应用激光多普勒测振仪的岩块体累计损伤评价试验研究

发布时间：2018-04-07 17:48

本文选题：岩石力学　切入点：损伤评价　出处：《工程科学学报》2017年01期

【摘要】：岩块体崩塌破坏的突发性使其成为最难预防的地质灾害,严重威胁人类的生命财产安全.边坡岩块体崩塌破坏多是系统不稳定导致的动力破坏,而用振动特征参数来进行安全监测和损伤评价更为有效.本文应用激光多普勒测振技术,通过固有振动频率对危岩块体主控结构面的黏结力损伤进行定量分析.通过改进后的极限平衡模型,得出结构面不断劣化块体的安全系数由原来的1.17下降到1.04,与实际破坏结果相符.试验结果表明:固有振动频率一方面可对危岩块体累积损伤进行有效识别,另一方面可以为黏结力参数的合理确定提供客观的数据支持.因此,基于固有振动频率分析的激光多普勒测振技术可实现边坡岩块体的累计损伤评价,并将在未来的工程应用中发挥巨大的作用.
[Abstract]:The sudden collapse and destruction of rock mass makes it the most difficult geological disaster to prevent, which seriously threatens the safety of human life and property.The failure of rock mass is mostly the dynamic failure caused by the instability of the system, but it is more effective to use the characteristic parameters of vibration to monitor the safety and evaluate the damage.In this paper, laser Doppler vibration measurement technique is used to quantitatively analyze the bond force damage of the main control structure surface of a dangerous rock block by natural vibration frequency.By using the improved limit equilibrium model, the safety factor of the structural surface is reduced from 1.17 to 1.04, which is consistent with the actual failure results.The experimental results show that the natural vibration frequency can effectively identify the cumulative damage of dangerous rock blocks on the one hand, and provide objective data support for the reasonable determination of bond force parameters on the other hand.Therefore, the laser Doppler vibration measurement based on natural vibration frequency analysis can realize the cumulative damage evaluation of slope rock mass, and will play a great role in the future engineering application.
【作者单位】：北京科技大学土木与资源工程学院;长崎大学工学部;绍兴文理学院山体地质灾害防治协同创新中心;中国矿业大学深部岩土力学与地下工程国家重点实验室;
【基金】：国家自然科学基金资助项目(41572274,41372370) 中国博士后科学基金资助项目(2016M591078) 中央高校基本科研业务费资助项目(FRF--TP-16--014A1) 北京科技大学“创新人才培养”项目(USTB201309FX) 浙江省山体地质灾害防治协同创新中心开放基金课题(PCMGH--2016--Y-02)
【分类号】：TU45

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