A remote automatic monitoring system for subgrade settlement is researched and developed based on the techniques of laser measurement, advanced sensor and wireless network, etc. The monitoring system is composed of automatic laser measurement subsystem for surface settlement, simultaneous automatic measurement subsystem for subgrade layered settlement and lateral displacement, automatic measurement subsystem for the transverse section settlement of subgrade, and data acquisition and wireless transmission subsystem. The automatic measurement of surface settlement is realized by adopting the techniques of laser measurement and automatic calibration. The simultaneous automatic measurement of subgrade layered settlement and lateral displacement is achieved by using Hall sensor, laser ranging and tilt sensor. The automatic measurement of subgrade transverse section settlement is accomplished by the tilt sensor driven by master and slave motors. Field experiments were carried out in Jinan West Station of Jing-Hu highspeed railway after the lab verification and engineering design of the monitoring system. The long-term, comprehensive, remote automatic monitoring of subgrade settlement including total settlement, local settlement and different layer settlement of section has been realized.%研发基于激光测量、先进传感和无线网络等技术的路基沉降远程自动监测系统.监测系统包括表面沉降激光自动测量、路基分层沉降与横向位移同时自动测量、路基横向剖面沉降自动测量和数据采集与无线传输4个子系统.表面沉降自动测量采用激光测量和自动标定技术实现；路基分层沉降与横向位移同时自动测量采用霍尔传感器、激光测距和倾角传感器实现,路基横向剖面沉降自动测量采用主、从电机带动倾角传感器实现.监测系统经实验室验证及工程化设计,在京沪高铁济南西站现场实验,实现了对路基整体沉降、局部沉降截面内不同层沉降的长期、全面、远程自动监测.
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