## 2 Construction of Intelligent Automatic Blasting Vibration Monitoring System
### Neural Network Model Based on the Fuzzy-Rough Set
If the installation position is outdoors, we use solar panels and batteries to supply power. The remote computer in the background control is used to set the relevant parameters and start the acquisition mode, and then the instrument is put into the working state. When the blasting vibration signal is transmitted, the dynamic waveform is transformed into digital signal and transmitted to the server. The users can transmit data to local display, conduct operation analysis and blasting vibration data processing through terminal software, and monitor the working state of the system in real-time. Based on the construction situation of each site, the formation attenuation effect [20], hollow effect [21], and high-rise building amplification effect of blasting vibration propagation law were under consideration [22]. The maximum quantities for the detonating period, total quantity for detonating period, horizontal distance, vertical distance, the shortest distance from packet to the free surface, differential time, the integrity of excavated and unexcavated layer, transmission medium, and types of explosive were selected as the condition attributes (a-i). Peak velocity of vibration was in X direction, peak velocity of vibration was in Y direction, peak velocity of vibration was in Z direction and master frequency were taken as decision properties (X, Y, Z, F). The Slowinski (S method) method is relatively simple and can be divided into non-overlapping intervals according to the distribution characteristics of data, which has a small amount of calculation and reduces the calculation workload. One-hundred groups of measured data were selected and discretized to make a reduction according to the rules in Table 2 [23; 24], with the Slowinski method (S method). According to the rough set theory, the sensitivity or dependence of the decision on the conditional attribute and the blasting vibration parameters' sensitivity to the blasting conditions can be reflected with the discordant rate. The dissonance rate of the conditional attribute \(C_{i}\) can be expressed as  
\[N_{Ci}=UH|C-\{C_{i}\}|/|W| \tag{5}\]  
where \(C\) is the conditional attribute: \(C=\{C_{1},C_{2},\ldots,C_{n}\}\); \(W\) is the field: \(W=\{A_{1},A_{2}\ldots,A_{k}\}\); \(A_{i}\in W\), \(I=1,2,\ldots,k\). \(C-\{C_{i}\}\) is to remove attribute \(C_{i}\) from conditional attribute; \(UH|C-\{C_{i}\}|\) is the uncoordinated cardinality; and \(|W|\) is the base. With Equation (4), the blasting vibration data of R station, Y station, and H station of an individual line of Qingdao metro are selected to calculate each factor's discordance rate, as shown in Table 3.  
It can be seen from Table 3 that the coordination between decision conditions and attribute conditions is different under different sites, which means that blasting vibration parameters have different sensitivities to various control factors. As for the vibration velocity of peak particle, the uncoordinated rate of each influencing factor is c > a > d > b = e = i > f = h. It can be concluded that the horizontal straight-line distance between the explosion source and the monitoring point has the greatest influence on it. The secondary influencing factors are section charge, total charge, and elevation difference. The size of the resistance line has relatively little influence on the rock integrity coefficient, while the time of slight difference of blasting and the medium condition of propagation site have the least influence. For the dominant frequency of blasting vibration, the uncoordinated rate of all factors is c > d = i > a = g > e > b = f = h. It can be concluded that the horizontal straight-line distance between the explosion source and the monitoring point has the greatest influence on it; the secondary influencing factors are elevation difference and explosive type, the segment charge and rock integrity coefficient have relatively little influence; while the total charge, the time of slight difference of blasting, and the medium condition of the propagation site have the least influence on it.