FBG在边坡稳定性监测中的有限元法优化布设  

Optimized layout FBG in stability monitoring of slop by the finite element method

作　　者：李凯[1,2] 赵振刚[1] 蔡陈[1] 谢涛[1] 李英娜[1] 彭李[1] 李川[1] 

机构地区：[1]昆明理工大学信息工程与自动化学院,昆明650500 [2]云南电网有限责任公司电力科学研究院研究生工作站,昆明650217

出　　处：《光学技术》2016年第1期46-49,共4页Optical Technique

基　　金：云南省应用基础研究计划项目(2013FZ021);昆明理工大学人才培养基金资助项目(KKSY201303044);国家自然科学基金项目(KKGD201203004)

摘　　要：为实现FBG对边坡的稳定性监测,需要对传感器的布设进行优化。楚雄腰站变电站二级边坡,平台宽1.5m,坡角30°,材质为回填土,其背靠变电站,易受大型设备压力作用而影响稳定性。建立实际边坡模型,利用有限元强度折减法分析计算,结果显示,最大塑性应变出现在二级边坡平台表面及其附近。所以在二级边坡平台上布设3根应变桩来实现深层监测,实际监测结果显示,各应变桩最大应变分别:420με、400με、-360με,对应位置分别出现在深度1m、2m、2m处,现场观测平台表面及其附近出现裂缝,结果均能够与仿真优化布设结论较好吻合。To achieve the stability monitoring of the slope by FBG,layout of the sensors need to be optimized.The slope in mountainside substation in Chuxiong is secondary.The wide of its platform is 1.5meters,its slope angle is 30°,and the material of the slope is backfill,moreover.Its proximity to the substation,thus the pressure of large equipment affects its stability.Using finite element strength reduction analysis of the established actual slope model,the results show that the maximum plastic strain appears in the surface of the platform and its vicinity.So laid 3root strain pile on the platform to achieve the deep monitoring,the monitoring results show that the maximum strain of each strain pile are：420με,400με,-360με,these positions corresponding to a depth of 1m,2m,2mplaces.Field observations show that cracks appear in the platform surface and its vicinity.The results and the conclusions of the layout with simulation optimizations are good agreements.

关 键 词：光学测量 FBG 稳定性监测 边坡 布设位置 有限元 

分 类 号：TP212.3[自动化与计算机技术—检测技术与自动化装置]