硅压阻式传感器在静压桩贯入试验中的应用

针对静压桩贯入模型试验,基于多晶硅材料的扩散硅膜片制成的硅压阻式传感器,用于静压模型桩贯入过程桩端阻力数据实时采集。试验结果表明,该种传感器适用于静压桩贯入过程的监测,传感器表面需与桩端端部齐平,桩身表面开槽封装传感器导线可以避免贯入时损坏导线。通过分析贯入过程压桩力、桩端阻力和桩侧摩阻力,发现压桩力随模型桩入土深度的增加并没有呈现较明显的线性增大;贯入阻力主要是由桩端阻力产生,桩侧摩阻力较小;贯入试验中静压桩存在桩端残余应力,桩端残余应力与桩端阻力变化曲线相近。该结论为桩基础设计提供了有利参考。

APPLICATION OF SILICON PIEZORESISTIVE SENSORS IN JACKED PILE DRIVING MODEL TEST

Silicon piezoresistive sensors which were produced based on the diffusion silicon diffusion silicon diaphragm of polycrystalline sihcon material,was used to collect the real-time date of resistance at pile end while jacked model pile was driving.The test results show that the sensors can be used for monitoring driving with the jacked pile.The surface of sensors need flush pile end.The pile surface was slotted to avoid damage to conductors of sensors.The jacking pressure,resistance at pile end and lateral resistance of pile was analyzed in detail.It is found that jacking pressure with depth is not linear in crease;penetrating resistance is caused by resistance at pile end,lateral resistance of pile is low.Jacked pile has residual stress at the pile end in driving test,the curve of residual stress at the pile end is similar to resistance at pile end,so as to provide a useful reference for pile foundation design.