基于主动超声激励的岩石节理刚度分布测量研究  

Measurement of distribution of rock joint stiffness based on active ultrasonic excitation

作　　者：王鹏宇 杨天娇 王述红[3] WANG Pengyu;YANG Tianjiao;WANG Shuhong(College of Transportation Engineering,Nanjing Tech University,Nanjing 210009,China;School of Physical and Mathematical Sciences,Nanjing Tech University,Nanjing 210009,China;School of Resources and Civil Engineering,Northeastern University,Shengyang 110004,China)

机构地区：[1]南京工业大学交通运输工程学院,江苏南京210009 [2]南京工业大学数理科学学院,江苏南京210009 [3]东北大学资源与土木工程学院,辽宁沈阳110004

出　　处：《岩土工程学报》2024年第3期662-669,共8页Chinese Journal of Geotechnical Engineering

基　　金：国家自然科学基金项目(U1602232);中央高校基本科研业务专项项目(N2101018);江苏省自然科学基金项目(BK20230335)。

摘　　要：Goodman提出采用节理刚度表征复杂岩石节理面的拓扑行为并为其提供定量值,而无需对节理面的粗糙度、接触面积等参数进行详细测量分析。然而目前对岩石节理刚度的测量仍存在局限,因此,在试验室环境下采用压电陶瓷换能器对完整平板试件和含节理平板试件进行弹性波激励,同时采用三维扫描激光多普测振仪监测平板内弹性波的传播数据。将采集的波场信号数据进行滤波、插值、积分等一系列处理,并基于Schoenberg线性滑移模型计算节理刚度分布,实现岩石节理接触行为的全局参数表征,同时进一步验证了岩石节理全场超声表征的可行性。全场波形数据清晰地揭示了岩石节理界面接触行为,为后续深入探索岩石节理几何形状、孔径、界面性质及其地震特征之间的相互关系奠定了基础。Goodman proposed to use the joint stiffness to characterize the topological behaviors of complex rock joint interfaces and provide quantitative values for them,without measuring and analyzing the geometric parameters such as roughness and contact area of joint interfaces in detail.However,it is difficult to measure the stiffness of rock joints at present.Therefore,the piezoelectric ceramic transducer is used to excite the elastic waves of the intact granite plate specimen and the cracked granite plate specimen in the laboratory environment.At the same time,the scanning laser Doppder Vibrometer is used to monitor propagation data of the elastic waves in the plate.On this basis,the collected signal data of wave fields are processed by filtering,interpolation,integration,etc.,and the distribution of joint stiffness is calculated based on the Schoenberg linear sliding model.Then,the joint stiffness is used to parameterize the contact behaviors of rock joints,which further proves the feasibility of ultrasonic characterization of whole rock joints.By using the full-field waveform data,the interface contact behaviors of rock joints are clearly revealed,which lays a foundation for further exploring the relationship among rock joint geometry,pore sizes,interface properties and seismic characteristics.

关 键 词：岩石节理 接触行为 弹性波 剪切刚度 法向刚度 

分 类 号：TU45[建筑科学—岩土工程]