Abstract
Blasting is an effective methods of tunnel excavation, but blasting vibration damage will occur in the construction process. In order to study the blasting vibration of the downlink tunnel, the blasting vibration of the upper part of a tunnel in yunnan was monitored The results show that the vertical vibration velocity is higher than the other two axial vibration velocity, and there is obvious elevation amplification effect in the blasting vibration propagation process. In this test condition, the impact range of blasting vibration is 22m, which will not affect the village. According to HHT analysis, the blasting vibration energy is mainly concentrated in the low-frequency interval, while the high frequency interval vibration energy is small; The instantaneous response spectrum of blasting vibration energy can reflect the number of detonators used for the maximum single-end charge, and there is a surge of energy in the process of blasting vibration energy transmission. At the same time, the expansion of the air face can effectively reduce the transfer of blasting vibration energy. The results show that the propagation of blasting vibration energy can be effectively controlled by controlling the maximum charge of explosive and increasing the blank surface.
Highlights
With the construction of expressways in northwest China, the interaction between expressways and villages becomes more and more common
According to the data in table 2, the blasting vibration velocity is distributed in the range of 0.024cm/s~0.095cm/s, and the vibration frequency is distributed in the range of 6.1hz~141.48hz
The blasting vibration velocity in the vertical direction is obviously higher than the particle vibration velocity in other directions, and there is an obvious elevation amplification effect in the vertical direction
Summary
With the construction of expressways in northwest China, the interaction between expressways and villages becomes more and more common. Using the theory of explosion dynamics and elastic wave, Lou xiaoming [2] constructed the calculation model of particle vibration velocity in the surrounding rock of differential blasting tunnel, and pointed out that distance, charge and time were the main influencing factors of blasting vibration. Yu jianxin [6] made a regression analysis of the blasting vibration velocity of the upper and lower cross tunnels, and obtained the Sadovsk formula of the peak vibration velocity through calculation By using this formula, the maximum charge weight of Cut hole and safety distance were obtained. The measured blasting vibration is analyzed by using Sadovsky analysis formula and Matlab to obtain the blasting vibration velocity prediction formula, blasting vibration influence distance critical value, and blasting vibration energy spectrum. In order to further analyze the impact of the blasting construction of downlink tunnel on the superstructure, the blasting vibration generated during the blasting construction of the upper steps is monitored and quantified
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