粤赣高速公路K3边坡光纤监测与数值模拟对比分析

Comparative Analysis of Fiber Monitoring and Numerical Simulation on the K3 Slope of Guangdong-Jiangxi Expressway

本文采用基于FLAC3D软件的数值模拟方法,对粤赣高速公路K 3边坡工程锚杆的应力应变状态进行数值模拟,分析了全长粘结式锚杆的荷载传递机理;根据运用基于自发布里渊背向散射原理(BOTDR)的分布式光纤应变传感技术对锚杆的轴向应变进行的监测数据,分析了工程锚杆的变形特征。数值模拟与实测数据的对比分析表明,模拟曲线与监测曲线反映的工程锚杆的变形特征具有较高的一致性,验证了应用FLAC3D有限差分软件模拟锚杆-框架体系应力应变特征的合理性,以及基于BOTDR的锚杆应变分布监测的可行性。

By use of the method of FLAC^3D-based numerical simulation on the K3 slope of Guangdong- Jiangxi expressway, the stress transfer mechanism of fully grouted anchor bolt was studied; and using the distributed strain sensing technology based on spontaneous Brillouin hackscattering, a long-term monitoring on the axial strain of anchor bolt was made, and the deformation characteristics and performance of distributed optical fiber strain sensing were analyzed. By comparison of simulation results and monitoring data, it is verified that bolt-frame system could be applied to rock slope and anchor bolt monitoring based on BOTDR is feasible.