基于硅压阻式传感器的静压桩贯入模型桩土界面应力测试

Lateral Earth Pressure Measurement on the Pile-Soil Interface for the Jacked Pile Installation Using Silicon Piezoresistive Sensors

静压桩贯入时要求传感器具备高灵敏度和准确性,还要求其动态频响高、测量范围宽及尺寸小。针对静压桩贯入模型试验,采用硅压阻式土压力和孔隙水压力传感器分别记录贯入过程中在桩土界面产生的侧压力和孔隙水压力,并对测试结果进行分析。结果表明:硅压阻式传感器适用于静压桩贯入模型试验,可以准确测试桩土界面侧压力和孔隙水压力随贯入深度的变化规律。

Silicon piezoresistive sensors have the characters of having high sensitivity,high accuracy,high dynamicfrequency,wide measuring range and small size.These characteristics can be used to monitor the jacked pile installation.The silicon piezoresistive earth pressure sensors and pore water pressure sensors were used to test lateral pressure and pore water pressure at the interface between the pile and the soil.The test results show that the silicon piezoresistive sensors can be used to monitor the jacked pile installation for they can accurately measure the lateral earth pressure and the pore water pressure at the interface between the pile and the soil at various installation depths.