| In the process of mining, the existence of groundwater is supposed to bring more harm than good which is not only the direct cause of increase in mining cost but also a threat to the safety of operating personnel and operating equipment.Due to its special geographical position of being surrounded by lakes on three sides, CMS copper mine is characterized by complex groundwater system and surface water system, which has brought much difficulty to solve its groundwater problem in mining. The water-sealing curtain grouting technology, which plays an important role in solving groundwater problem for many mines as an effective treatment technology, has been effectively utilized during the second phase of extension project of curtain grouting for CMS copper mine.In this paper, according to the construction and detection of the curtain grouting project in the two phase of the CMS copper mine, the effect of grouting is evaluated. In addition, this paper carries out research with the numerical simulation method on the east slope stability after curtain grouting project by choosing representative sections as research object and mainly do the following works:1.In-depth analysis of the regional geological structure,hydrogeological and engineering geological data and combined with the site,divided into districts main water-bearing rock and water rock group.2.Using grouting construction data analysis of drilling unit grouting quantity superimposition effect analysis, frequency curve analysis, discrete analysis and the analysis of the curves.found in the stack effect analysis II sequence hole unit grouting quantity than I order hole grouting quantity has the trend of decrease, illustrate sequence hole grouting hole grouting to I sequence II has played a supplementary role. Found in the frequency curve analysis II sequence hole grouting quantity I order the focus area was significantly decreased, which is the embodiment of the grouting effect is good. And in the discrete coefficient analysis with section II of the discrete coefficients sequence hole is smaller than I ordered hole, showed that after I sequence hole grouting, the main hole, fissure have been filled.3.Frequency selective use of natural electric field method respectively in the curtain of the north, south to examine geophysical exploration work,and comparing with the results preliminary controlling geophysical work,found that the main water curtain with the original channels have been blocked.4.By applying the method of inspection hole, validate the result of the construction data analysis and geophysical prospecting.Through the analysis of the core of inspection found that the hole slurry concretion filling is complete, filling rate is high; Inspection hole water pressure test also shows that the curtain water plugging effect is good.5.After grouting effects evaluation, according to the prophase of engineering geological conditions, using ANSYS to establish mine bring curtain before and after construction of the east slope model, and the two models by FLAC3 D numerical simulation, it is concluded that the shear stress distribution cloud plastic distinguish layout, shear strain increment cloud limit equilibrium condition. At the same time, by applying the method of strength reduction factor, it is concluded that the safety factor of slope,and compared calculation results. This paper concludes the impact of the grouting construction that there are no significant changes of safety coefficients of the second-level and third-level slope which are located far above phreatic level while the safety coefficient of the second-level slope increases significantly from 1.52 to 1.67, and the Security has improved significantly. |
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