Experimental Study on Variations of Tilt Monitoring Devicesdue to the Slope Ambient Impact

• Main Authors: Kai-Chun Yang, 楊凱鈞
• Other Authors: Ta-Teh
• Format: Others
• Language: zh-TW
• Published: 2016
• Online Access: http://ndltd.ncl.edu.tw/handle/72775w

博士 === 中原大學 === 土木工程研究所 === 104 === MEMS Titlemeter which is used in the current slope and bridges monitoring experiences has temperature compensation function and temperature–inclination of the relation formula which can correct the inclined values. However in the field monitoring, as the ambient temperature raise, the inclined values will undergo a not regular delay period, then the variation occurs. Therefore, the variation of inclination values which cause by the ambient temperature still cannot be efficiently corrected. In addition, the MEMS Titlemeter which undergo a long-term field monitoring, the inclination value will also be affected by other environmental factors, and lead to false alarms from monitoring system. In this study, self-made WSN tilt meter can set in the National Highway No. 3 3K+100 for nearly one year. The monitoring results preliminary clarify the main slope environment factors which cause the variability and stability of inclined values.By planning to use without any holder, high and low ambient temperature laboratory test will be used to test WSN tilt meter by the degree of influence on the inclination of values. Based on laboratory test results, WSN 0.1。Tilt meter which is less affected by temperature will be set in the field under two different ways: the traditional fixing method (i.e. using bolts and nuts) and the new compound material ― Greenpower to enclose and install devices. The result shows that the traditional fixing method will be affected by high/ low ambient temperature, then the effect of thermal expansion and contraction, uneven internal stress occurs. Under the influence of wind, rain and other environmental factors, result in an unstable and increased variability inclined values.This study also approve Greenpower to enclose and install devices, can be effectively reduce the impact of high/ low ambient temperatures, wind, rain and other environmental factors on the value of an inclination. Based on laboratory and field tests, incorporating the variability caused by various environmental factors, and used the statistics principle "Control Chart" to set appropriate management value.In the future, WSN tilt meter is suitable for slope surface inclination variation for long-term monitoring, and can provide the actual slope inclination state. Also can be regard as a reference for slope stability of railway and highway, to achieve real-time disaster prevention.