SC-CO (Supercritical carbon dioxide) directional fracturing is a promising alternative to explosive blasting in complex environments. This study aims to establish an equivalent method for directional fracturing using traditional explosives, promoting broader adoption of this technology. We conduct a comparative experiment analyzing explosive and SC-CO rock breaking, developing the SPH (Smoothed Particle Hydrodynamics) numerical model that includes characteristics of the rock-breaking area and dynamic effects of SC-CO and explosives. Additionally, we investigate the influence of the directional fracturing device on the energy release coefficient. Proposing a numerical simulation method for SC-CO directional fracturing based on equivalence to No.2 rock emulsion explosive, we use the SPH particle algorithm to enhance visualization of the rock-breaking area. Our findings show that the explosive method yields a larger rock-breaking volume than SC-CO. Under identical explosive charges, the directional cracker model inhibits explosive energy release, with energy decreasing as distance increases. Calculating an inhibition coefficient of 0.45 for the cracker model in terms of explosive granite, the rock-breaking volume index is 0.48, with an average value of 0.465. In mudstone sites, a similar trend is observed with an average energy release inhibition coefficient of 0.44.

中文翻译：

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SC-CO2定向压裂乳化炸药破岩SPH数值模拟

SC-CO（超临界二氧化碳）定向压裂是复杂环境中爆炸爆破的一种有前景的替代方案。本研究旨在建立一种使用传统炸药进行定向压裂的等效方法，促进该技术的更广泛采用。我们进行了炸药和 SC-CO 岩石破碎的对比实验，开发了 SPH（平滑粒子流体动力学）数值模型，其中包括岩石破碎区域的特征以及 SC-CO 和炸药的动力效应。此外，我们还研究了定向压裂装置对能量释放系数的影响。提出一种基于等效2号岩石乳化炸药的SC-CO定向破裂数值模拟方法，利用SPH粒子算法增强岩石破裂区域的可视化。我们的研究结果表明，爆炸方法比 SC-CO 产生更大的岩石破碎体积。在相同的炸药装药量下，定向爆破模型抑制爆炸能量释放，能量随着距离的增加而减少。以爆炸花岗岩计算裂解器模型的抑制系数为0.45，破岩体积指数为0.48，平均值为0.465。在泥岩场地中，也观察到类似的趋势，平均能量释放抑制系数为0.44。