基于螺旋平行线与TDR的地面塌陷变形测量技术研究

简述了当前对地面塌陷测量技术的缺陷并提出一种新型的测量方法。说明了螺旋平行线的结构并对其电路特性进行了分析推导，得出其特性阻抗随拉伸变形增大而增大，且介电常数对其特性阻抗影响较小的结论。说明了结合螺旋平行线的TDR方法可应用于地面塌陷的测量，拉伸变形量反映地面塌陷程度，反射信号的波峰对应的位置即为地面塌陷变形的位置。最后通过室内实验，并结合UVE-PLS的数学模型建立了螺旋平行线拉伸变形量与反射信号值的数学关系，并得到了较准确的预测结果。

Research on the Deformation Measurement of Ground Subsidence Based on Spiral Parallel Cable and TDR

This paper briefly describes the defects of the surface subsidence measurement technology at present and proposes a new method for measuring the surface subsidence. The structure of the spiral parallel cable is illustrated and its circuit characteristics are deduced,it is concluded that the characteristic impedance increases with the increase of tensile deformation,and the dielectric constant has little effect on the characteristic impedance. TDR method combined with spiral parallel cable can be applied to the measurement of ground subsidence.Tensile deformation reflects the extent of surface subsidence,and the position of the peak of the reflection signal is the location of the ground subsidence deformation. In the end,the mathematical model of the UVE-PLS which sets up the relationship between the tensile deformation and the reflection signal is established,and gets accurate prediction results.