| The method used is digital image processing technology.First,the geological information parameters of the structural plane are obtained by interpretation,and then the rock mass quality is evaluated by these parameters.The research content and results are as follows:(1)Using high-precision cameras to take images of the tunnel sidewall and palm face.Due to the shooting environment and camera imaging principle,the captured image will inevitably be distorted.Therefore,it is necessary to perform the interpretation of the geological information before the image Image correction.This paper first uses the template method to correct the distortion of the image,then uses the perspective principle to orthorectify the non-orthogonal projected image,and finally scales the image by scaling.In the software,the written program is used to correct the source image.By comparing the images before and after correction,the result proves that this method is accurate,efficient and reliable.(2)This paper proposes a semi-automatic identification of rock mass structural plane traces The method is to first determine the main structural surface manually and input the control points of the main structural surface in the image,use the control points to improve the recognition accuracy of the main structural surface trace,and then use the automatic recognition algorithm to trace all the structural surfaces Line recognition,and then fit the traces of the main structural surfaces of the two,and finally remove the false edges.Compared with the two methods of manual recognition and automatic recognition,the results prove that the recognition efficiency of this method is significantly higher than that of manual recognition,and the recognition accuracy is significantly higher than that of automatic recognition.(3)By studying the method of digitally interpreting the structural geological information parameters,the radial RQD calculation method is used instead of the original RQD calculation method.At the same time,the trace length,joint spacing,joint large-scale roughness,rock mass volume,and connectivity rate are interpreted.Important parameters,and statistical analysis of probability,improve the interpretation accuracy of the geological information of the structural plane,thereby laying a solid foundation for the subsequent determination of rock mass quality.(4)The DRMR classification method(Digital Rock Mass Rating)is used to evaluate the quality of the rock mass.First,the weights of the factors considered are revised according to the actual situation,and then the digitally interpreted structural plane geological information parameters are substituted into the revised evaluation formula The Bayesian network was established on the software Netica to carry out interval probability evaluation analysis on the rock mass quality of the research object,and then it was compared with the distribution interval probability of the rock mass quality evaluation results of the GSI system.The results show that this method has a higher precision and rationality.(5)According to the systematic research,the rapid evaluation method for the rock mass quality of the tunnel is finally established as follows:1)Establish Bayesian network based on rock mass information in preliminary preliminary survey area.2)Photograph of excavated face rock(Place a ruler or mark).3)Image correction and size conversion.4)Semi-automatic crack identification.5)Acquisition of rock mass quality evaluation parameters based on images(determined value or distribution probability).6)The relevant parameters obtained from the excavation face are substituted into the Bayesian network to quickly obtain the rock mass quality evaluation results of the excavation site.The innovations of this article are: 1)The combination of image correction and rock mass quality evaluation system improves the accuracy of later geological information interpretation and rock mass quality judgment.2)A method of semi-automatically identifying the traces of rock mass structural planes is adopted,thereby improving the accuracy and efficiency of interpretation of traces.3)The rapid evaluation method of tunnel rock mass quality is established based on systematic research. |
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