高速公路软基孔隙水压光纤光栅监测技术

摘要

The pore water pressure monitoring is one of the most important projects in highway soft founda-tion construction. Monitoring the change of pore water pressure helps us to master the consolidate process of soft foundation. The traditional monitoring instruments have such drawbacks as low automation and in-strument reliability,intimely data transmission,and expensive monitoring. According to the highway soft foundation pore water pressure monitoring project in Jiujiang City,the fiber grating pressure sensor monito-ring principle and embedded technology were studied. The stability of optical fiber monitoring system is proved through long time monitoring on construction site. It is of great significance in promoting the devel-opment of optical fiber sensing technology in the field of soft base monitoring.%孔隙水压力监测是高速公路软基施工过程中极为重要的监测项目之一，通过对孔隙水压力的变化监测可以动态掌握软基的固结变化过程。目前采用的传统电测仪器存在自动化程度低、数据传输不实时、人工监测费用高等状况，故结合九江绕城高速公路软基孔隙水压监测项目，介绍了光纤光栅渗压传感器监测原理以及软基中的埋设安装工艺，通过对施工现场长时间的监测证实了光纤监测系统的稳定性，以加快光纤传感技术在软基监测领域的应用。