| 张邦,张炀,周杰.大直径桩端岩溶三维高精度成像方法*[J].,2024,43(5):1060-1069 |
| 大直径桩端岩溶三维高精度成像方法* |
| Three dimensional high precision imaging method of Karst below large diameter pile |
| 投稿时间：2023-05-15 修订日期：2024-09-02 |
| 中文摘要: |
| 在岩溶地区，大直径桩基础受桩底桩端岩溶的威胁较大，传统的钻探和物探等手段难以实现桩底桩端岩溶三维精细探测。本文提出了一种基于超声成像原理的桩底桩端岩溶探测方法，使用超声相控阵传感器在桩底采集全矩阵数据，采用全聚焦方法可对桩底桩端岩溶成像。为解决超声远场成像横向分辨率低的问题，在桩底多个测点采集全矩阵数据，采用多面阵合成孔径全聚焦技术进行远场成像，实现桩底桩端大范围、大深度、高精度成像。制作1:1足尺桩基岩溶物理模型实验模型并开展了探测实验，证实了该方法的有效性，结合工程实例检验了该方法的实用性。结果表明，该方法可以对桩底桩端10m深度范围内的岩溶进行三维高精度成像，探测分辨率达0.1m。该方法为大直径桩底桩端岩溶提供了一种全新的、有效的探测技术和手段，对保障岩溶区桩基施工安全与质量控制具有重要的意义。 |
| 英文摘要: |
| In karst areas, large-diameter pile foundations are more threatened by karst at the bottom ofbelow the pile, and traditional methods such as drilling and geophysical exploration are difficult to achieve three-dimensional fine detection of karst below below the pile bottom. This paper proposes a method for detecting karst below the pile bottom based on ultrasonic imaging principle, using ultrasonic phased array sensor to collect full matrix data at the pile bottom, and using full focusing method to image karst below the pile bottom. In order to solve the problem of low lateral resolution of ultrasonic far-field imaging, full matrix data are collected at multiple measurement points at the pile bottom, and multi-array synthetic aperture full focusing technique is used for far-field imaging, realizing large-range, large-depth and high-precision imaging below the pile bottom. A 1:1 full-scale physical model of pile foundation karst was made and detection experiments were carried out, which confirmed the effectiveness of this method. The practicality of this method was verified by combining with engineering examples. The results show that this method can achieve three-dimensional high-precision imaging of karst within 10m depth below the pile bottom, with a detection resolution of 0.1m. This method provides a new and effective detection technology and means for karst below large-diameter pile bottom, which has important significance for ensuring the construction safety and quality control of pile foundation in karst area. |
| DOI：10.11684/j.issn.1000-310X.2024.05.016 |
| 中文关键词: 大直径桩、岩溶探测、超声相控、远场成像、高精度 |
| 英文关键词: large diameter pile karst detection ultrasonic phase control three-dimensional imaging high precision |
| 基金项目:湖北省重点研发项目(2021BAA050), 中铁第四勘察设计院集团有限公司重点研发项目(2020K37,2021C15) |
|
| 摘要点击次数: 122 |
| 全文下载次数: 114 |
|
查看全文
查看/发表评论 下载PDF阅读器 |
| 关闭 |
