超声波钻孔成像技术在岩体质量定量评价中的应用  

Application of ultrasonic borehole imaging technique in quantitative evaluation of rock mass quality

作　　者：刘冀昆 王成虎 乾增珍[1] 周昊 谷佳诚 Liu Jikun;Wang Chenghu;Qian Zengzhen;Zhou Hao;Gu Jiacheng(China University of Geosciences,Beijing 100083,China;National Institute of Natural Hazards,Ministry of Emergency Management,Beijing 100085,China)

机构地区：[1]中国地质大学(北京),北京100083 [2]应急管理部自然灾害防治研究院,北京100085

出　　处：《工程勘察》2022年第12期6-11,46,共7页Geotechnical Investigation & Surveying

基　　金：国家重点研发计划课题资助(2021YFC3001901)。

摘　　要：岩体质量分级工作是各类重大基础设施工程前期工程勘察阶段的重要基础研究工作,利用传统的人工岩芯编录开展岩体质量评价已无法满足日益精细的定量化工程建设需要。超声波钻孔成像技术可以精确测定钻孔所揭露各类结构面的产状信息、赋存状态和分布特征,极大地改善传统人工方法中的不足之处。本文提出利用超声波钻孔成像技术代替传统的人工编录和测定岩芯参数的方法,基于高精度的超声波钻孔成像数据计算岩体质量指标IRMI、结构面密度、体积节理数J_(v)、软弱结构面影响系数K_(2)等定量化指标,可以极大地提升岩体质量评价结果的精度和定量化水平。研究工作利用一个钻孔展示了这种新方法的可行性和优越性。研究案例表明,通过该技术得出的岩体质量指标更加准确、高效,在岩体质量评价上适用性较强,为今后岩体质量评价向定量化、高精度方向发展提供了新的技术方法。Rock mass quality classification is an important basic research work in the preliminary engineering investigation stage of all kinds of major infrastructure projects.The traditional manual core logging technique during the ranking of rock mass quality cannot meet the quantitative engineering needs for the increasing refined infrastructure projects.Ultrasonic drilling imaging technique can accurately determine the occurrence information,existence state and distribution characteristics of various structural planes revealed by drilling,which greatly overcome the shortcomings of traditional artificial methods.In the study,the ultrasonic borehole imaging technique is used to replace the traditional manual logging and determination technique for core parameters.Based on high-precision ultrasonic borehole imaging data,the quantitative indexes such as rock mass quality index IRMI,discontinuity density,volume joint number J_(v) and soft discontinuity influence coefficient K_(2) are calculated.Such measures can greatly improve the accuracy and quantitative level of the ranking results of rock mass quality.The research work demonstrates the feasibility and advantages of the new method used in a borehole.The case study shows that the rock mass quality index obtained by this technique is more accurate and efficient,and has strong applicability in the ranking of rock mass quality,which provides a new technical method for the development of quantitative and high-precision rock mass quality evaluation in the future.

关 键 词：岩体质量评价 超声波钻孔成像技术 岩体结构面 IRMI指数 

分 类 号：TU459.3[建筑科学—岩土工程]