Study On The Stability Of Multi-level Rock Slope

With the western development strategy of our country, the municipal infrastructureconstruction such as railway, highway, water conservancy project and mine engineeringare building broadly. During this process, the project encountered in rock slope stabilityproblem would also increase relatively, especially in large open-pit slope performanceproblem is particularly prominent, for the special geographical conditions such as thewestern districts are hills and mountains and the formation weathering deeply. Therefore,the study on rock slope stability would be an important problem for the infrastructureconstruction and safety operation.Based on the mineral rock slope engineering theory, with the site investigation andexperimental analysis of rock mass parameters combined with gray theory andnumerical analysis techniques, this paper set up a rock slope stability analysis andtheoretical model. The model would lead to a more reasonable slope stabilityevaluation.The main content and conclusion are as follows:(1) site investigation: Through the site investigation and inspection, get theengineering geology and hydrogeology condition, know the slope of the rock massstructure, deformation and failure types and their geological model, and preliminaryanalysis of slope instability and impact failure mechanism of rock slope stability factors,lay a foundation for further study;(2) Experimental Analysis of rock mass parameters: It get the density, tensilestrength compressive strength, intensity parameters (cohesion stress and internalfriction), of the rock mass slope by the rock physical mechanical laboratory test andoutdoor test, these parameters are for rock slope stability analysis;(3) FLAC numerical simulation analysis: use finite difference FLAC procedurescarried out on the rock slope FLAC numerical simulation, showing that the slope themaximum shear stress is5Mpa, the level of maximum displacement is175mm and thevertical of maximum displacement is125mm, giving the stability of rock slope analysiscriteria;(4) Slope stability assessment: according to the actual slope situation, used AHPfuzzy evaluation method, classified and graded the index, established an analytichierarchy chart for slope stability evaluation analysis, proposed to improve the method for the problems of the essentiality concept in the AHP method, calculated the levelinstability of rock slope after improving fuzzy AHP evaluation model.(5) The slope stability prediction: based on judging the exponentially of slopedisplacement monitoring data, used the unequal time GM (1,1) of grey theory predictionmodel, proposed modified method to forecast the problems of slope displacementdeformation trend, and established an unequal Interval prediction model using dynamiccorrection Interval weight. the prediction accuracy is credible by comparing thepredicted curve analysis of the revised agreement is better with the measured curve.