Study Of Mine Underground Water Hazard Control Engineering Visualization And Surface Subsidence Prediction

Groundwater disaster and its derived ground collapse have undermined safety in mine. It's a threat to mine safety, geological environment and ecological balance. Therefore, research on groundwater numerical simulation, visualization of curtain grouting and ground collapse prediction is of great significance. The research will strongly support the effective management of groundwater disaster and ground collapse.Based on the research project——visualization of curtain grouting and numerical simulation for groundwater, the paper integrated use of groundwater simulation, three-dimensional computer modeling and artificial neural network, researches on Fankou lead-zinc mine with Visual Modflow, Surpac and Matlab. The main contents are as follows:(1) Conceptual model for hydrogeology numerical simulation of Fankou lead-zinc mine was built based on generalizing hydrogeological conditions in research area. According to this model, with the use of 3D groundwater simulation software——Visual Modflow, hydrogeology numerical simulation model of Fankou lead-zinc mine was built. By testing and verifying model parameters, the model was consistent with the actual situation of engineering.(2) With numerical simulation model of Fankou lead-zinc mine, the paper analyzed the law of groundwater flow field and the situation of regional water equilibrium, and then got the dynamic characteristics of groundwater. Though simulated and compared the change of groundwater flow field under various permeability coefficients and thickness of curtain wall after the second phase of curtain grouting, a set of correct permeability coefficients and thickness of curtain wall was determined. Then the groundwater flow field after the third phase of the curtain grouting was predicted, and the effect of curtain grouting in groundwater controlling was evaluated. It's the basis of visualization of curtain grouting and ground collapse prediction.(3) With three-dimensional visualization software Surpac, curtain grouting drilling database was established, which could realize the effective management and visualization of curtain grouting borehole data. The concept model of curtain wall, surface 3D model, dewatering and water storage 3D model were built. Therefore,3D visualization of curtain grouting was achieved. It's of great practical significance to carry out curtain grouting and greatly improve the ability of construction management.(4) Coupling with the actual situation of Fankou lead-zinc mine, the paper analyzed the mechanism of ground collapse, and identified main factors of ground collapse. These factors were quantified according to the extent of ground collapse.(5) Comprehensively analyzing historical data of ground collapse in Fankou lead-zinc mine, and summarizing the distribution-law of ground collapse in the research area. In order to provide early ground-collapse warning, ground collapse which occurred after the third phase of the curtain grouting was predicted by construct BP artificial neural network ground-collapse model. Then, the paper gave the measures to prevent and control ground collapse.