Local Damage And Failure Analysis Of Multistage Slope Under The Action Of Mining And Blasting

By drilling and blasting method for mining of open-pit mine production, is currently the main way of opencast mining. The impact of frequent blasting,to promote the rapid expansion of the original micro crack coalescence, and induce new crack growth, and cause serious damage to the integrity of the surrounding rock structure. After blasting of rock mass with continuous mining, unloading effect on rock slope to local level, mining the different space position of each element within the domain of stress transfer, the original balance system was destroyed, and the rock mass displacement and deformation. At present, the blasting, slope under unloading local failure mechanism and early warning prevention and control technology research of mining, and the destruction of the disaster mechanism of action of mining and blasting, mining and blasting effect to local failure mechanism and failure process of multi-step slope is not clear, the systematic study of it is still the need to destroy mechanism of the interaction of mining and blasting under multi-stage slope failure process. Mining unloading effect is a long-term evolution and the blasting process is instantaneous, impact, how to choose the object of study of mining and blasting under the synergistic effect of multiple local failure of slope is the key to the problem. Based on the research object, how to develop the multi-level slope stability limit of the multistage slope prediction has important significance. In view of the above problems, characteristics of roof disaster in mine and its mechanism combined with the national natural fund project "(51234005-01)", the Ministry of housing and Urban-Rural Construction Science and technology project "city underground excavation disturbance of surface subsidence mechanism and engineering safety evaluation research"(2012- K3-21), group of Jinchuan Science and technology project of the Limited by Share Ltd quartz mine open-pit slope stability online remote monitoring and early warning system(B2-2012-092), analysis of the systematic stability and local multi slope under blastingFirst, the wireless remote monitoring and early warning system for real-time monitoring of the long-term mining and blasting effect of multistage slope internal displacement, the displacement field of multi-step slope extraction, using the Matlab polyfit function program, analysis of the displacement monitoring data, combined with the failure mode of slope displacement field, carries on the detailed elaboration to the multistage partial slope the failure process and failure mechanism of slope, the consequences of the damage, damage characteristic, disaster zone geometry, dynamic process. The displacement field of mining rock mass dynamic evolution and the macroscopic features, and the major factors that influence on mine high slope disaster and environmental qualitative rock association and disasters, further to mine multi-level slope local failure of qualitative classification and prevention measures.Second, the local stability of multi-step slope was analyzed by RFPA finite element strength reduction method, the strength reduction with the continuous mining, which overcomes the disadvantages of traditional simulation of continuous mining effect using single mining after the independence of the strength reduction method, makes the whole process simulation of real simulation results more close to mining. Reasonable.Third, the analysis of the field monitoring data under the blasting action, the damage accumulation of rock mass under the action of repeated blasting is analyzed. In blasting vibration wave under the action of multi-stage slope seismic amplification effect, first introduced slope shape effects on the amplification effect, establish the vibration wave under the action of vibration displacement formula combined with field data to verify.In this paper, the theoretical research and engineering practice, the improvement and development of the disaster mechanism research method of local damage of multi-step slope, combined with the failure process and failure characteristics to classify the local damage of multi-step slope, based on the real mining process modeling using RFPA to analyze the local damage, in-depth study of the catastrophe and catastrophe the mechanism of local damage, and compared with the real time monitoring in order to verify the rationality of further changes, the process of theoretical derivation.