| Mineral resources are playing an important basis role in social development because they are necessary material conditions to human beings. In recent years, with mineral resources exploitation strength increasing, the damages from mine geology environment were getting worse and worse. So mine geology environment and concomitant geohazard have become heavy geoenvironment issues limiting mine development in our country. The thesis was focused on Huanying Mining Area, and studied the relevant issues on the environment harnessing of mine. Following conclusions were drawn:(1) According to character of underground mining, the interaction mechanism analysis method and the prevention and cure technique are advanced, which can afford fine theoretical methods for environment geological problem analysis of similar mines.(2) The influence of underground mining on the drainage of underground water is the key factor inducing the geologic issues on water environment. The influence rule of underground mining on the drainage of underground water was studied based on the fact example from Liziya Mining Area.â‘ Make to calculate the sparse dry area of the underground water in the mining area, using underground water runoff modulus and the drainage of underground waterl. the method can calculate and appraise the sparse dry area of the underground water that caused by the extraction efficiently. Validated by the examples, the results have better consistency with the field test.â‘¡Make to forecast the development law of the drainage funnel of underground water ,using grey systematic GM( 1,1) model and time sequence AR( p) model. Which establish the foundation to appraise the development law of the vertical underground water that caused by the mining extraction.â‘¢Get the development law of the shaft flood water. The shaft flood water is measured increase progressively year by year with time, but the increased range slow down year by year. The drainage of shaft water changes gradually from the flood of aquifer that builds well in the initial stage to the impregnation water in the aquifer supplied by the precipitation, the size of drainage quantity depends on the precipitation supply of the underground aquifer of this district.(3) The reason of the 10.4 sudden flood water accident in Longtan Coal Mining Area was analyzed systematically. Find out the sudden flood water site locates in the distribution section of thick layer of lime rock in Changxing group, this rock has the more strong solubility and more rapid corrosion speed. Disturbed by the stress nearly east to west which extrude the knee form structure, accompany to produce plenty of longitudinal cracks and cavities caused by the extraction between layer; At the same time, the lime rock of Changxing group grow in absolute altitude 900m to 1000m in the north of the mining area, which is helpful for precipitation to impregnate; Bring up the unique advantage of karst underground water department and karst space development, form a huge water store space in the karst area. Disturbed by the excavation, separating water rock mass become to break bodily, which offers passageway for sudden flood water.(4) Based on the analysis of underground water power balanced condition and the 3-stage of sudden flood water of the original shaft, make the 4-stage theories of sudden flood water course. This theory offers basis to provide correct options that relieve disaster of the sudden flood water in mining area, then guarantee to rescue or the safety surveying work. At the same time, using numerical simulated technology, imitate and analysis the development of seepage field of underground water in the shaft after excavation, and dynamically analysis the interaction of the underground water and the mining excavation in the mining area. Put forward the measures of avoidance, drainage and jam, and related supplemental methods, and the reasonable prevention methods of sudden flood water of the shaft, which are based on the hydrogeology condition in the mining area.(5) Through the actual data analysis of the surface deformation of the green-water mine ,we take the deformation law about the main face of mined-out area ,and get the control parameters of the surface deformation . On this basis, using probability integration can calculate subsidence region of mined-out area, laid the foundation for the dispose of the surface subsidence disasters in underground mining.(6) Through the study of the disaster formation mechanism and the stability about the green water-waste dumping site, we take out the corresponding control measures, which provide a method to deal with the geological environment problem of the dumping site. The results are as follows:â‘ Using the FLAC3D we established a numerical model about the accumulation, and simulating the deformation characteristics of the accumulation in different conditions, and find out the most likely potential slide area. Sliding surface for nearly arc in the central of dumping site, fracturing at the back of the margin and the central sliding along the clay layer shear out in front foot of dumping site in the above. The deformation of surface from the surface to the sliding area gradually decreased (distribution as belt), the direction of displacement parallel with the slope , deflecting at the front of shear export.â‘¡Applying the limited equilibrium theory, and making the quantitative analysis of the stability about dumping site .Found stable situation of the accumulation of waste in different conditions as: natural condition, natural condition with rainstorm, and natural condition& rainstorm & earthquake, and so on. The results show that: in natural condition ,the head of the slope exists partial instability in large-scale, especially in the influence of rainstorm the stability of the slope may decreased and the quantity of instability may substantial increased, which may create conditions for the mud-rock flow.â‘¢On the basic of stability analysis and numerical model, we take out a general governance project about the dumping site with "Fender & Surface drainage & Slope cutting & Slope surface protection", and the results show that after the implementation of the measures, slope stability become better and achieved our design requirements. |
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