Geotechnical Deformation Measurement Method and Instrument System Based on Inclinometer and Hall Effect

Abstract

The invention discloses a rock and soil mass deformation measurement method and instrument system based on deviation survey and the Hall effect. A plurality of integrated sensor units are successively serially laminated and connected from bottom to top to from a measurement string to be packaged in a thermal shrinkage soft plastic pipe and to be placed in underground rock and soil mass; a centralized processing device is successively in connection with the integrated sensor units through a 485 serial port; a deviation survey MEMS (Micro-Electro-Mechanical System) circuit detects inclination angles of the integrated sensor units relative to a geometrical vertical; a Hall effect magnetic measurement circuit detects the magnetic induction intensity of the magnetic field emitted by adjacent integrated sensor units; the relative movement between two adjacent integrated sensor units and the inclination angle of each integrated sensor unit can be obtained through a measurement model, thereby obtaining underground rock and soil mass deformation states. The measurement method and instrument system do not need manual measurement, and can automatically perform real-time and continuous measurement and monitoring, measure accurately, actually reflect the underground rock and soil mass deformation states, avoid immeasurable cases, and realize automatic measurement.

Description

technical field [0001] The present invention relates to a rock and soil mass measurement method and system, in particular to a rock and soil mass deformation measurement method and instrument system based on inclinometer and Hall effect, which can be used for deep underground rock and soil mass deformation (displacement) measurement . Background technique [0002] Landslides, collapses, debris flows, landslides, ground subsidence and other geological disasters that endanger people's lives and property safety will cause deep underground displacements before and during the occurrence, and deep displacements will also occur in tailings dams during continuous accumulation. Highway and railway The slope will be displaced in the deep part of the rock mass before it collapses due to the compression of the back-to-back rock mass. During construction and water conservancy construction, deformation and displacement in the deep part of the ground will occur due to activities such as ex...

AI Technical Summary

Problems solved by technology

This kind of inclinometer must be manually operated by placing the measuring probe from top to bottom in the inclinometer tube to measure the inclination angle of the inclinometer tube. It cannot be monitored automatically in real time, and the measurement accuracy is related to the operator's technology.

[0005] In addition, when the inclinometer pipe buried in the deep part of the soil undergoes S-shaped deformation or large curvature bending, the measuring probe cannot be lowered to complete the measurement

In addition, the inclinometer tube is made of aluminum or engineering plastics, which has good anti-destructive strength. When the underground soil is soft, the actual displacement of the underground soil is greater than the displacement value corresponding to the inclination angle of the inclinometer tube. This does not accurately reflect the reality of the subsurface

[0006] Therefore, for geotechnical disasters, the existing underground deformation measurement products have at least three major defects: ① real-time measurement cannot be realized; ② when the layered movement of rock and soil makes the inclinometer tube into an S shape, the inclinometer probe cannot be placed in the inclinometer ③ The inclinometer tube is an engineering plastic tube or aluminum tube with a thickness of 3 mm and a guide groove for guiding the inclinometer probe. It is a harder tube than soft soil, so the measured movement of soft soil will be less than The actual movement of soft soil cannot accurately measure the deformation of rock and soil

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