基于侧向土压力确定冲淤深度的可行性研究

由于冲刷和淤积引起的结构物和航运安全问题,水下泥面的冲淤监测已经成为结构健康监测中的一项重要任务。对基于侧向土压力确定水下冲淤深度的方法进行可行性研究。该方法利用以光纤光栅作为传感元件的传感器,正面承受水土,背面承受水压力,通过测量正面和背面的压力差可以精确测量侧向土压力;由于水体中水平方向只有水压力,水体中水平方向由侧向土压力和孔隙水压力组成,因此通过若干只不同深度位置的传感探头,可计算出冲淤深度。该方法能实现实时反馈水工结构的冲淤情况,为水工结构安全运行提供可靠的数据支持。

Feasibility study of scour depth determination based on lateral soil pressure measurement

In view of safety aspects of hydraulic structures and waterways caused by erosion and siltation, underwater mud silting monitoring has become an important task in structural health monitoring. This paper introduces feasibility study of the scour depth determination based on lateral soil pressure measurement. Sensors which are made of FBG are used as the sensing element, whose front side is under soil pressure, and back side is under the water pressure. It can accurately monitor the lateral soil pressure by measuring the front and back pressure difference. The pressure in the horizontal direction is only water pressure in water, while it consists of lateral earth pressure and pore water pressure in soil. Therefore, it can calculates the scour and siltation depth according to the measured values given by the sensor probes placed at different depths and positions. The method can do feedback of erosion and siltation of the hydraulic structures in time during calculating analysis, and provide reliable data for the safe operation of hydraulic structures.