The Triaxial Orthogonal Finite Element Numerical Simulation Of Optimum Structure Of Gujiatai Iron Ore Stope

This text takes grouting purdah and deep part exploitation of Gujiatai iron mine as Engineering setting,basing on investigation and summae of abundance geological materials of Gujiatai iron mine,triaxiality compression,triaxiality permeability and general rock mechanics test were put up on samples of grebody roof (contains grouting roof),floor,ore and filling pulling from locale by using MTS815.02 rock mechanics test system,receiving all classes physical mechanics parameter of rock and the changing rule. And then set up three dimentional model of mine stope by using ANSYS which is umbrella general FE numerical simulation attaching orthogonal design method,carrying on mechanics analyse of triaxiality stope mining and the progress of cut and fill method under multi-parameters' condation,receiving the influence of stability of stope by size of stope room,slicing thickness and grouting layer thickness,hereby confirm optimum stope structural parameters.Textual chief studies program are as follows:[1] After strict investigation and analysis on hydrogeological condition of mine, learning that the grebody roof has the most threatening on mining, comfirming the keystone of numerical simulation analysis is the roof, and the rock samples are all from flush drilling of -100m level.(2) We make the general tri-axial test,tensile strength test,uniaxial compression test,experiment research on the permeability, geotechnical test of fillings on core sample from locale,getting all classess physical mechanics parameter of rock,affording credible material parameter to numerical simulation,and also affording test data to textual continuous research.[3] Putting up three dimentional numerical simulation on actual mining process by using method of combining orthogonal design with FE numerical simulation,according as the mining way of mining area and using the life-death function offered by ANSYS. Design table of 4 factors and 3 levels came into use,the most subsidence,the most tensile stress and equivalent plastic strain of roof act as the criterion of stability analysis of stope excavation,receiving the factors influence on stability in turn is size of stope room,slicing thickness and grouting thickness of roof after range analysis on test result.(4) By analysis on 9 projects, the roof settlement,roof tensile stress and roof equivalent plastic strain were found show themselves the direction of general inosculation ,thereinto project 4 almost are the least on three factors which affect stability of roof(the most subsidence is 4.8mm,the most tensile stress is 1.45MPa,the equivalent plastic strain is 0. 311e-5),by another way,project 4 is just the best design of orthogonal finite element.