Zhang Yongquan, Tang Huiming, Li Changdong, Lu Guiying, Cai Yi, Zhang Junrong, Tan Fulin
Faculty of Engineering, China University of Geosciences, Wuhan 430074, China.
School of Mechanical Engineering and Electronic Information, China University of Geosciences, Wuhan 430074, China.
Sensors (Basel). 2018 Jan 14;18(1):224. doi: 10.3390/s18010224.
The physical model test of landslides is important for studying landslide structural damage, and parameter measurement is key in this process. To meet the measurement requirements for deep displacement in landslide physical models, an automatic flexible inclinometer probe with good coupling and large deformation capacity was designed. The flexible inclinometer probe consists of several gravity acceleration sensing units that are protected and positioned by silicon encapsulation, all the units are connected to a 485-comunication bus. By sensing the two-axis tilt angle, the direction and magnitude of the displacement for a measurement unit can be calculated, then the overall displacement is accumulated according to all units, integrated from bottom to top in turn. In the conversion from angle to displacement, two spline interpolation methods are introduced to correct and resample the data; one is to interpolate the displacement after conversion, and the other is to interpolate the angle before conversion; compared with the result read from checkered paper, the latter is proved to have a better effect, with an additional condition that the displacement curve move up half the length of the unit. The flexible inclinometer is verified with respect to its principle and arrangement by a laboratory physical model test, and the test results are highly consistent with the actual deformation of the landslide model.
滑坡物理模型试验对于研究滑坡结构破坏具有重要意义，而参数测量是该过程中的关键。为满足滑坡物理模型中深部位移的测量需求，设计了一种耦合性好、变形能力大的自动柔性测斜仪探头。柔性测斜仪探头由多个重力加速度传感单元组成，这些单元通过硅封装进行保护和定位，所有单元均连接到485通信总线。通过感知两轴倾斜角度，可计算出测量单元位移的方向和大小，然后根据所有单元依次从下到上累加得到整体位移。在角度到位移的转换过程中，引入了两种样条插值方法对数据进行校正和重采样；一种是对转换后的位移进行插值，另一种是对转换前的角度进行插值；与方格纸上读取的结果相比，后者效果更佳，条件是位移曲线向上移动单元长度的一半。通过实验室物理模型试验对柔性测斜仪的原理和布置进行了验证，试验结果与滑坡模型的实际变形高度一致。
