Study On Blasting Vibration Effects Of Underground Mining In Daye Iron Mine

Mineral resources played a decisive role in economic development in the country. The mineral requirements of resources is greatly enhanced with the accelerated pace of national development, national and medium-sized mining enterprises are using blasting technique, in this context, this explosion-generated vibration effect and may cause mine roof fall in the roadway and the Collapse generated, thus affecting the quality of the ore mining and the lives of miners, particularly in the ongoing cumulative impact of deep hole blasting is greater, therefore, studying the underground mining of the deep hole blasting with shock effects on the bodv of rock mining projects, particularly the cumulative effect of blasting vibration in deep hole, and then giving the method to lower the intensity of blasting vibration control effect of technical measures, ensuring that stability of underground roadway Wai rock, has important theoretical and practical significance to ensure that mine safety.Daye Iron Mine, used Sublevel Caving mining method and technology in deep hole blasting to off mine, in the underground mining process, there are also roadway above, there will have a large amount of pumice rock, dangerous rock and a lot of cracks after each time recovery of large blasting roadway, in order to ensure miner safety, they should charging through the treatment before the workers can approach, with the burst frequency increases, the risk is more and more obvious, this not only will cause the shadow on the heart miners, more importantly, a direct impact on productivity. If we can get the blasting mechanism on the roadway o particularly the cumulative effect of blasting, you can guarantee the stability of the roadway and the full recovery of mineral resources, also mine safety personnel. For these purposes, the paper, taken on-site blasting vibration testing and acoustic testing of tunnel surrounding rock in Daye Iron Mine, used a combination of theoretical analysis, including regress anaysis, BP neural network technology, FLAC3D numerical simulation of technical systems analysis of the deep Blasting Vibration Effects on the mechanism of roadway, especially try to study the cumulative growth under the law on the role of surrounding rock in the blasting damage, Then, the article use Grey relational analysis to adopted the associated factors levels of the effect of blasting vibration by Daye Iron Mine, and give measures to control Blasting Vibration Effects combined with the actual situation.The main research contents and results are as follows:1,The the blasting seismic wave attenuation analasys. First the article adopted in the actual production of blasting parameters, process the application and in the deep hole blasting vibration effects of roadway impact of the situation on-site investigation summary of Daye Iron Mine, we designed monitoring programs to monitor in order to study the deep hole blasting of the tunnel surrounding rock body intensity based of blasting vibration effect of blasting vibration, and give seven times the scene of blasting vibration test, get test point of blasting vibration velocity, vibration function of time, frequency of blasting vibration from shock and vibration effect of important parameters.According to Monitoring the results of blasting vibration frequency of main vibration frequency of statistical analysis and use of and several methods including monitoring software comes with each analysis module, mathematical software called EXCEL regression analysis and BP neural network to study the blasting seismic wave attenuation.we get the main vibration frequency is at 45～75Hz low frequency in Daye Iron Mine Blasting vibration after the study of Statistical analysis by the frequency, mining stope blasting vibration effects generated easily lead to tunnel surrounding rock body dynamic response; blast attenuation of seismic wave analysis showed that underground stope blasting and seismic wave produced in Daye Iron Mine Mining propagation is as the same as in hard rock blasting seismic wave propagation, in the line of the three methods by Daye Iron Mine Blasting vibration velocity was predicted by mathematical methods of BP neural network predictions and measured values of the minimum error, EXCEL second, monitoring software comes with the largest error analysis module.2,The cumulative effect of blasting vibration analasys based on acoustic velocity changes. based on field survey data, design acoustic testing program to study in the cumulative effect of blasting vibration through the tunnel surrounding rock to acoustic velocity changes, we field test site layout for each measuring point for five tests, we get field velocity about the underground mining surrounding rock after blasting mining, and based on these data study the cumulative effect of blasting vibration.With the increase in the number of blasting through the test point wave speed decreased, indicating the number of blasting, the influence of surrounding rock by blasting and the damage of surrounding rock increases, the integrity of rock decreased. The last time acoustic velocity decreased very large compared to the previous one, the interval with the last two times up to the fact that a large explosion and phase stability, but the numerical wave speed is not reduced several times in front of the simple sum of the value of velocity decreasing, but it shows a nonlinear relationship between the number of blasting,the damage value on local body based on speed of the rock sound is beyond the Dsw, the maximum of 0.32, shows many of rock has caused significant damage because of the blasting vibration.3,The cumulative effect of blasting vibration analasys based on dynamic stress rating. based on the theory of details Dynamic stress ratio, the article analysis of the dynamic stress ratio in the level of mining-84m 23#,26# and 29# mining roadway of the Daye Iron Mine, the horizontal direction in addition to a measuring third and fourth a test of dynamic stress about 1# point is greater than vertical direction, all the horizontal stress ratio is greater than the dynamic vertical direction in the other test, this law can explain that the vibration direction called by horizontal is a large impact of rock than vertical vibration in the Daye Iron Mine Blasting underground stope areas far from the level of vibration.4,The anumerical simulation of blasting vibration cumulative effects. the article selected section of 26# test points in -84m Acoustic roadway and got on-site monitoring of the particle blasting vibration velocity as the input load, established the calculation model according to the physical and mechanical properties of rock mass, used the software simulation with Flac3D simulated the principal stress, shear stress and plastic zone distribution after six consecutive burst around roadway Rock.The results show that the dynamic load applied continuously after the body of the main tunnel surrounding rock stress and the spatial distribution of shear stress change is not large, but their money increased in all non-linear trend, through the plastic zone analysis by continuous dynamic loading, the shear yield roadway presents a continuous increase of plastic zone, explaining that blasting vibration damage on the roadway of a cumulative process, from the second to the third burst dynamic load input, the shear yielding plastic zone size have a mutation, indicating the third input dynamic load of rock on the roadway the greatest impact, when the third blast vibration monitoring is used in the field of six tests in the largest one charge, blasting vibration Velocity is also the largest, consistent with the field test, the plastic zone of the primary health first come up in the surface from the surrounding rock, and then to the interior of the development of rock, and blast effects of seismic waves in both the first areas affected by excavation, which Description:The status quo conditions, rock mass damage by the blasting vibration effect on the mining project is not caused by an explosion, but mine blast in a large scale, multi-frequency case, the role of rock in the blasting vibration damage under the cumulative.The article compared the hree methods of blasting vibration cumulative damage results which based on sound velocity parameters and numerical simulation and the dynamic stress ratio,and gave the control measures to lower the vibration effect.