摘要
为了揭示爆破振动与冻融循环耦合作用下寒区挂帮矿边坡失稳机制,提出1种冻融参数折减与爆破荷载等效的数值模拟方法,基于某铁矿构建FLAC3D三维数值模型,通过冻融参数动态折减与爆破荷载叠加,对比分析无爆破扰动、单独冻融影响、单独爆破扰动和冻融爆破耦合下边坡岩体的位移、应力和塑性区演化规律。研究结果表明:爆破振动对位移增量的影响(0.44 mm)高于冻融作用(0.34 mm);在二者耦合作用下位移增量达到0.50 mm,且塑性区范围扩大了12%~18%,加剧了岩体的损伤。研究结果证实冻融和爆破振动耦合下的渐进损伤效应,提出的耦合数值计算方法可为寒区边坡安全评估提供参考。
This study proposed a numerical simulation method of dynamic reduction of freeze thaw parameters and superposition blasting load to reveal the instability mechanism of the hanging wall slope in cold regions under the coupled effect of blasting vibration and freeze thaw cycles.Through the method of dynamic reduction of freeze-thaw parameters and superposition of blasting loads,a FLAC3D three-dimensional numerical model was established based on an iron mine to conduct comparative analyses the displacement,stress,and plastic zone evolution patterns of slope rock masses under four working conditions:no blasting disturbance,isolated freeze-thaw effects,isolated blasting disturbance,and coupled freeze-thaw-blasting interactions.The results indicate that blasting vibration contributes more to displacement increments(0.44 mm)compared to freeze thaw effects(0.34 mm).Displacement increments reached 0.50 mm under the coupling effect of both factors,meanwhile,the plastic zone expansion ranging from 12%to 18%,exacerbating rock mass damage.The findings confirmed the progressive damage effect under the coupling of freeze thaw and blasting vibration,and the proposed coupled numerical calculation method can provide references for safety assessment of slopes in cold regions.
作者
田小龙
张春阳
段文权
胡凯兵
TIAN Xiaolong;ZHANG Chunyang;DUAN Wenquan;HU Kaibing(School of Resources and Environmental Engineering,Wuhan University of Technology,Wuhan Hubei 430070,China;State Key Laboratory of Safety and Health in Metal Mines,Maanshan Anhui 243000,China;Sinosteel Maanshan General Institute of Mining Research Co Ltd,Maanshan Anhui 243000,China;Northern Mining Co.,Ltd.,Beijing 100053,China)
出处
《中国安全生产科学技术》
北大核心
2025年第7期13-20,共8页
Journal of Safety Science and Technology
基金
国家自然科学基金项目(52174088,52474108)。
关键词
爆破振动
挂帮矿开采
边坡稳定性
数值模拟
岩石冻融
blasting vibration
hanging wall mining
slope stability
numerical simulation
freeze thaw action
