Three-dimensional Measurement Of Underground Displacement Based On Double Mutual Inductance Contour Voltage

Landslide is a very common and destructive geological disaster.In order to better avoid landslide disaster and greatly reduce or prevent the loss caused by landslide disaster,it is necessary to monitor the landslide in real time.There are many monitoring methods for landslide disaster,and the most effective monitoring method is underground displacement monitoring.In view of the shortcomings of current landslide displacement monitoring technologies,a new three-dimensional underground displacement monitoring technology based on double mutual inductance contour voltage method is proposed in this paper.And the Internet of things technology is applied to this measurement system to realize the remote real-time monitoring of underground displacement three-dimensional measurement.The main research contents and achievements of this paper are as follows:(1)Scheme design of underground displacement three-dimensional measurement system.The structure design and function analysis of underground displacement three-dimensional measurement system are introduced,and the workflow and working principle of the system are described in detail.(2)Hardware design of underground displacement three-dimensional measurement system.According to the modularization,the hardware circuit of the measurement system is designed,and the devices of each module are reasonably selected.(3)Build an experimental platform to simulate the underground displacement of rock and soil mass.The double mutual inductance voltage acquisition experiment is designed to obtain the double mutual inductance voltage datasets under different inter-axial angle,and the underground displacement calibrator and parser are compiled to realize automatic measurement.(4)Establish and verify the measurement model.Based on the interval-interpolation and contour-modeling,an underground displacement measurement model to convert the double mutual inductance voltages and the inter-axis angle into the relative displacement between adjacent sensing units is established,and the experiment is verified by the experimental platform.(5)Build Io T cloud platform and remote monitoring interface.The measurement data is sent to the IOT cloud platform in real time through 4G wireless communication module,the web visualization interface and mobile visualization interface are designed to view the data uploaded by the measurement system in real time on the web page or mobile application,so as to realize remote real-time monitoring.The accuracy and reliability of the measurement model are verified through the rock and soil mass underground displacement experimental platform.The experimental results show that when the horizontal displacement and vertical displacement are within the measurement range of 0-50 mm,the maximum measurement error will not exceed 0.6 mm,which can effectively monitor the three-dimensional changes of landslide underground displacement and meet the accuracy requirements of landslide underground displacement monitoring.