Blasting Load The Cumulative Effect Of The Creeping Slope And Stability

Along with the development of mine construction in China, the mining depth has increased and side slopes have become higher and steeper during the mining in large-sized surface mines. The stability and safety of the slopes are directly related to the mining safety of the surface mines. The production blasting is a kind of daily production activity, with the characteristic of repeatability, and the influence of its blasting dynamic loads on the slope is also repeatable, so it has a cumulative effect on the damage of slope rock mass from month to month. In this thesis the author summarized the progress of research on dynamic problems of rock slope after reading a large number of home and abroad documents. He found that most research focused on calculation methods of slope's dynamic stability and safety evaluation on slope stability, and little research had been done on dynamic load accumulation of slope blasting vibration. Therefore the author conducted a further and deeper study on the dynamic load cumulative destructive effect of blasting vibration on slope rock mass on the basis of projects of A Study on Reducing Vibration from Blasting in Xiaolongtan Open Coal Mine, Effect of Blasting Vibration on Slope Stability in Xiaolongtan Open Coal Mine and Effect of Blasting Vibration on Stability of Combined Body of Open Pit Slopes and Hillside Slopes.In this paper the writer described the transmission, energy, bandwidth and danger of blasting seismic waves after thoroughly analyzing the features of blasting seismic waves and dynamic mechanical properties of rock mass. He analyzed the blasting vibration signal collected on the field by utilizing Wavelet Packet Analysis and Hilbert-Huang Transform (HHT) and designed the realization process of these two algorithms. In addition, he also analyzed the general transmission features of blasting seismic waves. The author utilized MATLAB7.0 to edit relative programs for Wavelet Packet Analysis and Hilbert-Huang Transform (HHT), and decomposed and recomposed the original blasting vibration signals. The author obtained IMF component, instantaneous energy, marginal spectrum and energy spectrum.Analysis shows Xiaolongtan Buzhaoba pit blasting vibration energy is mainly distributed in the low frequency signal, generally in the 20Hz the following, when the center distance as the explosion energy will increase the high frequency signal loss, low frequency signal energy, especially low-frequency signals below 10Hz to become energy the main part, which is close to the natural frequency of the slope, easy to have a greater impact slope stability.After studying the home and abroad status quo and trend of research on creeping slopes, types and deformation of creeping slopes and space instability prediction, the author described the blasting vibration and its influence on Bu Zhaoba creeping slope, combining with the actual situation of Bu Zhaoba creeping slope in Xiaolongtan Open Coal Mine. The author utilized theories of rock dynamics, fracture mechanics and damage mechanics and SHPB as a test method to conduct a study on plastic damage cumulative effects of slope rocks under the action of quasi-dynamic impact. The author selected The FLAC3D powerful method to study the dynamic analysis of blast load on the Buzhaoba Xiaolongtan open pit slope stability, slope stability in the numerical calculation, the first time in the calculation of dynamic load input three-dimensional analysis of blast vibration waves and their effects on slope stability, and input vibration wave in one direction more than in line with engineering practice.