Research On Some Theoretical Problems Of Data Analysis Of Dam Deformation Monitoring

Deformation monitoring is an important method to ensure building security, which forecasts building security by obtaining dynamical information of deformation in time. Its character includes timing, preceding, and reliability. Deformation monitoring plays an important role in measuring works and science research of engineering deformation. This paper analyzes theory of deformation monitoring, then puts forward several problems that will be studied, which include four parts:(1) Adjustment of Free Network TheoryI study some problems about inner adjustment constraint, which include mathematical meaning, geodetical meaning ,and so on.(2)Datum ConditionI present three popular methods of datum transformation and analyze the adjustment results using the three different methods. Based on the study of datum conditions ,I derive a general solution in free geodetic network adjustment, and give a formula about the relation between datum condition and coordinate system.(3) Test for Datum Mark Stability of Deformation MonitoringBased on the testing of linear hypothesis, 1 derive a fundamental formula of Hannover method and provide a set of methods for deformation analysis. Finally, taking a certain dam as a case study, I verify that the methods could be used for stability analysis.(4) Research on Deformation ModelI derive a general solution for deformation model using least square and additional constraint condition. By changing the model parameters, I got 3 deformation models, including inner-coordinate solution and outer-coordinate solution as well as model coordinate solution which are adopted to process the dam data respectively, and the result shows that neither inner-coordinate solution nor outer-coordinate solution is precise enough for displacement estimate. Although the priori value is coarsely selected, displacement can be determined correctly by the...