The Study of Landslide Evaluation in Lisan ( Using Time Dormain Reflectometry )

• Main Authors: Rong-bin Chang, 張榮斌
• Other Authors: Miau-bin Su
• Format: Others
• Language: zh-TW
• Published: 2001
• Online Access: http://ndltd.ncl.edu.tw/handle/27653814040448254795

碩士 === 國立中興大學 === 土木工程學系 === 89 === TDR (Time Dormain Reflectometry) is used to find discontinuous positions in the communication path. It mainly utilize the process of electromagnetic wave as monitoring at the time when wave meets the change of media cause refraction and reflection. TDR cable is a continuous, multiple points monitoring sensor, not limited by the installing direction neither encroached by the subterranean material. In the lab, typical deformation of the cable lines can be related to the change of the waveform. The quantification between the amount of deformation and the magnitude of reflection has also been concluded to certain degree of relationship. In the application of the survey in spot landslide, TDR has the very tendency to replace the traditional system. This research tried to combine the explanation of some parts of the relative theories and the result of various kinds of indoors-simulation, aiming at the unusual phenomenon of various kinds of field data to propose explanation for comparison in the future. Meanwhile, it is based on the synthetic condition of wave and on length variation between signature to analyze the depth of sliding zone and to verify its possibility with coring and monitoring data. Finally, according to all items of test analysis and result discussion, the following conclusions are reached: 1. It is reasonable to count the travelling length using center of wave node near the sign. 2. According to the result together with studied by formers, typical transformation relative to wave variation, both the two stations found the phenomenon quite coincided. It helps to understand that landslide mechanism happened in the strata. 3. Indoor simulation work makes the analysis of field waveform more applicable in the future.