Shear Mechanism Based On 3D Printing Of Joints Reconstruction Method

Model test and shear strength of structural plane identical morphology obtained by white light scanning instrument, 3D printers and ultrafine quartz sand and quick setting cement in order to study the relationship between structure surface morphology and structure of the shear strength of the interface. It can get conclusions as follows based on the structural surface coupling samples repeated production method, space point cloud data acquisition method, structure local damage area accurately describe the method, three axial force deformation characteristics.The use of 3D scanning instrument with the natural rock structural plane point cloud data can be made with the structure of the 3D virtual model. Using 3D printing technology and PLA materials can produce the structure of the model with similar material printing, print model into the sample box can be made fully consistent with the structure of the coupling of shear specimen. Through the center line of the 3D virtual model, print model and shear specimen model of the average height of sample preparation precision were compared, proved this method contains duplicate structure coupled shear specimen is reliable.Putting forward two kinds of interpolation method to interpolate the point cloud data and compare the two methods in order to get the space point cloud data on the structure of surface features were analyzed. Using triangular gridding interpolation can get equal space point cloud data. Analysis of 12 kinds of interpolation methods, finally obtained the structure of the space point cloud data determined by local polynomial method.Calculus mathematics thought in the structure, the surface is divided into several square element boundary projection length of exactly the same. Parameters of 3D parameters for each element that is representative of the region, the accuracy of method validation shows that this method to describe texture surface destruction has higher for example.The shear strength formula has been obtained according to the changes of the different axial pressure of three sampling curve analysis of structure surface shearing failure model.