| Slope Engineering has always been the focus topic of scientific research workers,landslips and collapses caused by slope failure tends to cause huge losses to industrialand agricultural production, people’s lives and property. Open pit mining slope has beena typical slope engineering problem, recently, it causes increasingly serious problems inthe geotechnical engineering. Slope stability analysis and evaluation is the core issue, anaccurate evaluation and forecasting of the slope stability situation and developmenttendency can provide a reliable basis for the work of prevention and treatment of theslope.In this thesis, Jingdong Mine Industry Square West Slope Engineering was studied,through the analysis of geological data and the field environment, slope hazards wasanalyzed. Firstly, the natural geographical conditions and geological features of open pitslope was fully studied. And then, combined with theoretical analysis, numericalexperiments, GIS spatial analysis and visualization technique, the slope stability undernatural conditions and its control measures was studied. Five sections were includedspecifically as follows:（1）The software SLIDE5.0was used to analyze the strength stability of the slope.Based on slope inclination and direction, the overall stability of the slope conditions anddrilling distribution,6characteristic sections were selected, and the calculation modelswere established by software SLIDE5.0. Combined with the indoor mechanicalexperiments of the slope rock samples, and applying positive analysis method, thephysical and mechanical parameters for calculation were determined. The strengthstability analysis method incudes simplified Bishop method, simplifies briefing Francemethod, Spencer method and Morgenstern-Pula Oxley method. Comparing the resultsgot from these four methods, the stability factor are around1, which can not meet theengineering requirements.（2）The numerical simulation software FLAC-3D was used to analyze thedeformation stability. A FLAC-3D geological model was established to simulate the development of open pit slope deformation characteristics. In addition, the influence ofunderground mining was studied, with9#coal mining, open pit slope acts meanly asfollows: subsidence deformation happens in the middle and upper part of the slope, thedisplacement vector points to mined-out area, the lower portion of the slope actstowards to the free surface, under the compression provided by the upper and the rearpart of slope deformation, it deforms to the open pit. With9#coal mining continues, itwill have further impact on the slope deformation and force, and the maximumdeformation magnitude and the affected areas will grows with different degrees.（3）GIS was adopted to distinguishing the stability level regionalization. By theGIS, a3D geological model and concerning basic database was established, combinedwith the strength and deformation of slope stability analysis, the main factors affectingslope stability were analyzed. Taking the slope inclination, elevation, geology lithology,water, geological structure as the evaluation factor, an evaluation index system of thestudy area was established. Through Analytic Hierarchy Process, the slope stability wasdescribed from qualitative features into quantitative data. The Model Builder tool inArcGIS can create stability model class divisions for high steep open pit slop. Thestability of the region was divided into four levels, and forming the slope stability levelzonation map. After the stability level analysis, combined with slope engineeringgeological map, several key factors affecting on the slope was analyzed in GIS: themain sliding direction, the slope runoff, and slope cracks buffer.（4）Acomprehensive monitoring program of sliding force and displacement wasstudied. Sliding force monitoring uses the "landslide hazard remote intelligentmonitoring system", which includes monitoring, early warning and reinforcement part,while the displacement monitoring is based on the FLAC-3D deformation analysis andGIS stability of regional studies. Based on the slope displacement monitoring designprinciples, a displacement monitoring network was established,which uses Leica TotalStation to get three-dimensional coordinates of the monitoring points regularly. Theresults of data processing of the sliding force and displacement indicate that when theslope adopts monitoring reinforcement, the maximum sliding force changes in volumeof not more than20kN per month, which confirms the remote monitoring system works well in Jingdong Open Pit Slope. Meanwhile, according to the displacement-timecurve, the change is very small at recent stage, which indicates that the slope is in steadystate.（5）Based on GIS data processing and visualization techniques,the visualizationmethod of sliding force data and displacement data were researched. The monitoringdata adopts the distance inverse interpolation method to analyze, and then regionalmonitoring data can be visualized. Overlapping display of the visualization results andthree-dimensional geological model, it makes the monitoring data to achieve a spatialvisualization. This can intuitively show the dynamic stability conditions of the slope,and play a monitoring and early warning role. |
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