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为实现对公路边坡的稳定性安全监测,需要检测边坡的应变变化。元绿公路K77+120~K77+215段为一坡度30°、高度差达65m的边坡,由于土质松散而形成一滑坡地带,在其自然坡面前端挖掘5个30m深钻孔,把光纤Bragg光栅应变传感器分别埋入5个钻孔之中,浇灌水泥使之固定,形成5个应变桩,实现对桩体的应变监测,从而反应边坡的应变变化情况。经过两个月的监测,1孔洞到5孔洞最大应变变化依次为400με、80με、130με、-60με、46με,且依次出现在6m、16m、14m、16m、30m深度的位置。表明此边坡在6m深度及15m深度地层结构比较松散。
In order to realize the safety monitoring of highway slope stability, it is necessary to detect the change of slope strain. Yuan-Qing Highway K77 + 120 ~ K77 + 215 is a slope with a slope of 30 ° and a height difference of 65m. Due to loosening of soil, a landslide zone is formed. Five 30m-deep boreholes are excavated on the front of its natural slope, Bragg grating strain sensors were buried in the five borehole, irrigation cement to make it fixed, the formation of five strain pile, to achieve the strain of the pile monitoring to reflect the slope of the strain changes. After two months of monitoring, the maximum strain changes from 1 hole to 5 hole are 400με, 80με, 130με, -60με, 46με, followed by 6m, 16m, 14m, 16m and 30m depths. It shows that the slope is relatively loose at 6m depth and 15m depth.