The detection system based on ultrasonic synthetic aperture imaging and multi-frequency scanning
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摘要:
通过地下岩体的结构特征和深部空区的勘测技术研究，查明岩体的缺陷区域及地下空间形态的精细化结构特征，对岩溶发育区的地下工程设计及施工具有重要作用。为了进一步了解深部地下岩体的“黑匣子”结构，攻破地下空间精细化勘探的关键技术，文章介绍了一种孔内超声波合成孔径成像与多频扫描探测系统。该系统在钻孔内光学与声学协同作用的基础上，建立了适用于探测复杂地质钻孔岩体结构的多频超声波扫描技术体系，以及具有智能感知和识别能力的钻孔岩体结构综合勘测装备。此外，该系统还能够实现复杂地质环境下钻孔岩壁、孔内溶洞和近场围岩的同步勘测，结合其配套的分析方法，构建了1套集“观察、测量、表征”于一体的钻孔岩体结构综合勘测体系。测试结果表明：孔内超声波合成孔径成像与多频扫描探测系统能够沿钻孔深入到难以触及的地下空间进行360°精细探测，能够丰富地下空间开发与建设中的岩体结构勘测数据，具有较好的前瞻性和广泛的应用前景。
Abstract:It is particularly important for the underground engineering design and construction in karst development areas to identify the refined structure of hollow areas and underground morphology based on the structural characteristics of underground rock mass and survey techniques in deep voids. In order to further understand the “black box” structure of deep underground rock mass and master key technology of accurate exploration in underground space, this article introduces a detection system by borehole ultrasonic synthetic aperture imaging and multi-frequency scanning. According to the synergistic effect of optics and acoustics inside the borehole, this system derived a multi-frequency ultrasonic scanning technology suitable for detecting complex geological borehole rock mass, and designed a comprehensive survey equipment for borehole rock mass structure with intelligent perception and recognition capabilities. In addition, the system can synchronously survey borehole rock walls, caves inside the borehole, and near-field surrounding rocks in complex geological environments. Combined with its supporting analysis methods, we have constructed a comprehensive survey system for borehole rock mass structure integrating “observation, measurement, and characterization”. The test results show that the ultrasonic synthetic aperture imaging and multi-frequency scanning detection inside the borehole can perform 360° precise detection by going into inaccessible underground spaces along the borehole, enriching the survey data of rock structure in underground space development and construction, which has forward-looking and wide application prospects.
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