抗滑桩内力的BOTDR监测分析

为了获取抗滑桩的内力分布数据及客观评价抗滑桩工作状态,通过在抗滑桩上布置光纤传感器,对抗滑桩进行桩身应变监测.研究结果表明:该种测量方法实现从抗滑桩浇注完成至滑坡推力作用整个过程的应变变化过程的监测,成功采集到抗滑桩受力过程中桩身任意深度处的应变;抗滑桩浇注完成后,由于混凝土凝固,首先有一个桩身收缩的过程,达到稳定的时间约4个月;选取桩身收缩应变完成点作为计算初值,再依据钢筋混凝土构件计算理论,对抗滑桩的轴向应力进行计算分析,得出抗滑桩目前的安全状态评价结论.

BOTDR monitoring analysis of anti-sliding pile internal force

In order to get the internal force distribution data of anti-sliding piles and evaluate their working state,distributed optic fiber sensing technique was used in landslide engineering monitoring strains of anti-sliding piles.Research results show that the process of strain variation from pile casting to push acting on pile is monitored;The strain in arbitrary depth of anti-sliding pile body is successful collected.Strain variation of anti-sliding pile because of the shrinkage of concrete achieves stable time about 4 months.Selecting the strain of the stable time as an initial value,according to the calculation theory of reinforced concrete,anti-sliding pile axial stress is computed and the current state of the safety evaluation of anti-sliding pile is obtained.