摘要
为解决现有的边坡稳定性分析方法计算效率低、误差大等问题,设计了一种新型光纤光栅(Fiber Bragg Grating,FBG)传感器。在考虑温度补偿的情况下,该传感器采集边坡内部位移变化,并采用中心差分法(Central Difference Method,CDM)作为将测得的应变转换为周围土体水平位移的优化算法,该算法的优点在于计算误差较小,一旦监测工作准备就绪,根据目标函数的最大位移增量,在优化模型中由监测位移确定潜在的边坡滑动面。最后,采用毕肖普法进行积分处理,估算边坡安全系数。在同样的滑动面荷载情况下,相比于积分法的安全系数具有较小的下降梯度。通过模拟实验,验证了该分析方法和光纤光栅监测技术的可行性和可靠性。
The purpose of this paper is to design a new Fiber Bragg Grating(FBG)sensor to solve the problems of low calculation efficiency and large error of the existing analysis methods of slope stability.Considering the temperature compensation,the sensor collects the internal displacement changes of the slope,and uses the Central Difference Method(CDM)as the optimization algorithm to convert the measured strain into the horizontal displacement of the surrounding soil.The advantage of the algorithm is small calculation error.Once the monitoring work is ready,according to the maximum displacement increment of the objective function,the potential slope sliding surface is determined by the monitoring displacement in the optimization model.Finally,the Bishop method is used for integral processing to estimate safety factor of the slope.Under the same sliding surface load,the safety factor has a smaller downward gradient compared with the integral method.Through simulation experiments,the feasibility and reliability of the analysis method and fiber Bragg grating monitoring technology are verified.
作者
章龙飞
ZHANG Longfei(Jiangxi Academy of Water Science and Engineering,Nanchang 330029,Jiangxi,China)
出处
《矿产勘查》
2022年第5期676-682,共7页
Mineral Exploration
关键词
地质调查工程
边坡防护
边坡稳定性分析
光纤光栅传感器
中心差分法
最优滑动面
geological survey engineering
slope protection
slope stability analysis
fiber bragg grating sensor
central difference method
optimal sliding surface
作者简介
第一作者:章龙飞,男,1988年生,本科,工程师,主要研究方向为水土保持与荒漠化防治等,E-mail:shouxun058193570@126.com。
