振动法与超声波法测试岩块纵波波速的实测比对研究  

Comparison between vibration method and ultrasonic method in measuring longitudinal wave velocity of rock block

作　　者：侯兴民[1] 孙蒙 张一林 HOU Xingmin;SUN Meng;ZHANG Yilin(School of Civil Engineering,Yantai University,Yantai 264005,China)

机构地区：[1]烟台大学土木工程学院,山东烟台264005

出　　处：《振动与冲击》2021年第9期264-269,共6页Journal of Vibration and Shock

基　　金：国家自然科学基金项目(41602284);山东省专业学位研究生教学案例库建设项目(sdyalk1797)。

摘　　要：岩块纵波波速是反映岩块物理性质、内部节理裂隙发育情况和岩体完整程度的一项重要参数,准确测得岩块纵波波速是岩石力学领域亟需解决的一项工作。规范中提到的岩体波速测试方法有地震勘探技术、超声波法等,而岩块波速测试所采用的方法只有超声波法。由于振动波和超声波频率不同,两种方法测得的波速值存在一定差异,因此当岩体纵波波速采用振动法测试时,仍用超声波法测试岩块纵波波速,求得的岩体完整性系数并不能准确地反映岩体的完整程度。基于以上分析,采用振动法准确地测得了岩块纵波波速:在岩块一端激振,利用布设在岩块两端的传感器采集振动信号,从而求得岩块纵波波速。对比结果表明:振动法与超声波法测得的岩块纵波波速最大相对误差达到-7.87%。P-wave velocity of rock block is an important parameter reflecting rock block’s physical properties,development of internal fissures and cracks,and completeness of rock mass.Accurate measurement of P-wave velocity of rock block is an urgent work in field of rock mechanics.The rock mass wave velocity testing methods mentioned in relevant code have seismic exploration technique,ultrasonic method and so on,while only the ultrasonic method is used in rock block wave velocity testing.Due to different frequencies of vibration wave and ultrasonic one,there is a certain difference between wave velocity values measured with the two methods.Therefore,when the vibration method is used to measure longitudinal wave velocity of rock block,the ultrasonic method is also used to do so,and the obtained rock mass integrity coefficient can’t accurately reflect the completeness of rock mass.Based on the above analysis,here,the vibration method was used to accurately measure longitudinal wave velocity of rock block.Vibration was excited at one end of a rock block,and vibration signals were collected using sensors arranged at both ends of the rock block to obtain its longitudinal wave velocity.The comparison between the measured value of rock block’s longitudinal wave velocity using the vibration method and that using the ultrasonic method showed that the maximum relative error between them is-7.87%.

关 键 词：振动法 纵波波速 超声波测试 

分 类 号：TU458[建筑科学—岩土工程]