| With the rapid development of China’s economic construction, mining resourcesexploitation as one of the pillar industries of the national economy has also beengrowing rapidly. A large number of Waste Slopes are generated by mining production,there may be some geological disasters such as landslides debris flows, bringing greatharm to life and property of the people, and the near destruction of mine theenvironment, so the waste dump slope has a great practical engineering significance.In this thesis, Taking "the limestone mine expansion waste dump of Lafaji CementCo. of Dujiangyan " project as the basis, select the waste dump slope as the researchobject, its based on the study of engineering geological investigation of environmentalconditions,to determine the deformation and failure modes of the dump slope, andusing numerical simulation such as limit equilibrium method and finite differencemethod to to study slope stability and stress-strain characteristics with the dump heapload process. Specific contents and main results are as follows:（1）Shenxigou waste dump is located northwest side of the open limestone pit,According to the original topography and waste dump spoil characterization andengineering analogy think, Spoil slope should be stepped. design a step every tenmeters, Slope ratio of1:2.5, and by hierarchical way of rolling slag heap.（2）The Longmen Shan Yingxiu fault zone through from waste dump near theleading edge,5.12earthquake it is obviously active at the leading edge waste dump,waste dump area frequent rainstorms, high rainfall intensity, peak concentration,earthquakes and storms will have an important impact on the slope stability wastedump.（3）The waste dump stability factor is calculated with the following rules: thestability factor under various conditions is decreased with increasing number of layers;the natural conditions, the stability factor to seven layers is stable, piled high to8-10in critical stable state, then piled high to11-12layers in an unstable state; under saturated conditions, in addition to two layer the heap six layers of waste dump are instable condition, and the rest are in an unstable state; under earthquake workingcondition, which stability is basically the same with the slope stability in stormconditions, only in the numerical stability coefficient slightly different, but for theearthquake+rainstorm working conditions, the stability is the lowest only stack in thefirst, third, and six in a stable state and the other are in an unstable state.（4）According to the analysis result for this slag heap waste dump thestress-strain characteristics and slope failure, on the whole slope in the waste dumpthe deformation of each elevation slope is larger with increasing heap load of storeys.both the distribution and the plastic deformation zone displacement values, theincremental value of shear strain, the shear strain increment bands in the region areincreasing, but plastic zone is only a partial destruction of a few plastic and stillintermittent discontinuous distribution inside slope in the un storm+earthquakeconditions, but in the storm+earthquake working conditions its plastic zone throughslope almostly, it is highly likely unstable failure.（5）The long-term cumulative of Yingxiu fault deformation may affect wastedump slope stability, it is necessary to set up at least three monitoring points formonitoring deformation on the surface and slope displacement of the site, in order toprovide the basis for governance and management measures in the future. |
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