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Zhao M.,Guizhou Xinlian Blasting Engineering Group Co. | Huang D.,CAS Chengdu Institute of Mountain Hazards and Environment | Cao M.,Hohai University | Chi E.-A.,Guizhou University | And 2 more authors.
Shock and Vibration | Year: 2015

The combined peak particle velocity (PPV) and frequency safety criterion for blast vibration is widely used in blasting engineering. However, some field investigations are inconsistent with this criterion. On the basis of field investigations, it is found that there are two failure modes of structures subjected to blasting seismic waves, that is, first-excursion failure and cumulative plastic damage failure. Moreover, the nature of structural responses under blast vibrations is a process of energy input, transformation, and dissipation. Therefore, an energy-based dual safety standard is proposed in this work to more comprehensively explain all failure modes of structures under blast vibrations. To this end, structures are simplified into elastic-plastic single degree of freedom (SDOF) systems with bilinear restoring force models, and energy responses of SDOF systems are then determined using the Newmark-β method. From the energy responses, the maximum instantaneous input energy and hysteretic energy are selected as the basis of the dual safety criterion, because they can reflect first-excursion failure and cumulative plastic damage failure, respectively. Finally, field investigations in a blasting site in Zunyi, Guizhou province, China, are used to prove that compared to the PPV-frequency criterion the proposed energy-based dual safety criterion is more capable of assessing the damage potential of blast vibrations. © 2015 Mingsheng Zhao et al. Source


Cui X.-J.,Guizhou Xinlian Blasting Engineering Group Co. | Shi C.,Hohai University
Progress in Civil, Architectural and Hydraulic Engineering - Selected Papers of the 4th International Conference on Civil, Architectural and Hydraulic Engineering, ICCAHE 2015 | Year: 2016

A new algorithm, which can randomly generate Karst cave geometry, was developed in this work. Each Karst cave geometry was regarded as a polyhedron. All the suppositional polyhedra, which represent the Karst caves, are cast into the research domain according to the random distribution rule of the Karst caves. Then, the solid polyhedra are transformed into void to model the Karst caves. Thus, the resultant domain is the rock mass that contains Karst caves. Two supernumerary algorithms, the merging neighboring points algorithm and the threshold value interception algorithm, were also employed to obtain caves with random shape and distribution according to the real caves’ shapes, area ratios, radius ranges, distributions and smoothness. The method proposed in this work provides a way to numerically simulate Karst caves. © 2016 Taylor & Francis Group, London. Source


Luo Y.J.,9855 Branch of Guizhou Jiulian Industrial Explosive Materials Development Co. | Tao T.J.,Guizhou Xinlian Blasting Engineering Group Co. | Chi E.A.,Guizhou Xinlian Blasting Engineering Group Co.
Advanced Materials Research | Year: 2014

Emulsion explosive is one of common industrial explosives, its performance ability is important for producer. So the experiment and theory analysis were made to improve the performance ability of emulsion explosive in this paper. The results show that: performance ability of explosive becomes bigger when oxygen balance of explosive is zero or slightly negative; Water content also has a significant impact on stability, density and explosive performance of emulsion explosive; performance ability of emulsion explosive is generally rises with density increasing. The key approaches of improving the performance ability are that improving the explosion heat and hematocrit and selecting appropriate moisture content and density, and advanced process technology also should be put to use. © (2014) Trans Tech Publications, Switzerland. Source


Chi E.,Guizhou Xinlian Blasting Engineering Group Co. | Chi E.,Hohai University | Zhao M.,Guizhou Xinlian Blasting Engineering Group Co. | Liu J.,Hohai University | Kang Q.,Hohai University
Advances in Mechanical Engineering | Year: 2015

The fracture and fragmentation of rock materials are basic and important problem in geomechanics and blasting engineering. An approach, which can simulate the process of fracture and fragmentation of rock materials, is introduced in this work. A beam-particle model is first introduced in the frame of the discrete element method. In the beam-particle model, the neighboring elements are connected by beams. Consequently, a beam network is formed in the particle system. The strength characteristics of rock materials are reflected by the beam network. The strength criterion was then built to verify whether a beam exists or not. The process of rock fracture and fragmentation is described by the gradual disappearance of beams. Finally, two cases were presented to indicate the validity of the method proposed in this work. © SAGE Publications Ltd, unless otherwise noted. Manuscript content on this site is licensed under Creative Commons Licenses. © The Author(s) 2015. Source


Luo Y.J.,9855 Branch of Guizhou Jiulian Industrial Explosive Materials Development Co. | Zhao M.S.,Guizhou Xinlian Blasting Engineering Group Co. | Chi E.A.,Guizhou Xinlian Blasting Engineering Group Co. | Tao T.J.,Guizhou Xinlian Blasting Engineering Group Co.
Advanced Materials Research | Year: 2014

In order to resolve the problems that many units are intersect and mutual restraint in the safety evaluation of emulsion explosive continuous manufacturing, the safety evaluation model based on uncertainty measurement theory was built, then this model was used to evaluate the safety of emulsion explosive continuous manufacturing in one explosive industry. The evaluation results show that: the information entropy and confidence identifying criterion were respectively used to ascertain the evaluation index weight and identifying criterion, by these ways, the evaluation results of this model are more objective; and the evaluation units can be selected flexibly according to actual situation, the calculation of evaluation model is simple, so the evaluation results can offer decision basis for explosive industry to make good management. © (2014) Trans Tech Publications, Switzerland. Source

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