Nonlinear Mechanical Analysis Of Rock Mass And Early Warning Security System In Mine Slope

Contrasting with other artificial slope, open-pit mine slope are high height, complex geological conditions and constantly disturbance by excavation, so it is necessary to research their mechanical law and stability. On the basis of summing up the domestic and foreign research experiences of slope engineering, a classification method of rock mass quality that is adapted open-pit mine slope is put forward and a knowledge bank model of rock mass quality classification in mine slope is established. And then, an improving reliability algorithm that is adapted to mine slope engineering is obtained, and a stability evaluation system of mine slope is constructed. Moreover, the deformation laws of mine slope are revealed with the chaotic theory, and a security early warning system is worked up. The main contents are as follows:On the basis of summarizing the domestic and foreign achievements of rock mass quality classification, an evaluation system of rock mass quality in mine slope, which is contained the seven indicators of uniaxial compressive strength, RQD values, joint spacing, joint status, groundwater status, joint direction and earth stress, is established.According to the large amounts of domestic and foreign data in mine slope engineering, a knowledge bank model of neural network, which is embodied the relationship between rock mass quality and its influencing factors, is established, and the intelligent classification of rock mass quality is realized.Summing up the reliability method of the Monte Carlo simulation method, the statistical moment method, etc., a new method of reliability of mine slope is put forwarded by application of the Logistic Iterative Equation. The improving reliability algorithm can be obtained reliability index without the partial derivative of performance function, so the algorithm is simple and convenient programming.The slope stability of Youngtaowu, Shuilongshan and Xiyuan in Dexing Copper Mine are analyzed with the improved reliability algorithm based on Logistic Iterative Equation. The researching results show that the high safety factors of mine slope do not mean that the slope must be in stable state, and the stable slopes in weight condition do not mean that they are stable in considering the combination conditions of weight, blasting and saturated structural surface, at the same time, the stability of mine slopes are related with their reliability coefficients and the stress states.With the eight indicators of lithological features, sliding surface characteristics, sliding body size, mining intensity, blasting effect, back edge load, water erosion and equipment activities, the slope stability evaluation system is established, and according to unascertained measure and Fisher discriminant principle, an evaluation model of mine slope stability is obtained. Through an instance analysis of mine slope, the results show that the evaluation method has the character of low error rate and high accuracy.At Youngtaowu and Shijinyan slope in Dexing Copper Mine, the safety monitoring system of slope deformation in rock mass is set up with Multi-point displacement meters, and according to the monitoring data, the deformation law of mine slope is revealed with chaotic theory based on the reconstructed phase space.The security early warning system of mine slope is established according to the deformation characters of rock mass. The results of engineering application show that the safety early warning system of mine slope can enlarge deformation signal of rock mass through reconstructed phase space technology, and can well understand and analyze the deformation of mine slope, as well as can determine whether the slope is in warning region. Moreover, not only the slope stability can be predicted, but also the reasonableness of open-pit mining strength can be reflected, and the production safety is provided for open-pit mine.