摘要
针对露天矿山反倾层状节理岩质边坡在循环爆破下的动力响应及累积损伤破坏问题展开数值模拟研究,首先基于前人模型试验采用3DEC软件建立了露天矿山反倾层状节理岩质边坡数值计算模型,并利用边坡动力响应、破坏模式及稳定性变化规律等模拟结果与已有模型试验结果进行对比,验证了数值模型的合理性。其次,通过参数敏感性分析研究了层面和节理面强度参数(即粘聚力和摩擦角)对边坡永久位移及稳定性的影响规律。发现监测点位移随着循环爆破次数的增加而增加,并在边坡发生破坏时出现陡升现象;随着层面和节理面强度的增加,监测点位移减小,边坡稳定系数增加。而随着循环爆破次数的增加,监测点位移基本呈波动式增加,边坡稳定系数则逐渐减小。该研究成果可为循环爆破作用下露天矿山反倾层状节理岩质边坡的稳定性评价提供理论支撑。
A numerical simulation study is performed to investigate the dynamic response and cumulative damage failure mechanisms of an anti-dip layered jointed rock slope in an open-pit mine subjected to cyclic blasting vibrations.First of all,a numerical model of the anti-dip layered jointed rock slope in the open-pit mine is established using the 3DEC code,building upon prior physical model tests.The simulated dynamic response,failure modes,and slope evolution are compared with experimental results to validate the numerical model′s accuracy.Subsequently,a sensitivity analysis is conducted to examine the effects of bedding and joint surface strength parameters(i.e.,cohesion and friction angle)on the slope′s permanent displacement and stability.The results indicate that the displacement of monitoring points increases progressively with the number of cyclic blasting events,with a sharp surge upon slope failure.Furthermore,higher bedding and joint surface strength parameters lead to reduced displacement and an increased slope stability coefficient.However,as the number of cyclic blasting events increases,the displacement of monitoring points shows an upward trend,while the stability coefficient gradually declines.These findings offer valuable theoretical insights for the design and construction of anti-dip layered jointed rock slopes subjected to cyclic blasting.
作者
刘红岩
张光雄
甄一豪
刘强
马平
王福瑛
樊剑男
毛烽
LIU Hong-yan;ZHANG Guang-xiong;ZHEN Yi-hao;LIU Qiang;MA Ping;WANG Fu-ying;FAN Jian-nan;MAO Feng(School of Engineering and Technology,China University of Geosciences(Beijing),Beijing 100083,China;Poly Explosive Hami Co.,Ltd.,Hami 839000,China;RIOH Transport Consultants Ltd.,Beijing 100088,China;China Construction Infrastructure Construction Co.,Ltd.,Beijing 100044,China)
出处
《爆破》
2026年第1期29-37,共9页
Blasting
基金
新疆维吾尔自治区“天池英才”领军人才计划项目(2023)
巴里坤科技计划项目(2025)
中建基础科技研发课题(CSCIC-2025-KT-5)
地球深部探测与矿产资源勘查国家科技重大专项(2024ZD1004106)。
关键词
循环爆破
反倾层状岩质边坡
PGA
永久位移
边坡稳定性系数
数值模拟
cyclic dynamic load
rock slopes with anti-dip layered joints
PGA
permanent displacement
slope stability coefficient
numerical simulation
