New Monitoring System of Anchored Slope Protections

摘要

In fact, huge number of ground anchors with concrete frame are used to protect landslide of slope in cold regions, which may have a serious risk of rupture or pop out of wires due to over tensioned and loosening caused by frost heave and thaw settlement of slope. Center hole type load cells are generally used to monitor tension force of wires at ground anchor head, which have not been effectively used to cover wide area of slope because they are expensive, large, and heavy to deal. Authors are developing a new monitoring system of anchored slope protections making use of small, light, and low-cost MEMS inclinometer and wireless communication device, which might be replaceable with the direct measurement of wire tension using large load cells. Tension force of anchored wires is calculated using precise data of inclination angle of anchored concrete frame obtained by sensors fixed near to anchor head. The frame inclination data are telecommunicated by wireless through communication base nearby to display on web site in real time. Monitored data in field, laboratory test results using model frame, and FEM analysis are shown in the paper, which support the system is highly practical to know real time condition of slope stability, and to judge optimal time of re-tense of wires effectively in minimum number.