Design and Testing of Inertial System for Landslide Displacement Distribution Measurement

Abstract

Landslide displacement monitoring plays a fundamental role in the study of landslide evolution mechanisms, forecasting, risk assessment, prevention, and control. To fill the deficiencies of traditional instrumentation for measuring landslide displacement distributed along lateral direction, a landslide displacement measurement method based on deformation-coupled pipeline trajectory measurement is proposed, and a pipeline trajectory inertial measurement instrument is developed. The developed instrument, primarily comprised of a single shaft gyro, two axis accelerometers, and an external roller encoder, is designed as an axial half strapdown-radial half platform structure combined with a mechanical gravity platform. This structure avoids the singularity of pitch angle and roll angle and can expediently calculate a pipeline trajectory with an Eulerian transformation when obtaining several basic physical variables, e.g., the axial linear velocity, pitch angle, roll angle, and azimuth angle. Additionally, the pipeline trajectory, measured at different times, possesses the ability to reflect the displacement evolution feature of landslides. The results of prototype simulation tests imply a single measurement accuracy of a 12 cm/100 m span and a singly periodic multiple (more than five times) measurement accuracy of a 3 cm/100 m span, which meets medium-precision displacement measurement requirements for a landslide. Additionally, the finished instrument has been successfully applied to the deformation monitoring of the Majiagou I# landslide, which further verifies its feasibility and offers a reference for similar landslides.

Three-Dimensional Measuring Device and Method of Underground Displacement Based on Double Mutual Inductance Voltage Contour Method

“…To fully evaluate the effectiveness and accuracy of the measurement model, a series of comparative experiments between the measured displacement and the actual displacement have been conducted on the self-designed underground displacement three-dimensional measurement experimental device. The experimental results show that the maximum errors of horizontal displacement and vertical displacement based on the proposed measurement model are less than 1 mm in the inter-axis angle range from 0 • to 80 • , which has higher measurement accuracy and reliability compared with other underground displacement monitoring technologies [4,20] and meets the accuracy and reliability requirements of landslide displacement monitoring.…”

“…By comparison, underground displacements can more accurately analyze the internal deformation characteristics of rock and soil mass, understand the landslide's real evolution, and obtain the local deformation of the entire landslide body. Therefore, underground displacement monitoring is more effective than surface displacement monitoring in predicting the trend of landslides [20].…”

“…The sliding inclinometer needs to pre-bury the inclinometer tube and drive the inclinometer probe with a guide sliding wheel to detect section by section in the inclinometer tube. Zhang et al [20] proposed a landslide displacement measurement method based on deformation-coupled pipeline trajectory measurement, which has been successfully applied to the deformation monitoring of the Majiagou landslide. Fixed inclinometer and sliding inclinometer have advantages and disadvantages; the former is more costly but can realize automatic measurement.…”

Simulation of Land Movement Detection System Using Accelerometer Sensors and Fiber Optic

“…Many land movement monitoring systems have been developed, including the use of Linear Variable Differential Transformer (LVDT) sensors [3,4], accelerometer sensors [5][6][7][8][9], fiber optic [10][11][12][13], extensometer [14,15], and inclinometer [16][17][18][19][20][21]. However, some of these studies, such as [6] dan [9] were more focused on reviewing the angular slope of each axis due to the land movement and testing systems.…”