期刊论文

Pressure variation and coal fracturing law of liquid CO_2 phase transition jet

Bai, X.

中文

中国矿业大学学报

1000-1964

2020

49

4

661-670

10.13247/j.cnki.jcumt.001171

2016ZX05045-004:国家科技重大专项 2020JJ5484:湖南省自然科学基金 51874053:国家自然科学基金 2019YFS0483:四川省科技计划 190XQD084:南华大学博士科研启动基金

本校为第一且通讯机构

基于液态CO2相变致裂技术,研发了液态CO2相变射流煤岩致裂实验装置,对液态CO2相变射流压力随时间衰减规律及其致裂煤岩宏微观破坏规律进行研究.结果表明:液态CO2相变射流压力随时间呈指数关系衰减,建立的指数型液态CO2相变射流压力随时间变化理论模型符合实验规律;三向压力值对液态CO2相变射流裂隙扩展方向有较大的影响,受主应力比影响致裂裂隙会向主应力较大的方向扩展,且致裂裂隙均处于优势致裂范围内;液态CO2相变射流煤岩破坏区面积、致裂孔隙及裂隙的数量与尺寸、大孔和可见孔容量等参数随着CO2初始压力的增加而增大.

Based on the principle of liquid CO2 phase transition jet coal fracturing technology, a novel experimental device was developed, and the law of pressure variation with time and the laws of macro and micro fracture of liquid CO2 phase transition jet coal were studied. The results show that the pressure of the liquid CO2 phase transition jet exponentially decays with time, and the theoretical model of the pressure variation with time of the exponential liquid CO2 phase transition jet established by the theoretical study accords with the experimen...