Based On The Reconstruction Of The Fracture Surface Using 3d Scanning Technology And Seepage Law Research

Current rock fracture seepage research is given priority to with 2d,for widely exists in the engineering of three dimensional seepage law to carry on the quantitative description,the fracture surface and fracture surface geometry parameters on the influence law of equivalent permeability coefficient,in this paper,with the aid of the three-dimensional laser scanning technology.rock mass fracture of 3d will rebuild,3d visualization will achieved,3d digital model will established.For the study of fracture surface geometric parameters such as the roughness coefficient(JRC),the fractal dimension(D)and width of fissure(e)influence on three-dimensional seepage law of rock mass,numerical simulation and physical experiment including 1 natural fracture structure and 10 groups parameter regularly changing fracture structure will carry.based on Navier-Stokes equations to simulate the fluid flow in the fracture surface,calculate the equivalent permeability coefficient,analyzed the equivalent seepage coefficient of roughness coefficient JRC,fractal dimension D and gap width e change rule.The main works of this dissertation are as follows:1.Collecting rock samples,grouping base on fracture occurrence,reconstructing the sample fracture surface based on 3d laser scanning technology,extracting sample fracture surface feature irregularity and geometric parameters(such as the rough height standard deviation,relative height and root mean square and the rough height average)with 3d roughness coefficient of quantitative relationship.2.Five groups of fracture surface is reconstructed and set the values of the parameters,according to the fracture surface characteristic parameters and 3d quantitative relationship between roughness coefficient,it is concluded that the value of the fracture surface characteristic parameters such as the rough height standard deviation,Standard deviation according to the height of the rough,rough highly RMS,rough average height,generate the reconstruction of the fracture surface point cloud data,using the Surfer software rebuilt the three-dimensional geometric models of crack.3.Being 15 set of fracture surface(10 natural fracture surface and 5 group reconstruction fracture surface)into ABAQUS CFD module.Based on continuous medium model finite element analysis method,carrying numerical simulation on rock mass fracture percolation flow,calculating equivalent percolation coefficient for each group,establishing function relationship between equivalent permeability coefficient and fracture parameters.4.Selecting the typical rock fracture surface,generating the corresponding fracture surface,using electricity spark technology production of 10 typical fracture template cement mortar pouring for different sample.Carrying core permeability experiment to sample,measuring fracture permeability coefficient.5.Numerical simulating to the samples by finite element analysis software ABAQUS,comparing the numerical result with physical experiment result,verify and correct the established the three-dimensional rock fracture formula of equivalent permeability coefficient,determine the correction factor.