| During the hydraulic mountain-adjacent tunnel blasting construction,the vibration caused by the blasting may have adverse effects on the adjacent side slope.To research and analysis in-depth is conducive to the prediction of blasting vibration and protection.The numerical simulation method was used to obtain the influence rule of hydraulic tunnel blasting vibration effect of adjacent slope,the influence rule of Jinfoshan diversion tunnel blasting on the left bank high slope were analyzed.The safety control method of hydraulic tunnel blasting vibration was put forward.The main results of this paper are as follows:(1)It was verified that load model of none blast holes has high practical performance under vibration regularity simulation of middle and distant fields.The blasting load of none and existing blast holes was applied to numerical example in vibration simulation.Then the calculation results and practicability of none and existing blast holes model was compared.(2)General vibration regular of blasting effect to adjacent slope in tunnel was found out.Through the blasting simulation of a certain slope,Stress wave spread rule and displacement variation regular were analyzed on the whole process of blasting.The schedule and slope surface variation regular of particle vibration velocity in different location with slope surface was found out.Based on blasting vibration formula with reflecting the altitude effect,the elevation amplification effect to slope was analyzed in the horizontal direction and vertical direction.(3)The vibration effect of slope under the conditions of different influence factors was analyzed,the influence rule of tunnel blasting on adjacent homogeneous and structural plane slope was found out.Considering the influence factors of tunnel location,surrounding rock level,section size of tunnel,shape of tunnel section and load of tunnel around the tunnel,the sensitivity of vibration velocity of slope in the blasting process was investigated.The relationship between the velocity of slope and the influence factors was obtained.The influence of the position of the tunnel on the particle velocity of the slope was discussed by regression analysis.The blasting vibration formula which reflects the height effect was verified.Considering the influence of hydraulic tunnel blasting on the surrounding rock slope,the sensitivityanalysis was carried out.Considering the influence factors such as the initial position of the structure,the structure of the surface,the thickness of the structure and the parameters of the filling material,the sensitivity of the vibration velocity of the slope in the blasting process was investigated.The effects of different factors on the vibration effect of the structural plane were found out.The mechanism of vibration wave propagation was discussed.(4)The vibration effect of the rock slope on the left bank was presented under the condition of the hydraulic tunnel blasting was investigated,the vibration influence of the two cracks on the vibration wave propagation was identified.The distribution of the vibration velocity of slope surface before and after treatment was compared.The difference between the vibration velocity of inner particle and the vibration velocity of outer particle was discussed.The location of monitoring points when blasting was suggested,the safety control method and the standard of the rock slope on the left bank was presented under the condition of the hydraulic tunnel blasting,Based on these investigations,the safety threshold of the slope was determined. |
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