Explosive blasting and breaking rock is the damaging effect of impact load on rock, and it is the result of the interaction between the pulsation stress wave and the quasi-static load of the explosive generated gas.
To study the physical and mechanical properties of rocks under explosive dynamic loads, the concept of wave dynamics must be used. The change of a local state parameter (such as speed, density, stress state, etc.) in the medium is called disturbance. The propagation of disturbance in the medium is called wave or wave. The interface between the disturbance zone and the non-disturbance zone is called wavefront, wave velocity. It refers to the propagation speed of the wave front.
Explosive blasting is a strong disturbance that produces blast waves that travel from near and far in the surrounding medium. The blast wave propagating in the rock mass can be divided into several different forms according to the magnitude of its waveform and state parameters.
In the vicinity of the explosion, due to the impact of high temperature and high pressure gas generated by explosive explosion, the rock is strongly compressed, and the high amplitude part of the compression wave propagates in the compressed medium, which has a high propagation speed, so that it can catch up with the compression wave front and mutual Superimposed, causing the state parameters of the rock to make a sudden jump, forming a strong discontinuity and propagating with ultrasound. Such a wave with a steep wavefront and propagating at a speed that exceeds the speed of sound in the medium is called a shock wave. Under the action of the explosion shock wave, the rock around the package is plastic and pulverized. The detonation wave propagating in explosives is a special form of shock wave that has a self-sustaining chemical reaction zone that continuously releases energy to ensure its stable propagation.
As the distance from the detonation wave increases, the energy of the explosion shock wave in the rock decays rapidly and is transformed into a gentle wave with a gentle waveform. In addition, when a low-power explosive is used to form a shock wave, a shock wave may not be formed. Directly form stress waves. The stress wave is the result of the stress generated by the dynamic load and the motion of the particle motion in the medium. It causes the rock to deform and destroy. The wave velocity of the stress wave is approximately equal to the speed of sound in the medium. The range of action in the rock is larger than the shock wave. many. therefore. Stress wave is an important problem blasting of rock crusher reasonable.
The stress wave continues to propagate and decay in the rock medium, and gradually transforms into a flexible seismic wave. The energy carried by the seismic wave is about 2 to 6% of the total energy of the explosive . However, due to its low frequency and long acting time, it often leads to structures and The main cause of vibration damage such as slopes.
The dynamic fracture properties of rocks are closely related to the effects of accommodative waves, shock waves, stress waves, seismic waves, and especially stress waves.
To study the physical and mechanical properties of rocks under explosive dynamic loads, the concept of wave dynamics must be used. The change of a local state parameter (such as speed, density, stress state, etc.) in the medium is called disturbance. The propagation of disturbance in the medium is called wave or wave. The interface between the disturbance zone and the non-disturbance zone is called wavefront, wave velocity. It refers to the propagation speed of the wave front.
Explosive blasting is a strong disturbance that produces blast waves that travel from near and far in the surrounding medium. The blast wave propagating in the rock mass can be divided into several different forms according to the magnitude of its waveform and state parameters.
In the vicinity of the explosion, due to the impact of high temperature and high pressure gas generated by explosive explosion, the rock is strongly compressed, and the high amplitude part of the compression wave propagates in the compressed medium, which has a high propagation speed, so that it can catch up with the compression wave front and mutual Superimposed, causing the state parameters of the rock to make a sudden jump, forming a strong discontinuity and propagating with ultrasound. Such a wave with a steep wavefront and propagating at a speed that exceeds the speed of sound in the medium is called a shock wave. Under the action of the explosion shock wave, the rock around the package is plastic and pulverized. The detonation wave propagating in explosives is a special form of shock wave that has a self-sustaining chemical reaction zone that continuously releases energy to ensure its stable propagation.
As the distance from the detonation wave increases, the energy of the explosion shock wave in the rock decays rapidly and is transformed into a gentle wave with a gentle waveform. In addition, when a low-power explosive is used to form a shock wave, a shock wave may not be formed. Directly form stress waves. The stress wave is the result of the stress generated by the dynamic load and the motion of the particle motion in the medium. It causes the rock to deform and destroy. The wave velocity of the stress wave is approximately equal to the speed of sound in the medium. The range of action in the rock is larger than the shock wave. many. therefore. Stress wave is an important problem blasting of rock crusher reasonable.
The stress wave continues to propagate and decay in the rock medium, and gradually transforms into a flexible seismic wave. The energy carried by the seismic wave is about 2 to 6% of the total energy of the explosive . However, due to its low frequency and long acting time, it often leads to structures and The main cause of vibration damage such as slopes.
The dynamic fracture properties of rocks are closely related to the effects of accommodative waves, shock waves, stress waves, seismic waves, and especially stress waves.
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