| Because of the limitation of the existing conditions of hard rock uranium resources in the south of China, the new mining methods such as the in-situ leaching mining can not be used; the traditional mining method is still the main mining method of hard rock uranium deposits in South China. Using digital means assist in Deposit development and construction design based on conventional uranium mining method, not only can improve design efficiency and accuracy, but also lay the foundation for the mine production of intelligence, serving for scientific management, improving mine productivity and ensuring safety in production.In this paper, the scheme of the development and construction of a hard rock uranium deposit in the south of Jiangxi province as the background, in view of the geological conditions of the deposit,occurrence conditions and characteristics of ore, through the technology of 3D visualization of geological modeling, development schemes are modeled and preferred, and through the field survey sampling, laboratory test and numerical simulation method, stability simulation and analysis of different structural parameters of typical stope of overall mining of thetarget deposit are made. The main contents and results of this paper are as follows:(1) Field geological investigation of the target area was made,collecting geological data, and according to the geological data put forward the scheme of mine to open up, using 3DMine software to establish a preliminary mine develop the 3D visual model and optimize and choose the optimal development scheme, laying foundation for in-depth digital mine construction of the target deposit.(2) Ore and rock of a hard rock uranium deposit in south of Jiangxi province were sampled, and the specimens were subjected to indoor uniaxial or triaxial compression rock mechanics experiment, obtained the preliminary rock bulk density, elastic modulus, Poisson's ratio, cohesion and internal friction angle of rock mechanical parameters. Then,according to the engineering practice and the Brown Hooke criterion, the rock mechanical parameters are corrected appropriately.(3) The stability of the typical stope is simulated with the parameters of the ore rock. Midas software is used to model to test schemes of different distances between pillars. Based on aspects such as displacement, stress, safety factor, plastic deformation,simulating and analysing on the surrounding rock mechanics response of schemes of pillar spaces for 4m×4m, 8m×8m, 12m×12m of the typical stope. The results concluded from the safety, economic and technical terms showthat 8m×8m scheme is the comprehensive optimal scheme.(4) The stability of the surrounding rock mass is verified. The parameters of the recommended scheme is verified by pillar strength formula, and the calculation result of pillar safety factor of target stope is larger than 1.5, which means the pillars stay in safe state. Three zones theory is applied to predict the safety mining depth, and the results show that the water flowing fractured zone of the stope will not lead to Quaternary aquifer. Safety verifications offer reference for the further safe and efficient development of the deposit. |
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