【作者】 裴华富；

【导师】 凡友华； 殷建华；

【作者基本信息】 哈尔滨工业大学 ， 结构工程， 2008， 硕士

【摘要】 本文应用光纤布拉格光栅传感器对攀枝花至田房(川滇界)高速公路(简称为攀田高速)12个高边坡进行健康监测。采用FBG制作新型深部测斜仪,并应用到边坡监测中,研究采用新的方法计算深部测斜仪的挠度,建立优化模型来求解潜在滑裂面的位置。同时,利用Geo-slope软件中的SLOPE/W模块对边坡进行稳定性分析。研究内容及成果如下:1)分别在深部测斜仪及锚杆安装光纤布拉格光栅应变和温度传感器,数值模拟分析确定深部测斜仪在边坡上的布设位置,采集监测数据,根据光纤布拉格光栅波长与应变之间的关系公式,得到锚杆、深部测斜仪各测点的点应变。引入差分方法计算测斜仪挠度,通过实验室标定,与文献中方法进行对比,验证差分方法的优越性,然后利用差分方法计算得到深部测斜仪挠度值。2)对离散的挠度数值进行多项式拟合,以挠度与深部测斜仪所在直角坐标系中的相应位置为约束条件,建立最优化数学模型,利用Lingo软件求解,得到圆弧形潜在滑裂面的位置。3)对攀田高速公路所监测高边坡进行数值模拟,算得支护前后边坡的最小安全系数,考虑施工操作平台等因素对边坡稳定性的影响,针对现场的锚杆灌浆长度,分别对不同锚固段长度进行数值模拟,为以后的边坡支护提供参考依据。本文首次利用FBG制作深部测斜仪,并对其精度进行分析,利用差分方法计算挠度,为以后的监测数据处理提供手段;对加固前后的边坡进行数值模拟,及时评估加固后边坡的稳定性和安全性,降低滑坡风险。更多还原

【Abstract】 In this paper, we used fiber-optic Bragg grating sensors to monitor 12 high slopes belong Pan-Tian (Sichuan-Yunnan border) highway. We used FBG to make a new type of inclinometer. We also have done some research on the calculation method of inclinometers deflection, set up an optimal mathematic model to compute out the potential slip surface. Then used the SLOPE/W module of Geo-slope software to simulate the stability of these slopes.Research content and results are as follows:1) We have made and installed strain and temperature sensors onto anchors and inclinometers respectively. Determined the positions of Inclinometers according to numerical simulation anslysis. We analyzed data, calculated out the force and deformation of anchors and inclinometer through the relationship between wavelength and strain. Then, we established a numerical model to derive the position of potential slip surface.2) We also have fitted the discrete data by polynomial, took coordinate of inclinometers as constraints, set up optimal model to calculate out the position of potential slip surface.3) At last, we have done some numerical simulation on slopes monitored besides Pan-Tian highway road, calculated out the minimum safety factor considering of work platform and so on. About the length of different bonds, we have done some numerical simulation about various bonds, supplied the reference for design and construction afterward.In this thesis, we used differential method to calculate the deflection of inclinometers firstly. Meanwhile, we analyzed the accuration of this method, so we supplied an mthod for monitoring. Then we had done some numerical simulation on slopes reinforced and not reinforced, evaluated the stability of slopes punctually, supplied reference for design and construction afterward.更多还原