安全与环境工程2025，Vol.32Issue(3)：101-111,11.DOI:10.13578/j.cnki.issn.1671-1556.20240295
冻融与动载耦合作用下砂岩的动力学性能及裂纹扩展规律
Dynamic mechanical properties and crack propagation law of sandstone under the coupling of freeze-thaw and dynamic load
摘要
Abstract
Mine rock slope engineering in alpine regions has always been a research hotspot at home and abroad.Due to the influence of various factors such as freeze-thaw erosion,mining blasting and earthquake,it has caused serious safety hazards and restricted the safe and efficient production of mine resources.In order to further understand the damage and deterioration mechanism of rock mass of mine rock slope under the coupling effect of freeze-thaw and dynamic load,this paper analyzes the mechanical properties and crack propagation law of rock in alpine regions under the coupling effect of freeze-thaw and dynamic load by preparing sandstone samples in mining area,based on freeze-thaw cycle test,split Hopkinson pressure bar(SHPB)test and digital image correlation(DIC)technology.The results are as follows:① The dynamic peak stress and dynamic elastic modulus of sandstone samples gradually decrease with the increase of freeze-thaw cycles,and the peak strain gradually increases with the increase of freeze-thaw cycles.At the same time,the slope of the stress-strain curve in the linear elastic stage decreases with the increase of the number of freeze-thaw cycles.② The distribution of Y-direction strain concentration area in sandstone samples under impact load determines the generation and expansion of initial cracks and secondary cracks in the failure process of the samples.At the same time,the displacement cloud diagram and the positive and negative displacement of the monitoring point can determine the location of the crack and the change of the crack length.The research conclusions can provide a theoretical reference for the prevention and control of disasters such as freeze-thaw and dynamic load in rock mass engineering in alpine regions.关键词
砂岩/动力学特性/裂纹扩展规律/冻融循环/分离式霍普金森压杆(SHPB)试验/数字图像相关(DIC)Key words
sandstone/dynamic characteristic/crack propagation law/freeze-thaw cycles/split Hopkinson pressure bar(SHPB)test/digital image correlation(DIC)technology分类
资源环境引用本文复制引用
何世静,汪漫,焦玉勇,刘文连,许汉华,眭素刚,胡小悦..冻融与动载耦合作用下砂岩的动力学性能及裂纹扩展规律[J].安全与环境工程,2025,32(3):101-111,11.基金项目
武汉市知识创新专项——曙光计划项目(2022010801020429) （2022010801020429）
国家自然科学基金项目(42307191) （42307191）
