光纤Bragg光栅应变桩在公路边坡中的监测研究

The research on monitoring of fiber Bragg grating strain pile in highway slope

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 achieve the safety monitoring about the stability of the highway slope, the strain of the slope is detected. The Yuanlv highway K77＋120 - K77＋215 has a slope which is 30 degrees and 65m height difference, and a landslide zone is formed because of soft soil. Digging 5 30m deep holes on the front of the natural slope, the fiber Bragg grating strain sensor is embedded in 5 holes. Also pouring cement to make it fixed and 5 strain piles are formed so that the strain monitoring of the pile is achieved and strain variation of slope is respond. After two months＇ monitoring, the maximum strain of 1 to 5 holes are 400με, 80με, 130με,-60με, 46με, and these strain in turn appeared in the 6m, 16m, 14m, 16m, 30m depth. These results indicate that the strata structure of the slope is relatively loose in the 6m depth and 15m depth.