锚杆锚固质量声波检测技术的应用与探索  

The Application and Progress of Offshore Independent Simultaneous Source Acquisition Technology

作　　者：余信江 邹双朝[1,2,3] 邓扬 黎建洲 Yu Xinjiang;Zou Shuangchao;Deng Yang;Li Jianzhou(Engineering Safty and Disaster Research Institute,Changjiang River Scientific Research Institute,Wuhan Hubei 430010,China;Research Center on Water Engineering Safety and Disaster Prevention of MWR,Wuhan Hubei 430010,China;National Dam Safety Engineering Technology Reserch Center,Wuhan Hubei 430010 China)

机构地区：[1]长江科学院工程安全与灾害防治研究所,湖北武汉430010 [2]水利部水工程安全与病害防治工程技术研究中心,湖北武汉430010 [3]国家大坝安全工程技术研究中心,湖北武汉430010

出　　处：《工程地球物理学报》2022年第5期649-656,共8页Chinese Journal of Engineering Geophysics

基　　金：国家自然科学基金青年科学基金(编号:51709015)。

摘　　要：传统锚杆锚固质量检测方法采用拉拔试验来判断锚杆施工质量的好坏,由于是一种有损性检测,难以准确判断锚杆实际长度、孔内砂浆密实性的真实情况。以一维声波反射法传播理论为基础的锚杆锚固质量无损检测技术体系很好地解决了上述问题,声波法作为作为锚杆无损检测常用的方法之一,已在水利水电、交通等工程锚杆支护质量检测中得到了广泛的应用,本文简要概述了国内外锚杆锚固质量无损检测技术和检测设备发展,详细介绍了基于一维杆体的波动理论的锚杆锚固质量检测技术基本原理、锚固长度和饱满度的评价方法,从时域、频域、相位特征分别对比波形信号分析的适用性和局限性,并现场制作5根锚杆锚固试验模型。检测数据结果表明,波形信号的缺陷位置与模型实际设置的缺陷位置基本一致,杆底反射位置通过原始波形较难判断,特别是缺陷较多的波形信号更难以判断,但在模型缺陷位置和杆底反射位置均发现了相位信号明显变化,可为同行研究者提供借鉴。Conventional seismic acquisition requires that sources be separated by sufficient time to avoid significant energy overlap between different sources,which causes longer seismic survey period and higher cost.Based on the guarantee of seismic data quality,in order to minimize survey period and cost,independent simultaneous source technology is introduced and well applied in the field of marine seismic survey.It adopts independent source vessel shooting and continuous recording nodes to process offshore seismic acquisition.The source firing dither time and minimum vessel distance which particularly determines source distribution are key factors of ISS technology,affecting de-blending processing results.The adjacent shots are regarded as random interference in common-receiver gathers,the ISS data are successfully processed through a sparse inversion de-blending to separate the blended source signals.ISS is one of seismic blending acquisitions that has high operational efficiency and low cost,and is more flexible and effective than other blending acquisition methods.Besides reducing survey period and cost,it also lowers the high risk of offshore seismic survey.This paper also expounds the wave field signal apparition,which promotes another innovation of simultaneous source technology.By utilizing a periodic time dithering of source signatures,spectrum differences in f-k domain separate the wavefields from each other,providing guidance for future seismic acquisition.

关 键 词：拉拔试验 一维声波反射法 锚杆锚固质量 

分 类 号：P631.4[天文地球—地质矿产勘探]