坠落式危岩振动特性模拟试验方法研究  

Study on simulation test method for vibration characteristics of unstable rock

作　　者：姚国专 余波[3] 陈筠[1] 蔡德钩[2,4] 闫宏业[2,4] 姚建平[2,4] 

机构地区：[1]贵州大学资源与环境工程学院,贵州贵阳550025 [2]高速铁路轨道技术国家重点实验室,北京100081 [3]中国电建集团贵阳勘测设计研究院,贵州贵阳550082 [4]中国铁道科学研究院铁道建筑研究所,北京100081

出　　处：《铁道建筑》2015年第12期88-92,共5页Railway Engineering

基　　金：中国铁道总公司铁道科学技术研究发展中心科研项目(J2014G006);中国铁路总公司科技研究开发计划项目(2014Z003-A;2014Z003-B;2014Z003-D);贵州省地质工程研究生教育创新实践基地创新项目(DZ2014001)

摘　　要：根据危岩野外实际存在状态分析坠落式危岩与基岩的接触特点,应用相似理论,重点考虑模型几何关系、接触关系和边界条件的相似性,建立了能反映危岩振动特性及稳固特性的室内试验模型。分析了传感器的固定方式、激励力锤类型、激励力大小和激励方向对试验结果的影响。结果表明:测振传感器宜采用粘结性较好的胶水来固定;激励源宜选用激振时作用时间短、产生能量较高的钢性锤,以满足要求的振动频带范围;激励力大小和激励方向变化时岩块振动卓越频率一致,说明激励方式对危岩振动特性影响较小;在本模型试验激振作用下,振动幅值随危岩贯通率减小而减小、卓越频率随危岩贯通率减小而增大。An indoor test model which can reflect the vibration characteristics and stability ofis established according to the actual state of unstable rock in field with analysis of contact characteristics between falling unstable rock and bedrock. Based on Similarity theory,similarity of geometrical relationship,contact relationship and boundary conditions were mainly considered in this model. Analysis the effects on the test results from sensor fixed method,force hammer type,excitation force value and the excitation position. Determine analysis process of vibration signal from which indoor model test. The results show that vibration sensor should be fixed by glue with strong adhesive strength,and the excitation source should use the rigidity hammer with short acting time and high energy during the excitation to meet the test concerned vibration frequency range. The same predominant frequency from rock block vibration with different excitation value and different excitation azimuth shows that the excitation method has less impact on the vibration characteristics of unstable rock model. Under the vibration excitation in this test model,the vibration amplitude is decreasing with the decreasing of unstable rock penetration rate,predominant frequency is increasing with the decreasing of unstable rock penetration rate.

关 键 词：危岩 振动特性 卓越频率 振动波形 模拟试验 

分 类 号：U216.415[交通运输工程—道路与铁道工程]