地球物理学进展 ›› 2016, Vol. 31 ›› Issue (1): 427-432.doi: 10.6038/pg20160150

• 应用地球物理学Ⅱ • 上一篇    下一篇

桥梁基础冲刷过程原位电学监测技术

郭秀军1, 尚可旭1, 张刚2, 丁浩1, 贾永刚1, 郭磊1   

  1. 1. 中国海洋大学环境科学与工程学院, 青岛 266100;
    2. 山东省交通厅基本建设工程质量监督站, 济南 271000
  • 收稿日期:2015-01-23 修回日期:2015-05-05 出版日期:2016-02-20 发布日期:2016-02-20
  • 作者简介:郭秀军,男,1972年生,山东莱芜人,博士,教授,主要从事环境岩土工程方面的教学和科研.(E-mail:guojunqd@ouc.com)
  • 基金资助:

    国家自然科学基金重大仪器专项(41427803)、国家自然科学基金项目(40706020)和山东省交通科技项目(2008K002)联合资助.

Bridge scour monitoring using electrical resistivity pole system

GUO Xiu-jun1, SHANG Ke-xu1, ZHANG Gang2, DING Hao1, JIA Yong-gang1, GUO Lei1   

  1. 1. Ocean University of China, Qingdao 266100, China;
    2. Basic construction engineering quality supervision station Shandong communications department, Jinan 271000, China
  • Received:2015-01-23 Revised:2015-05-05 Online:2016-02-20 Published:2016-02-20

摘要:

强水流作用下桥基桩周土的快速冲刷是造成桥梁垮塌事故的主要诱因.为实现冲刷过程长期有效实时监测,在综合分析声纳、超声波、光纤测量等已有监测技术优缺点基础上,基于水土介质导电性差异引起的传导电场变化,设计了一种新型桥基冲刷电学监测方法并构建了实时监测系统.采用模拟计算和室内试验方式研究了监测系统对水土界面反映能力和影响因素.研究结果显示系统抗干扰能力强,水土界面位置表现为典型的"之"字形电阻率异常,易于确定,且界面监测误差小于1/2电极间距(1 cm).目前该系统已应用于胶州湾大桥架设区侵淤过程监测中,为桥基安全性评判和预警体系构建提供了技术支撑.

Abstract:

The quick scour of bridge foundation pile soil by strong current is considered to be the major inducement for bridge collapse accidents. In order to achieve a long-time、effective and real-time monitoring on the scouring process, we comprehensively consider the pros and cons of the existing monitoring technology,for example,sonar,ultrasonic wave and optical fiber, and finally design a new electrical monitoring method on bridge foundation scour and establish a real-time monitoring system. What we depend on is the change of conduction caused by the difference of water and soil medium conductivity.We adopt simulated calculation and laboratory test to explore the monitoring system's reaction capacity and influence factor on the water-soil interface.Research results show that the system has strong anti-interference capacity,what's more, the water-soil interface shows typical zigzag pattern resistivity anomaly and it's easy to be identified. The error of interface monitoring is less than 1/2 of the electrode spacing(1 cm).The system has been applied to monitor the silt erosion process of JiaoZhou Bay Bridge erection area, providing technical support for the bridge foundation security evaluation and the construction of early warning system.

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