锚固洞室中不同方向爆炸应力波传播规律及裂纹形成机理研究

发布时间：2018-03-19 21:21

本文选题：地下工程　切入点：锚固洞室　出处：《应用力学学报》2016年06期 　论文类型：期刊论文

【摘要】：基于抗爆模型试验结果,利用数值分析软件研究锚固洞室中不同方向爆炸应力波传播规律及裂纹形成机理。通过分析锚固洞室爆炸压应力时程曲线规律,发现压应力时程曲线特征符合应力波的一般传播作用规律,这说明数值分析的结果比较合理。集中装药爆炸后,应力波以球面向四周扩散传播,随着时间推移,快速衰减。当应力波向上传播到地表时,会在地表附近发生多次"层裂"形成大面积裂纹,爆源从拱顶至侧墙,地表面附近受拉破坏越来越轻,其中直墙侧爆不发生受拉破坏;当应力波向下传播至地下洞室时,由于反射拉伸,会在锚固区及其末端发生"层裂"。随着应力波继续传播,经由上地表反射的拉伸波会与由洞室表面反射的拉伸波发生相遇,形成加载波,一旦加载波的强度大于围岩的动态抗拉强度,会在相应的位置形成裂纹。
[Abstract]:Based on the experimental results of anti-explosion model, the propagation law of explosion stress wave and the mechanism of crack formation in different directions of Anchorage cavern are studied by using numerical analysis software. It is found that the characteristics of the compressive stress time-history curve accord with the general law of stress wave propagation, which shows that the numerical analysis results are reasonable. After the concentrated charge explosion, the stress wave diffuses around the spherical surface, and with time, the stress wave propagates along with time. When the stress wave propagates upward to the surface of the earth, there will be many "spallation" near the surface to form a large area crack, the source of explosion from the vault to the side wall, the tensile damage near the ground surface is getting lighter and lighter, in which the vertical wall side explosion does not occur tensile damage; When the stress wave propagates down to the underground cavern, the "spallation" will occur in the Anchorage zone and its end due to reflection and tension. As the stress wave continues to propagate, the tensile wave reflected through the upper surface will meet the tensile wave reflected from the surface of the cave. Once the strength of the loading wave is larger than the dynamic tensile strength of the surrounding rock, the crack will be formed in the corresponding position.
【作者单位】：河南理工大学深部矿井建设重点学科开放实验室;中国科学技术大学近代力学系;安阳师范学院基建处;
【基金】：国家自然科学基金(11502074) 河南省科技攻关(142102210433) 河南省教育厅科学技术研究重点项目科技攻关计划(14A440003) 深部矿井建设省级重点实验室开放基金(2014KF-05)
【分类号】：TU457

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