液态CO2相变破岩参数及数值模拟研究

为更好地了解液态CO₂相变破岩技术，对液态CO₂相变的相关参数进行了研究。并通过调节装药不耦合系数，对传统数值模拟方法进行优化，确定了用于施工现场的布孔方式。结果表明:所采用的CO₂相变致裂器的TNT当量为0.29 kg，乳化炸药当量为0.41 kg；其作用于孔壁上的爆轰压力为1 200 MPa，仅为乳化炸药爆轰压力的7.8%；爆容为509 L/kg，约为乳化炸药爆容的50%；破岩范围半径约为1.75 m。提出了用于工程现场的致裂方案，取得了良好的破岩效果。

Study on Rock Breaking Parameters and Numerical Simulation of Phase Transition of Liquid CO2

In order to better understand the liquid CO₂ phase change fracturing technology, relevant parameters of liquid CO₂ phase change were studied. By adjusting the charge uncoupling factor, the traditional numerical simulation method was optimized to determine the hole placement method for the construction site. Results show that the CO₂ phase change fracture device used in this test has a TNT explosive equivalent of 0.29 kg and an emulsion explosive equivalent of 0.41 kg. Blast pressure on the hole wall is 1 200 MPa, which is only 7.8% of the blast pressure of emulsion explosives. Blast capacity is 509 L/kg, which is about 50% of the blast capacity of emulsion explosives. Radius of rock breaking range is about 1.75 m. A fracturing scheme was proposed for the project site, which achieved good rock breaking results.