Rock breaking technique plays an important role in rock excavation engineering, such as mining, tunnel construction and hydropower engineering. Pneumatic fracturing with carbon dioxide (CO₂) ice powder is potentially a safe and efficient rock breaking method, which is one of the most pertinent research topics in rock breaking. A site test of pneumatic rock breaking with CO₂ ice powder was carried out on a tuff hill with a compressive strength of 80 MPa. The attenuation of peak particle velocity (PPV) induced by pneumatic rock breaking with CO₂ ice powder was studied and the vibration effect on surrounding buildings was evaluated. The research results demonstrate that: (1) the pneumatic rock breaking with CO₂ ice powder is greatly affected by quasi-static pressure of high-pressure gas with many macrocracks formed near boreholes; (2) with increase in distance, the PPV decreases in the form of a power function with dominant frequency less than 100 Hz, And when the charge of CO₂ ice powder is 4 kg, the PPV reduced down to 21.9 mm/s at the distance of 2.8 m; (3) a simplified motion model of vibration waves propagating in slope is established, showing that the steeper the slope, the faster does the PPV attenuate; and (4) pneumatic rock breaking with CO₂ ice powder is safer than traditional liquid CO₂ and explosive blasting, and it can significantly improve rock breaking efficiency.

破岩技术在矿山、隧道施工、水电工程等岩石开挖工程中占有重要地位。二氧化碳（CO ₂）冰粉气力压裂是一种潜在的安全高效的破岩方法，是破岩领域最相关的研究课题之一。在抗压强度为80 MPa的凝灰岩山上进行了CO ₂冰粉气动破岩现场试验。研究了CO ₂冰粉气动破岩引起的峰值粒子速度（PPV）的衰减，并评估了对周围建筑物的振动影响。研究结果表明：（1）CO ₂气动破岩冰粉受高压气体准静压力影响较大，在钻孔附近形成许多宏观裂缝；(2)随着距离的增加，PPV以主频小于100Hz的幂函数的形式减小，当CO ₂冰粉装药量为4 kg时，PPV减小到21.9 mm/s 2.8 m 的距离；(3)建立了振动波在斜坡上传播的简化运动模型，表明斜坡越陡，PPV衰减越快；(4)CO ₂冰粉气动破岩比传统的液体CO ₂和爆炸爆破更安全，可显着提高破岩效率。