“揭河底”期间胶泥块底部受力监测试验设计

Block Monitors Test Design of Bottom Force During "Bottom-Tearing Scouring"

为了跟踪监测"揭河底"期间河床上的胶泥块底部水流上举力的变化过程,设计了一套模型试验方法。该试验采用A401压力传感器,胶泥块由中值粒径小于0.01 mm的极细粉煤灰制成。将压力传感器布置在胶泥块预留空间的底部,涂刷亲水性底基处理胶,使胶泥块与传感器连为整体;连接传感器的数据线顺水流方向布设,以尽量减少数据线对水流的干扰。试验过程中,压力传感器可以对胶泥块在揭起前、揭起瞬间及翻转期间的底部水流上举力进行实时采集。

In order to track monitoring the uplift processes of clay block on the fiver-bed during ＂bottom-tearing scouring＂, a model test method was designed. This test adopted A401 pressure sensor, and selected clay block made by very fine fly ash which median grain size was less than O. O1 ram. Pressure sensor was placed at the bottom of the block reserved space with hydrophilie base adhesive to make block and the sensor as a sin-gle whole; the sensor data line was laid along flow direction in order to decrease the data line interference to the flow. In testing process, pressure sensor could do the real-time data collection of the bottom force of clay b]ock lifted anterior, transient and turnover.