Experimental and numerical study on blast-induced rock damage and fragmentation under low temperatures

作者：Zilong Zhou, Zhen Wang, Ruishan Cheng, Jiaming Wang · 发表于：Engineering Failure Analysis · 年份：2025 · DOI：10.1016/j.engfailanal.2025.109497 · 被引用次数：18 · 研究领域：Rock Mechanics and Modeling、Landslides and related hazards、Geophysical Methods and Applications

• Blast-induced rock fragmentation under different low temperatures is compared. • Fractal dimension of blast-induced low-temperature rock fragmentation is obtained. • Blast-induced damage of multi-gradient low-temperature rock is identified. • Different multi-gradient low-temperature rock blasting performances are analyzed. Low temperatures in cold regions have significant effects on rock blasting performance, e.g., blast-induced rock fragmentation. However, very limited study has explored the influences of sub-zero temperatures on blast-induced rock response. The present study employs experimental tests and numerical simulation to examine the damage and fragmentation of rock subjected to blasting under low-temperature conditions. The small-scale blasting tests of rocks at room temperature (i.e., 20 °C) and different low temperatures (i.e., from −10°C to −40°C) are first conducted to examine low temperatures’ effects on blast-induced rock fragmentation by using the three-parameter Generalized Extreme Value (GEV) function and fractal theory. The findings indicate that the average sizes of blast-induced rock fragments first increase and then fall as the rock temperature drops from 20 °C to − 40 °C, and the least uniform fragment size distribution is presented at −30 °C. Moreover, the numerical models of a full-scale deep borehole are established to examine the effects of different low-temperature gradient characteristics in rock mass on the damage and fragmentation of rocks ca...