Research progress and development trend of carbon dioxide phase transition fracturing
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Abstract: With the continuous advancement of urban construction, more and more underground projects have begun to break rocks near sensitive areas such as hospitals and schools. As is known, urban blasting will have a great impact on the safety of surrounding buildings, and may also bring noise and flying rocks, so the explosives sometimes cannot be approved. The efficiency of breaking rock by using machinery is too low, which greatly affects the speed of rock excavation, which may influence the cost of the project. In view of this situation, engineers began to use carbon dioxide phase transition fracturing for rock fragmentation in these complex and sensitive environments. As an environmental-friendly green rock breaking technology, carbon dioxide phase transition fracturing has the advantages of high rock breaking energy, low vibration, and no pollution. In recent years, it has become a hot topic in the field of rock breaking and excavation. There is the rapid development of carbon dioxide phase transition fracturing research. Many scholars have made several useful progresses in this gas explosion technology by using theoretical analysis, experiment, and numerical simulation in a wide range. Through investigation and analysis of existing related research results, in this paper, we elaborated the rock breaking mechanism of carbon dioxide phase change fracturing, reviewed the research status of the fracturing load characteristics and its testing method, recapitulated the main influencing factors of fracturing load and rock breaking effect, and analyzed the harmful effects of fracturing, and generalized the application of this technology in several fields. Finally, the problems and future challenges in carbon dioxide phase transition fracturing were discussed, future work would be carried out around the analysis of the carbon dioxide phase transition fracturing mechanism, the optimization design and parameter selection of fracturing pipe components, and the establishment of engineering fracturing parameter design specifications. This paper will provide references for theoretical research and engineering application.