基于螺旋平行线与时域反射法的地面塌陷变形测量技术研究
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摘要
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时域反射法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。
The defects of the surface subsidence measurement technology at present and proposes a new method for measuring the surface subsidence was briefly described. 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.
The defects of the surface subsidence measurement technology at present and proposes a new method for measuring the surface subsidence was briefly described. 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.
引文
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2 郭广礼,缪协兴,张振南.老采空区破裂岩体变形性质研究.科学技术与工程,2002;(5):44—47Guo Guangli,Miao Xiexing,Zhang Zhennan.Researchon ruptured rock mass deformation characteristics of Longwall Goafs.Science Technology and Engineering,2002;(5):44—47
3 王建良,姚激,蒲秀荣.软岩边坡稳定性的FLAC和刚体极限平衡法对比分析.科学技术与工程,2009;(16):4693—4697Wang Jianliang,Yao Ji,Pu Xiurong.Analyze aweak rock slope's stability with FLAC&limit equilibrium method.Science Technology and Engineering,2009;(16):4693—4697
4 蒋小珍,雷明堂,顾维芳,等.线性工程路基岩溶土洞(塌陷)监测技术与方法综述.中国岩溶,2008;(02):172—176Jiang Xiaozhen,Lei Mingtang,Gu Weifang,et al.Soil cave monitoring and sinkhole prediction in linear engineering:summarize.Carsologica Sinica,2008;(02):172—176
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