The Comprehensive Analysis And Valuation On The Inrush Risk And Grouting Design Of Complicated Iron Mine With Affluent Ground Water

Relying on the "the development and study on the crucial technology of exploring the complicated mine with large amount of water" (2006BAB02A01), one of the country's "eleventh five years" supporting scientific and technological items, the thesis has researched on the typical complicated iron mine of Bai Xiangshan and Gaoyang with affluent ground water. The content of the paper has involved the water inrush risk of iron mine. All these jobs have been studied from simplest to more complex and from the semiquantitative aspect to quantitative aspect gradually. The above research can provide the theoretical and practical help for prevention and control ground water oftwo iron mines. The detail as follows:1,The research on the partition of water-filled degree of mining area: Thewater-filled degree of mining area has been comprehensively evaluated by the mathematic tool of fuzzy. First, nine evaluation indexes have been chosen and given the weight by the Analytic Hierarchy Process and expert survey. Based on the related standard and the actual situation of iron mine, the clarified norm has been defined. Second, determine the assessment scope and mesh the base map, then the range of value has been divided into 1144 units. The evaluation matrix has been obtained through all the units given the actual value. Then, the membership of every unit has been calculated by the fuzzy comprehensive evaluation, determining the water-filled degree in the evaluation unit. Last, the results have also been analyzed, providing instructive advice for the following prevention and control of ground water, iron ore mining and tunneling in Gaoyang iron mine.2,The research on the partition of inrush risk of iron mine: On the basis of the study of water-filled degree, we have took full account of the influence of human factor, then evaluate the inrush risk by the mathematic tool of fuzzy. First, based on the nine evaluation indexes of the above evaluation, we added another seven indexs having big influence on the inrush risk, including the strength of surrounding rocks, the thickness of confiningbed and the five important parts of human factor and formed the assessment indicator system of iurush risk. The weight have been given by Analytic Hierarchy Process and expert survey. Based on the related standard and the actual situation of iron mine, the clarified norm has been defined. Second, determine the assessment scope and mesh the base map, then the range of value has been divided into 685 units. The evaluation matrix has been obtained through all the units given the actual value. Then, the membership of every unit has been calculated by the fuzzy comprehensive evaluation, determining the inrush risk degree in the evaluation unit. Last, the results have also been analyzed, providing numerical support for the following formulation of safety production plan.3,The numerical simulation on pre-grouting design of the water-transmissible fault: The finite element software ANSYS has been applied in this research. We have built several grouting model on the typical water-transmissible fault of Gaoyang iron mine and worked out the critical grouting thickness of the hydraulic pressure of 1MPa, 0.75MPa, 0.5MPa and 0.25MPa on the faults whose obliquity are 90,60 and 30 degree. By the collection and analysis of the results, we find the rule between the hydraulic pressure and the critical grouting thickness and find the changeable discipline of grouting thickness and the stress, displacement and plastic zone of model under the condition that the hydraulic pressure is varied. All these study can provide basis for pre-grouting design of this type of fault in the Gaoyang iron mine.