem of data preprocessing based on the concept of monitoring data reliability, Baarda research methods and estimation methods and robust statistics to detect, the locate and remove gross error (if any) in the range of initial data. Thereby to select method for estimating solid programming process, because this method not only can simultaneously detect, locate and determine the gross error, but also offer simple formula which is very convenient in programming. Next purpose is to study deformation monitoring, the stability analysis of network points. This is done based on past data preprocessing, then proceed to adjustment of the network; to determine the stability of the network point, a number of research methods commonly used in China, along with proposed a method of combining free network adjustment, fine adjustment of thinking through the stability testing network point, the result is a shifting of the network points; through specific examples demonstrating the usefulness of the measures.3) To study some methods of analysis and forecasting models as methods of deformation analysis in the time series analysis, gray system analysis and Kalman filtering. These methods are relatively of high accuracy, can describe the trend of deformation and movement of the deformable body. These three methods are also more accessible for interpretation and programming. However, theory and applications of these methods in deformation monitoring for surveyor employees in Vietnam are considered new knowledge. Because in survey industry in Vietnam, there hasn’t been such a research about this method, there were only anecdotes about time series analysis and Kalman, and gray system analysis is even less known. Therefore, the thesis studies the basic principles, the process of modeling and monitoring applications in deformation of the three methods above.4) Finally, summing the above knowledge, collaborative research and data processing software capable of solving the problem of deformation observations, paying special attention to the areas of data preprocessing, data processing, analysis and forecasting. Combined with a practical hydro electricity project in Vietnam as an example application to calculate and analyze, from which it made the logical conclusion.For surveyors in Vietnam, the thesis has some new findings as follows:1) To study and systemize Deformation Analytics and Forecasting works;2) To study and provide some special forms of the theory and gross error testing methods such as Baarda theory, robust statistics. 3) To study and provide some special form of the theory and analytical methods for stability of datum points such as Hannover-method, variance of unit weight combination, Weight-selected iteration method.4) To study and provide some special form of the theory and forecasting methods such as deformation time series analysis, the gray system analysis and filtering Kalman.5) To independently research the programming software for data processing surveying work appropriate for application in Vietnam.The author confirs among Vietnamese surveyors no one has studied or addressed the above new findings.A newness of the thesis focused on four main points:1) Provide a sequential formular for appropriate computation in network design and free network adjustment;2) Provide a pseudo-inverse formula applicable in free network adjustment and quasi-stable adjustment which is relatively simple and convenient;3) Propose a method which combines testing and computing the stability of datum points;4) Independently research and programme a software for data processing geodetic works.