液态CO2相变破岩技术在地铁基坑开挖中的应用
Application of liquid CO2 phase change rock breaking technology in metro foundation pit excavation

针对硬岩地质的地铁基坑开挖工程，传统的炸药破岩技术存在着炸药审批困难、储存运输风险高和爆破能量难以控制等问题。为解决上述问题，以长沙某地铁基坑开挖工程为背景，运用液态CO2相变破岩技术替代传统炸药爆破进行破岩开挖，并对其破岩效果和安全性进行分析与监测。研究结果表明：液态CO2相变破岩技术在破岩效果上能替代传统炸药爆破的方式，在安全性上符合爆破安全规程规定，可在类似硬质岩体的开挖工程中推广使用。
In the subway excavation project of hard rock geology, the traditional explosive breaking technology has the problems such as the difficulty of the examination and approval, the high storage and transportation risk, and the difficult control of blasting energy and so on. Aimed at the above problems, the Changsha subway excavation project as the background, the liquid CO2 phase change rock breaking technology was used to replace the traditional blasting for rock excavation, rock breaking efficiency and safety were analyzed and monitored. The results show that the liquid CO2 phase change rock breaking technology can replace the traditional explosive blasting method in rock breaking efficiency, comply with safety regulations for blasting in safety, and can be used in similar hard rock excavation engineering application