By glassy, the eruption cloud that coarse rock particle forms jams not only engine, still can wear away windshield, attaint plane navigation and communication system.
由玻璃质的、粗糙的岩石微粒构成的火山灰云不仅堵塞发动机，还会磨损挡风玻璃，损坏飞机导航与通讯系统。
Basen on the criteria of the peak particle velocity(PPV) for blast-induced damage, the design approach for excavation blasting near contour of rock slope is discussed.
基于岩石爆破损伤影响范围控制的质点峰值振动速度判据，就临近岩石边坡开挖轮廓面的爆破开挖设计方法进行了探讨。
Thus reducing acid concentration or the fluid volume will be benefit for rock structure protection, preventing formation collapse and particle migration in near - wellbore region after acidizing.
降低酸液浓度和用量有利于保护岩石骨架，避免近井眼岩石酸化后造成孔隙坍塌和加速微粒运移。
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