Abstract
Monitoring of longitudinal land subsidence and deformation in seismic and geological hazards plays an important role in preventing and curing land collapse, land subsidence, and ground cracks. In this paper, a distributed monitoring model experiment on vertical land subsidence and deformation of seismic and geological hazards is carried out by Brillouin optical frequency-domain analysis technology (BOTDA). By using the self-made indoor longitudinal land subsidence and deformation simulation box, different intensity seismic ground is simulated by air bag. Distributed optical fibers are used to monitor the longitudinal land subsidence and deformation during different intensity seismic and geological disasters. According to different intensity seismic and geological disasters, distributed sensing optical fibers cooperate with the ground to compress or stretch longitudinally and obtain the data of longitudinal land subsidence and deformation. The correction coefficient is introduced to modify the monitoring data of confining pressure-sensing optical fiber and complete the precise monitoring of vertical land subsidence and deformation in seismic and geological hazards. The experimental results show that this method can monitor the vertical ground subsidence and deformation of seismic and geological hazards under different conditions, and the monitoring efficiency and cost are superior to GPS and inertial monitoring methods, and the practical application value is high.
Highlights
Land subsidence and deformation is a geological phenomenon in which the surface rock and soil subsides downward under the action of natural or manmade factors and forms a subsidence pit on the ground
In order to verify the correctness of the results of the proposed method in monitoring the vertical land subsidence and deformation in seismic and geological hazards, the results of soil subsidence and deformation monitored by the proposed method under working conditions 1 and 4 are compared with the measured soil subsidence
The ground is usually used for a long time, often affected by various loads and external seismic and geological disasters
Summary
Land subsidence and deformation is a geological phenomenon in which the surface rock and soil subsides downward under the action of natural or manmade factors and forms a subsidence pit on the ground. Artificial subsidence deformation refers to the surface subsidence deformation caused by overexploitation of groundwater and drainage of mine pits. The underground of most cities is densely covered with various pipelines, tunnels, and other underground “holes” (Tan et al, 2016). These underground “voids” are prone to collapse and cause land subsidence and deformation under the action of external factors such as ground load and disturbance of underground engineering construction
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