| With the shortage of Metallic mineral resources having become the bottleneck of nation's economic development, the ground-water problem of mine has turned into the crucial point of restricting the exploration of metal mineral resources security. Relying on the "the development and study on the crucial technology of exploring the complicated mine with large amount of water", one of the country's "eleventh five years" supporting scientific and technological items, the thesis has researched on the typical complicated iron mine of Gaoyang with affluent ground water. The content of the paper has involved the hydrological geology condition of mine area, the water inrush risk of iron mine and the groundwater's influence on the stability of wall rock. All these jobs have been analyzed from the whole to the part with systemic point and studied from the qualitative aspect to quantitative aspect gradually. The above research can provide the theoretical and practical help for liberating the iron mine of -285m water level and prevention and control ground water of Gaoyang iron mine. The detail as follows:1,The qualitative research on the hydrological geology condition of mine area: The hydrological geology condition of Zibo basin, where the Gaoyang iron mine lies in, has been analyzed by the systemic theory. Based on the geology and hydrology of mine area having been sufficiently understood and analyzed, the Zibo basin is divided into three grades: the first grade of hydrological geology unit of Zibo basin, the second grade of hydrological geology unit of Jinling iron mine and the third grade of hydrological geology unit of Gaoyang iron mine. At the beginning, the boundary condition and the movement laws of groundwater's supply, run-off and discharge of every unit have been probed. Additionally, the relationship of every unit and the connection among them, have been analyzed with the systemic theory, such as unity, structural character, hierarchy nature and openness character. At last, some suggestions about the problem of groundwater prevention and control have been proposed, also led by the systemic theory, and the groundwater' resource and movement laws of Gaoyang iron mine have been mainly found out. 2,The half quantitative research on inrush risk of iron mine ground water:The ground water inrush risk of Gaoyang iron mine in the ore body area has been comprehensively evaluated by the mathematic tool of fuzzy. First, sixteen evaluation indexes have been chosen and given the weight by the experts on ground water aspect. Combined by the actual situation of iron mine, the clarified norm has been defined. Second, the region of iron mine has been divided into seven units, based on having been analyzed the practical condition of laneway and the distribution of them. The evaluation matrix has been obtained through all the units given the actual value. Last, the membership of every unit has been calculated by the fuzzy comprehensive evaluation, determining the risk degree of groundwater in the evaluation unit. Through all the above work, two units with high risk of ground water inrush, two units with moderate high risk of groundwater inrush, one unit with medium risk of groundwater inrush and two units with weak risk of groundwater inrush have been confirmed and these 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.3,The quantitative research on the stability of laneway wall rock: The finite element software ANSYS has been applied to simulate three dimension modal of affection between groundwater and rock numerically. The simulation lies in the influence and changeable discipline of the stress, strain and stability, which the groundwater has acted on the wall rock in the number seven laneway, one of high inrush risk regions. In the first place, the geological modal has been built through having thoroughly analyzed the geological situation of number seven laneway, and the numerical modal has been constructed by means of abstraction and generalization of former one. Afterwards, the results of the modal have been calculated by the software of ANSYS, on the base of the defined parameters of wall rock and soften areas affected by the groundwater on the rock. At last, the distribution and changeable discipline of wall rock's displacement, stress, strain, elastic strain and plastic strain have been analyzed on the situation of consideration and un-consideration of coupling between groundwater and rock, and on the circumstance of influence by the groundwater in five hydraulic pressures, including 0 meter, 12.5 meters, 30.5e meters, 75.5 meters and 106.5 meters. In the end, the stability of wall rock has been evaluated. All these study can provide numerical support for the grunting mortar and formulating thickness of jamb for preventing ground water breakthrough in the Gaoyang iron mine's next project.Besides the above research and study, some cognitions have been gained, as follows:1,The relation curves among time, water inflow and pressure have been gotten through dealing with the water drainage experiment data of Gaoyang iron mine in nearly one half year. The changeable discipline of relation curve has been analyzed by the basic theory of groundwater dynamics. The calculation formula of water inflow has been chosen appropriately, aiming at tangling the problem of karst limestone water. The function relationship between water inflow and water level has been confirmed, in the premise that the parameters of the formula had been counted by the method of Minimum Square. The value of water inflow, along with different water levels has been forecasted preliminarily.2,In the basis of understanding the data of former water pump test and water drainage experiment, the relationship between maximum value of slack water and the displacement of groundwater, has been compared to analyze the continuity of Yuhangshan fault in the third grade hydrological geology unit of Gaoyang iron mine area. The fault has been proved to be a continuity one in the iron mine region.3,Led by the basic theory of inrush condition of mine area, the inrush situation of Gaoyang iron mine has been deeply analyzed. The type of Gaoyang iron mine has been defined to be a hydrological geology complicated one, with the one of wall rock being bedded karst water carrier, the other karst confining bed. |
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