This paper aims to explore the development of a risk management system for engineering blasting to achieve systematic management of quality, safety, environmental, and occupational health risks throughout the entire life cycle, encompassing all aspects and elements of blasting activities. Based on the establishment of comprehensive safety and environmental awareness, it advocates the use of systems engineering methodology to analyze risks in the field of engineering blasting in depth. The article follows the internationally accepted ISO 9001(Quality Management System), ISO 45001(Occupational Health and Safety Management System), and ISO 14001(Environmental Management System) standards, and constructs a scientific risk management framework. It is proposed to combine technical means, such as standards, metrology, inspection and testing, certification, and accreditation, with a risk management model for engineering blasting systems based on the PDCA (PLAN-DO-CHECK-ACT) cycle. This model emphasizes prevention as its primary focus, and through improvement, it ensures that risks are within a controllable range. The article further introduces digital twin technology, and constructs the engineering blasting B-NQI (B-NQI risk-based digital integration of engineering blasting quality, safety, environment and occupational health) system, which realizes real-time monitoring, prediction, control and decision of risk information, greatly improving the efficiency and accuracy of risk management of engineering blasting system. The research not only enriches the theoretical framework of engineering blasting risk management but also provides practical tools and methods for industry applications. Constructing the B-NQI system helps reduce various risks in the engineering blasting process, ensures project progress, and provides strong protection for worker safety and environmental protection.

Taking the Dengjiashan aggregate mine in Jiangxi Province as the research object, an optimization mechanism and engineering application of air deck charge blasting technology on the powder ore rate was systematically explored in this paper. Firstly, the engineering geological conditions of the mine were analyzed, including the rock mass characteristics and the distribution and development of joints and fissures. This assessment provided a foundation for subsequent blasting test research. Secondly, this research introduced a theoretical framework of air-decking charging and proposed a blasting method utilizing air decks. The mechanism of air-decking charging emphasizes its role in attenuating explosion stress waves, prolonging explosive gas expansion duration, and optimizing energy distribution. Furthermore, this study systematically investigated the influence of different air-decking configurations (top, middle, and bottom placement) on the powder factor. Then, experimental studies and data analysis can validate the method's reliability, culminating in its successful application in field-scale engineering. Thirdly, blasting parameter optimization was carried out using the air deck blasting method based on experimental data, focusing on explosive consumption and inter-hole delay time as key variables. A parameter optimization regression model was subsequently developed (R²=0.8697) to enhance blasting efficiency, demonstrating strong predictive reliability through experimental validation.

In recent years, the technology of controlled fracture blasting with sequential timing has been extensively utilized in the construction of mining engineering projects and hydraulic infrastructures. To investigate its influence on crack propagation mechanisms in rock masses, C50-grade concrete specimens with 3, 5, and 9 boreholes were cast. Detonators were used instead of explosives to conduct multi-hole blasting tests on rock-like models, examining the propagation paths of cracks and the effects of fracture formation. The LS-DYNA software was used to simulate blasting processes under various working conditions, utilizing the RHT constitutive model to characterize the dynamic failure behavior of rock. A fluid-solid coupling algorithm was employed to simulate the interaction between explosive stress waves and rock masses. By regulating variables such as borehole spacing and detonation timing, several numerical models were developed. Post-processing software was used to extract the simulation results, which were subsequently compared with experimental data to investigate crack propagation patterns within rock masses. The results indicated that time-sequenced controlled blasting technology effectively guides cracks to propagate along predetermined paths. Both the detonation timing sequence and borehole spacing significantly influence crack formation, with more pronounced effects observed in configurations containing a greater number of boreholes. Rational design of initiation timing and borehole spacing can substantially enhance the efficiency of explosive energy utilization while reducing damage to the surrounding rock. This study provides theoretical foundations and technical support for precision blasting operations in complex geological conditions.

The design of the tunnel blasting course is an important comprehensive practical teaching link of the "Blasting Engineering" course of related majors in colleges and universities. To explore new ideas for reforming teaching practice, given the challenges of complex calculations, difficult parameter selection, and cumbersome diagram drawing in traditional curriculum design, a tunnel blasting intelligent design software platform was proposed for course design. By integrating digital and intelligent design technologies, the authors develop an intelligent design platform that converts abstract blasting parameter design into a clear visual model. The platform includes four modules: blasting design, resource library, data management, and global settings. It innovatively realizes real-time modification of blasting parameters and implementability judgment, has a guided operation process, and forms an interactive teaching mode. The practical results demonstrate that the intelligent design platform effectively reduces the computational burden and the subjectivity of parameter selection for students in traditional teaching practices through the guided operation process, enhances drawing efficiency and accuracy, and ensures that the blasting design scheme is scientifically and reasonably formulated. The interactive teaching mode enhances students' ability to combine theory and practice, stimulates their interest in active learning, thereby improving their understanding of professional knowledge, cultivating intelligent design ideas, and providing support for becoming high-quality talents serving the new era.

In order to improve the effectiveness of mining roadway blasting excavation and reduce the damage of blasting vibration, the method combined field blasting tests, blasting vibration monitoring tests, and numerical simulation analysis was adopted. The allocation of actual holes and vacant holes was determined according to the utilization rate of the blasting hole. The reasonable delay time was determined based on the peak of particle vibration velocity. At the same time, a numerical model was established based on the size of the roadway and the physical and mechanical properties of both the roadway and the surrounding rock. Based on the material parameters, the impact of roadway blasting excavation on the surrounding rock structure was analyzed using ANSYS/LS-DYNA numerical simulation software. The research findings demonstrate that employing the layout method of central real holes coupled with surrounding empty holes for roadway blasting excavation results in a utilization rate of cut holes exceeding 96%, with the highest utilization rate reaching 97.9%. This indicates that the strategic arrangement of real and empty holes can significantly enhance the efficiency of blasting excavation. Besides, when the delay time increased from 50 ms to 75 ms, the attenuation rate of the peak of particle vibration velocity exceeded 20% at the same position. When the delay time was 100 ms, the peak particle vibration velocity decreased to 2.97 cm/s at 25 m, indicating that the delay time can significantly reduce the damage caused by blasting vibration. Meanwhile, when the layout of central real holes and surrounding empty holes with a delay time of 100 ms was employed to analyze the surrounding rock structure during roadway blasting excavation through numerical simulation, it was observed that a tensile stress of 9.1 MPa was generated at the arch crown position within a 1-meter range from the roadway section. Tensile stress greater than 5 MPa was present at the arch waist position within a range of 1 to 4 m. Therefore, it is recommended to add steel frame support to the arch crown position and spray concrete on the arch waist position.

Accurate and efficient explosive detection technologies facilitate real-time monitoring of blasting materials throughout their storage, transportation, and usage, enabling the prompt identification of expired or unstable explosives. Furthermore, trace detection methods can detect residues of illegal explosives, offering technical support for safety supervision and public security, while striking a balance between engineering efficiency and environmental safety. This study introduces an optical fiber Raman sensor utilizing silver nanoclusters (AgNCs) for the explosive detection of explosives. By integrating Raman spectroscopy with fiber-optic sensing technology, it achieves highly sensitive spectral detection and efficient signal transmission specifically for TNT detection. The AgNCs substrate, modified with silver-sulfur bonds and functionalized with 4-ATP, acts as a capture probe for TNT. The formation of the TNT-4-ATP complex significantly amplifies the SERS signal of TNT, resulting in a detection limit (LOD) as low as 10^-10 M.

The study aims to investigate the explosion characteristics of methane/air premixed gas across various temperatures and ignition positions. Under winter and summer conditions, respectively, using a custom-designed methane/air premixed gas explosion test apparatus, tests are conducted with different aspect ratios for a variety of concentrations of methane/air premixed gas explosion test, systematically analyzes the influence of temperature, aspect ratio, and concentration of the premixed gas explosion on the overpressure peak and impulse characteristics of explosions. Furthermore, by utilizing magnitude analysis methods and data fitting techniques, the study identifies the primary factors influencing these overpressure peak and impulse characteristics, and proposes a corresponding approach. In conjunction with the process of magnitude analysis and data fitting, the main factors affecting the overpressure peak and impulse characteristics were systematically analyzed, leading to the development of prediction formulas for the overpressure peak and impulse of methane/air premixed gases. The results indicate that: (1) the trends of peak overpressure and impulse in relation to increasing L/D ratio are generally similar for a specific gas concentration. However, these trends differ between winter and summer temperatures. Specifically, at a gas concentration of 7.5%, both peak overpressure and impulse initially decreased, then increased, and subsequently decreased again under winter temperature conditions, while they continued to decline under summer temperatures. For gas concentrations of 9.5%, 11.5%, and 13.5%, both peak overpressure and impulse consistently showed a decline in both winter and summer temperature conditions. (2) The relationship equations for peak overpressure and impulse, concerning the L/D ratio and methane/air premixed concentration, were established using magnitude analysis and data fitting under winter temperature conditions. The theoretical data were compared with the experimental results to verify that the errors were within 15%. The overall data match well, which verifies its reliability, and can express the decay law of overpressure and impulse with the L/D ratio and gas concentration more intuitively, thereby facilitating the rapid prediction of overpressure peaks and impulses.

With the increasing complexity of the urban environment and environmental awareness of the public, directional toppling blasting demolition of frame structure buildings often encounters the problems of large collapse recoil distance and strong ground impact vibration, which limits the development and application of blasting demolition technology. To control the collapse recoil and touchdown vibration of the directional blasting demolition of the frame structure building, the design method of the hinge point forward high blasting cutting was put forward, and the theoretical calculation model of blasting cutting height was established based on traditional bottom cutting blasting demolition technology. Meanwhile, a blasting demolition technology of high-cutting blasting with a reserved buffer layer was developed combined with engineering practice. Three kinds of blasting cutting forms were designed to meet the control requirements of different degrees of collapse recoil and touchdown vibration according to the treatment method of the reserved buffer layer. Furthermore, the collapse and disintegration effects of frame structure blasting demolition in different blasting schemes are compared and analyzed by theoretical analysis, numerical simulation, and field test. The results show that the hinge point forward high blasting cutting can increase the inclination angle, prolong closure time, and control the structure's collapse recoil and touchdown vibration, greatly improving the reliability of structural instability and collapse. Compared with the traditional bottom-cutting blasting scheme, the reserved buffer layer hinge point forward high-cutting blasting scheme can effectively shorten the length of the blasting pile, reduce the speed of structural collapse to the ground, and effectively control the height of the blasting pile. The selection of a reserve buffer layer should be considered comprehensively with the structural characteristics of the building and the surrounding environment.

Prestressed continuous rigid-frame bridges, a prevalent structural system in large-span bridge construction, present unique demolition challenges due to spatial constraints and adjacent infrastructure constraints during demolition. This study examined the controlled demolition of a river-crossing, prestressed, continuous, rigid-frame bridge using a blasting demolition practice. The demolition strategy incorporated mechanical crushing of mid-span deck and wing plates, complemented by strategically positioned blasting cuts at critical structural elements, including piers, mid-span box girder webs, top slabs, external prestressed steel cable anchor piers, and bridge-end box girder connections. The implementation of a sequential detonation order (mid-span box girders followed by external prestressed cable anchor piers, concluding with bridge-end connections and piers) resulted in controlled segmental collapse. Numerical simulation using LS-DYNA's dynamic finite element analysis validated the demolition scheme, revealing key process parameters: a total collapse duration of 4.5 seconds and a deck impact velocity of 13.6 m/s. The analysis identified impact stress as the primary mechanism for structural disintegration. A significant finding emerged regarding external prestressing technology. While originally implemented to enhance service performance and load-bearing capacity, the release of prestressing forces through controlled blasting was found to improve structural fragmentation efficiency significantly. Field implementation demonstrated the technical feasibility and safety of this approach, providing an effective solution for dismantling long-span, prestressed, continuous, rigid-frame bridges in complex environments. The study establishes a comprehensive framework for similar demolition projects, highlighting the importance of integrated mechanical and explosive techniques in modern bridge demolition engineering.

In order to study the dynamic mechanical response characteristics of crystalline graphite ore under the coupling effect of grade and dynamic load, the dynamic compression tests of crystalline graphite ore samples with four grade levels (5.19%, 10.79%, 12.65%, and 15.50%) under different impact pressures were carried out by using a 50 mm diameter split Hopkinson pressure bar test device. The effects of grade and strain rate on the dynamic mechanical properties and energy consumption characteristics of crystalline graphite ore were comparatively analyzed. Furthermore, a dynamic constitutive model for crystalline graphite ore incorporating both grade and strain rate effects was established based on the viscoelastic ZWT model. The test results show that the dynamic compressive strength and peak strain of crystalline graphite ore increase progressively with rising strain rate, while the elastic modulus remains strain-rate-independent. As the ore grade increases, the initial compaction deformation and peak strain of the samples increase, whereas the dynamic elastic modulus, dynamic compressive strength, and their strain-rate sensitivity gradually decrease. Additionally, within a specific strain rate range, the degree of fragmentation of medium- and low-grade ores intensifies with increasing energy consumption density. In contrast, high-grade ores exhibit minimal variation in fragmentation degree. This indicates that ore grade significantly influences the dynamic fragmentation behavior of crystalline graphite ore. A dynamic constitutive model that considers both grade and strain rate was established, and its accuracy and applicability were verified by comparing the model-predicted results with experimentally obtained dynamic stress-strain curves. The model offers theoretical support for investigating the mechanical behavior of crystalline graphite ore under dynamic loading.