Study On Safety Control Standard Of Frequent Blasting For Residential Houses In Mountainous Areas

The propagation attenuation law of blasting vibration wave is very complicated.The attenuation mechanism of blasting vibration wave under the terrain of mountain area is explored,the control standard of safety vibration of damaged houses under frequent blasting conditions is studied,the vibration control standard and the attenuation law of blasting vibration wave under the mountain terrain are used to optimize the blasting design parameters and ensure the civil house.Safety and stability have important theoretical guiding significance and practical application value.In view of the above problems,this paper adopts the method of field test and numerical simulation to draw the following conclusions.(1)Multiple regression analysis is carried out on the measured data of blasting site,and the attenuation law of blasting vibration is obtained.By using the field attenuation law,the long-term monitoring data under the mountain terrain are statistically analyzed,and the correlation calculation is carried out,and the attenuation law of blasting vibration waves under the influence of elevation is obtained.(2)According to the numerical simulation analysis of the low layer masonry structure,the tension and pressure damage model of masonry structure is established,and the structural modal and damping are calculated.The dynamic response of the structure under the action of blasting vibration is numerically simulated.The amplitude of the measured blasting vibration velocity in the house is adjusted and the structure of the structure is obtained at different vibration velocity.The cumulative damage value and the masonry structure are most prone to damage position,and the cumulative damage model of civil houses under the action of blasting vibration is established,and the critical vibration velocity of 0 damage of masonry structure under the action of frequent blasting vibration is obtained.(3)The fracture mechanics of masonry structure with crack damage is analyzed.The relationship between stress intensity factor and fracture toughness is introduced.Through numerical simulation and field investigation,the most vulnerable part of masonry structure is found to be the corner of the gate.With the introduction of the extended finite element(XFEM)module,a simplified numerical model is established for a crack which is most likely to have a different prefabrication length.The critical stress intensity factor is calculated by XFEM.The maximum stress intensity factor of crack with different length under different vibration speed is calculated.and the maximum stress intensity factor and peak value are obtained.The relationship between the vibration speed and the critical stress intensity factor is used to solve the vibration velocity of crack initiation at different lengths.According to the vibration control standard of the damaged house and the attenuation law of the vibration velocity under the mountain terrain,the blasting design parameters are optimized and the blasting excavation parameters are dynamically adjusted to achieve the purpose of improving the construction efficiency and ensuring the safety and stability of the houses.