Abstract
The construction quality of tunnel smooth blasting is difficult to control and fluctuates greatly. Moreover, the existing technology, which relies on the visual observation, empirical judgment, and artificial control, has difficulty meeting the requirements of tunnel smooth blasting construction quality control. This paper presents the construction principle of a tunnel smooth blasting quality control system, introduces a process quality control technology into quality control of tunnel smooth blasting construction, designs a framework for the tunnel smooth blasting quality control system, and collects control index data based on field investigation, expert consultation, and experimental research. By using the methods of index utilization rate statistics, gray correlation analysis, and principal component analysis, this paper primarily elects and selects the control indexes; establishes the tunnel smooth blasting quality control index system; constructs a comprehensive optimization control model of tunnel smooth blasting quality using back propagation artificial neural network (BP-ANN), Elman neural network (ENN), and adaptive neuro fuzzy inference systems (ANFIS); and studies the tunnel smooth blasting quality control system. The following are the conclusions of this study: (1) This paper presented a method of constructing a tunnel smooth blasting quality control index system and established this system with seven criteria layers, namely, geological conditions, explosive properties, borehole parameters, charge parameters, method of initiation, tunnel parameters, and construction factors, as well as a total of nine indexes. (2) The comprehensive optimization control model of BP-ANN, ANFIS, and ENN for tunnel smooth blasting quality was established. (3) The uniform design method was used to optimize the blasting parameters of the tunnel section, which needs to be controlled, and verify that the construction of these comprehensive optimization control models can change the focus of tunnel smooth blasting quality control from the traditional single index control method into a dynamic, intelligent, pluralistic, and integrated control technology.
Highlights
Tunnel smooth blasting quality control is a general term in engineering practice in which the construction side of the employer, the construction side of the contractor, and other participating units identify, assess, and prevent all problems at all stages of the tunnel engineering blasting construction and control the whole process, work through the tunnel blasting construction through professional technology and construction management work, and obtain optimal economic benefits and safety guarantee with minimum engineering cost
In ensuring the construction quality of tunnel smooth blasting control, the existing technology, which relies on the method of visual observation, empirical judgment, and artificial control, has difficulty meeting the requirements of tunnel
The prediction results obtained by the comprehensive optimization control model are the tunnel smooth blasting quality index, which corresponds to the relevant level of each parameter
Summary
Tunnel smooth blasting quality control is a general term in engineering practice in which the construction side of the employer, the construction side of the contractor, and other participating units identify, assess, and prevent all problems at all stages of the tunnel engineering blasting construction and control the whole process, work through the tunnel blasting construction through professional technology and construction management work, and obtain optimal economic benefits and safety guarantee with minimum engineering cost. To ensure the quality of tunnel smooth blasting construction, the focus of quality control should change from the traditional single index control method to a dynamic, intelligent, pluralistic, and integrated control technology. Research on tunnel smooth blasting quality control in China has obtained productive results, such as the Railway Tunnel Construction Specifications, the Railway Tunnel Construction Technical Guide, and the Highway Tunnel Construction Technical Specifications. All these guidelines provide a control index for tunnel smooth blasting. The proposed control index does not form a system, the actual smooth blasting control process is greatly influenced by human subjectivity, and the accuracy and reliability of the control is poor. In accordance with the evaluation level of tunnel smooth blasting quality, tunnel smooth blasting parameters are optimized and adjusted, with the postcontrol of smooth blasting quality being changed to precontrol, which is beneficial to the construction side of the employer, the construction side of the contractor, and other participating units in formulating the appropriate control range for the key links of tunnel smooth blasting construction and to monitor and effectively control it in real time
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