基于固有振动频率的滑移式和坠落式危岩块体稳定性评价模型研究
发布时间：2019-03-26 13:08
【摘要】：危岩块体的失稳多表现为突发崩塌破坏,无明显位移特征,因此常规位移监测难以达到监测预警的目的,此外影响危岩块体稳定性重要参数之一的危岩块体与母岩粘结面积难以获得,导致危岩块体稳定性评价困难。本文以危岩块体为研究对象,假设危岩块体均质各向同性,主控结构面为单个平面,系统阻尼比小于1,在振幅范围内的变形为线弹性变形,则可将危岩块体振动模型简化为弹簧振子模型。通过理论推导建立了危岩块体固有振动频率、危岩块体与母岩粘结面积、弹性模量和危岩块体质量之间的关系,再结合极限平衡模型,建立了基于固有振动频率的危岩块体稳定性评价模型。以白河堡水库右岸的危岩块体为试验对象,利用无线振动传感器(微芯方),将采集到的数据采用傅里叶变换等数学方法得到危岩块体固有振动频率,再结合固有振动频率与危岩块体粘结面积、弹性模量、危岩块体质量之间的关系,计算出块体粘结面积,最后基于该模型完成危岩块体稳定性评价。试验验证了基于固有振动频率的危岩块体稳定性评价可行性,相比传统方法更加快捷、准确。
[Abstract]:The instability of dangerous rock block is mostly caused by sudden collapse and failure without obvious displacement characteristics, so it is difficult to achieve the purpose of monitoring and early warning by conventional displacement monitoring. In addition, it is difficult to obtain the bond area between the dangerous rock block and the parent rock which affects one of the important parameters of the stability of dangerous rock block, which leads to the difficulty of evaluating the stability of dangerous rock block. In this paper, the dangerous rock block is taken as the research object, assuming that the dangerous rock block is homogeneous and isotropic, the main structure plane is a single plane, the damping ratio of the system is less than 1, and the deformation in the amplitude range is linear elastic deformation. Then the vibration model of dangerous rock block can be simplified to spring oscillator model. The relationship between the natural vibration frequency, the bond area between the dangerous rock block and the parent rock, the elastic modulus and the mass of the dangerous rock block is derived theoretically, and then combined with the limit equilibrium model. The stability evaluation model of dangerous rock block based on natural vibration frequency is established. Taking the dangerous rock block on the right bank of Baihebao Reservoir as the test object, using the wireless vibration sensor (micro-core square), the natural vibration frequency of the dangerous rock mass is obtained by Fourier transform and other mathematical methods. Combined with the relationship between the natural vibration frequency and the bond area, elastic modulus and mass of the dangerous rock block, the block bond area is calculated. Finally, the stability evaluation of the dangerous rock block is completed based on the model. The experimental results show that the stability evaluation of dangerous rock block based on natural vibration frequency is feasible, which is faster and more accurate than the traditional method.
【作者单位】： 北京科技大学土木与环境工程学院;
【基金】：国家自然科学基金资助项目:基于动力特征参数的边坡危岩块体稳定性监测评价模型研究(No.41572274)~~
【分类号】：TU457
本文编号：2447574
[Abstract]:The instability of dangerous rock block is mostly caused by sudden collapse and failure without obvious displacement characteristics, so it is difficult to achieve the purpose of monitoring and early warning by conventional displacement monitoring. In addition, it is difficult to obtain the bond area between the dangerous rock block and the parent rock which affects one of the important parameters of the stability of dangerous rock block, which leads to the difficulty of evaluating the stability of dangerous rock block. In this paper, the dangerous rock block is taken as the research object, assuming that the dangerous rock block is homogeneous and isotropic, the main structure plane is a single plane, the damping ratio of the system is less than 1, and the deformation in the amplitude range is linear elastic deformation. Then the vibration model of dangerous rock block can be simplified to spring oscillator model. The relationship between the natural vibration frequency, the bond area between the dangerous rock block and the parent rock, the elastic modulus and the mass of the dangerous rock block is derived theoretically, and then combined with the limit equilibrium model. The stability evaluation model of dangerous rock block based on natural vibration frequency is established. Taking the dangerous rock block on the right bank of Baihebao Reservoir as the test object, using the wireless vibration sensor (micro-core square), the natural vibration frequency of the dangerous rock mass is obtained by Fourier transform and other mathematical methods. Combined with the relationship between the natural vibration frequency and the bond area, elastic modulus and mass of the dangerous rock block, the block bond area is calculated. Finally, the stability evaluation of the dangerous rock block is completed based on the model. The experimental results show that the stability evaluation of dangerous rock block based on natural vibration frequency is feasible, which is faster and more accurate than the traditional method.
【作者单位】： 北京科技大学土木与环境工程学院;
【基金】：国家自然科学基金资助项目:基于动力特征参数的边坡危岩块体稳定性监测评价模型研究(No.41572274)~~
【分类号】：TU457
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