Use of MEMS accelerometers/inclinometers as a geotechnical monitoring method for ground subsidence

The area around the town of Northwich in Cheshire, U. K., has a long history of catastrophic ground subsidence caused by a combination of natural dissolution and collapsing abandoned mine workings within the underlying Triassic halite bedrock geology. In the village of Marston, the Trent and Mersey Canal crosses several abandoned salt mine workings and previously subsiding areas, the canal being breached by a catastrophic subsidence event in 1953. This canal section is the focus of a long-term monitoring study by conventional geotechnical topographic and microgravity surveys. Results of 20 years of topographic time-lapse surveys indicate specific areas of local subsidence that could not be predicted by available site and mine abandonment plan and shaft data. Subsidence has subsequently necessitated four phases of temporary canal bank remediation. Ten years of microgravity time-lapse data have recorded major deepening negative anomalies in specific sections that correlate with topographic data. Gravity 2D modeling using available site data found upwardly propagating voids, and associated collapse material produced a good match with observed microgravity data. Intrusive investigations have confirmed a void at the major anomaly. The advantages of undertaking such long-term studies for near-surface geophysicists, geotechnical engineers, and researchers working in other application areas are discussed.

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Use of Micro-electromechanical Systems Inertial Sensors as a Geotechnical Monitoring Method for Slope Deformation

IAEG/AEG Annual Meeting Proceedings, San Francisco, California, 2018 - Volume 1 ◽

10.1007/978-3-319-93124-1_30 ◽

2018 ◽

pp. 253-258

Author(s):

Cheng Li ◽

Yueping Yin ◽

Shengwu Song

Keyword(s):

Inertial Sensors ◽

Slope Deformation ◽

Monitoring Method ◽

Electromechanical Systems ◽

Geotechnical Monitoring

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Monitoring Method of Longitudinal Land Subsidence and Deformation in Seismic Geological Disasters

Earth Sciences Research Journal ◽

10.15446/esrj.v24n3.90290 ◽

2020 ◽

Vol 24 (3) ◽

pp. 259-266

Author(s):

Aimei Xu ◽

Hojatallah Azarkhosh ◽

Erjun Wu

Keyword(s):

Optical Fibers ◽

Land Subsidence ◽

Confining Pressure ◽

Ground Subsidence ◽

Correction Coefficient ◽

Geological Hazards ◽

Distributed Monitoring ◽

Monitoring Methods ◽

Monitoring Method ◽

Geological Disasters

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.

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GEOTECHNICAL MONITORING DURING CONSTRUCTION IN DIFFICULT SOIL CONDITIONS

Istrazivanja i projektovanja za privredu ◽

10.5937/jaes0-31438 ◽

2021 ◽

pp. 1-5

Author(s):

Vladimir Viktorovich Bredikhin ◽

Vladimir Khaustov ◽

Dmitriy Melkumov

Keyword(s):

Urban Areas ◽

Soil Layer ◽

Ground Subsidence ◽

Soil Conditions ◽

Real Problem ◽

Construction Methods ◽

Geotechnical Monitoring ◽

Geological Processes ◽

Geological Conditions ◽

The Right

One of the common and at the same time most difficult problems that developers may face is unstable soil layer at the base of a future building. This paper describes problems of construction on weak, subsidence and heaving soils in engineering and geological conditions of Kursk city. Real problem of construction property safety is shown with the example of one of the demanding geomorphological and lithological conditions of urban areas. The paper offers a description of geologic and hydrogeological features of the slope rock mass in the right bank of the Tuskar river. Groundwater level lies at 8.7 m. depth. It is possible to predict an increase in the level of groundwater in building maintenance because this area is potentially flooded. Various engineering and geological processes and such phenomena as ground subsidence, karst, suffosia, landslides, flooding, etc., can also be found in the studied territory. Initially an insufficient engineering-geomorphological, hydrogeological, ecological and engineering-geological study of hazardous areas in the city of Kursk have led to its problematic development, which illustrates the situation with residential real estate in the studied territory. To predict dangerous engineering-geological processes and ensure the reliability of the construction fund, specific proposals have been developed for the organization of a geotechnical monitoring system based on the optimal integration of geomorphological, geodesic, engineering-geological, hydrogeological and environmental construction methods in complex engineering-geological conditions.

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