论文部分内容阅读
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.
The rapid erosion of the soil around the bridge foundation under the strong water flow is the main cause of the collapse of the bridge.In order to realize the long-term effective and real-time monitoring of the erosion process, based on the comprehensive analysis of the advantages and disadvantages of the existing monitoring technologies such as sonar, ultrasonic and optical fiber measurement, Based on the change of electric field induced by the difference of conductivity of soil and water medium, a new monitoring method of bridge foundation scouring is designed and a real-time monitoring system is established. The influence of monitoring system on water-soil interface and its influencing factors are studied by simulation and laboratory tests. The results show that the anti-interference ability of the system is strong, and the typical interface resistivity of water-soil interface is easy to determine, and the monitoring error of the interface is less than 1/2 electrode spacing (1 cm) .This system has been applied to Jiaozhou Bay Bridge erection siltation monitoring process, for the safety assessment and early warning bridge foundation system to provide technical support.