Inversion of rock mechanical parameters with Kalman filter based on indentation test
The indentation test is an important method for indirect evaluation of rock mechanical properties.In order to better utilize the indentation test to evaluate the mechanical parameters of rock masses,this study proposed a method of parameters inversion based on the extended Kalman filter algorithm.The load-depth curve was first obtained from the indoor indentation test.Then,the response relationship between the elastic-plastic parameters of rock masses and the indentation curve was constructed through a model for numerical simulation of elastic-plastic behavior.Finally,the Kalman filter algorithm was used to achieve inversion and the optimized analysis of the elastic-plastic parameters of rocks.The results indicated that the inversion had good convergence and high accuracy of recognition,and the relative errors of the mean of elastic parameters of rocks obtained from inversion was about 10%,while the relative errors of the inversion results of plastic parameters was less than 20%.Compared with the traditional and single method of empirical formula,the method proposed in this study has higher accuracy of prediction and better applicability for rock masses with different lithology.
rock mechanics parametersindentation testKalman filterinversion analysisresponse surface
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