Geotechnical engineering inclination measurement method and device based on shape memory material

Abstract

The invention relates to a geotechnical engineering inclination measuring method and device based on a shape memory material, which belongs to the technical field of geotechnical engineering monitoring. Put the measuring strip into the inclinometer tube to ensure that it can freely deform with the surrounding rock and soil, apply the shaping conditions to complete the deformation recording work, remove the shaping conditions and extract the measuring strip when it returns to the normal state , re-apply the shape-forming conditions to directly read the deformation value of the memorized shape against the scale. This method can greatly reduce the workload of monitoring operations and effectively meet the large deformation monitoring requirements of geotechnical engineering. The inclinometer device includes a drive unit, an inclinometer tube, and a shape-forming condition control module. The measuring strip is made of a shape-memory material, and the measuring strip is wrapped in a core tube. The core tube can adjust the shaping condition of the measuring strip. The inliner is built into the inclinometer tube and deforms synchronously with the inclinometer tube.

Description

technical field [0001] The invention relates to the technical field of geotechnical engineering monitoring, in particular to a geotechnical engineering inclination measuring method and device based on a shape memory material. Background technique [0002] Inclinometer technology is widely used in geotechnical engineering such as foundation pits, pile foundations, and slopes, providing powerful monitoring basis and technical support for construction safety management, quality control, and surrounding environmental protection. At present, sliding inclinometers are usually used for horizontal displacement monitoring in geotechnical engineering. This type of inclinometer is mainly composed of four parts: inclinometer tube, probe, cable and host. [0003] The working principle of the sliding inclinometer: In engineering application, the inclinometer tube is first embedded in the soil (pile, wall), and after the deformation of the soil (pile, wall), the entire inclinometer tube al...

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Problems solved by technology

[0004] 1. The workload is large; data collection is time-consuming and laborious. Generally, a single measuring hole collects a data at an interval of 0.5m or 1.0m (limited by the length of the sensor probe). At the same time, due to the existence of sensor probe offset error and zero drift error, The single data of a single measurement hole needs to collect two sets of data for positive measurement and reverse measurement for error elimination

[0005] 2. The measuring range is limited: if the rock and soil body undergoes a large deformation, the inclinometer pipe will produce excessive curvature, which will cause the sensor head to be unable to pass freely, resulting in "shearing" of the inclinometer hole. At present, although it is possible to increase the inner diameter of the inclinometer pipe To reduce the probability of the measuring tube being "cut", but increasing the inner diameter of the measuring hole will also have a "reinforcement effect" on the original formation or cause greater "defects" to the pile foundation and the enclosure structure, which will have unnecessary effects and make the monitoring Distortion occurs

[0006] 3. High failure rate: The inclinometer tube is easily blocked or damaged by debris on the construction site, and the guide groove is easily blocked by the combination of sediment, dust, water vapor, etc., resulting in restricted sliding of the guide wheel. Once these failures occur, the Difficult to check, and even cause the inclinometer tube to be scrapped directly

[0007] 4. There are many error factors: the inclinometer itself has three kinds of instrument errors: offset error, zero drift error and rotation error; the inclinometer conduit will produce conduit distortion errors during the manufacturing and installation process; during the observation process, the instrument system is affected by the environment. The influence of temperature and humidity will cause environmental errors; due to the observer's technical ability, work habits and sense of responsibility, it will cause human errors if he cannot operate the instrument correctly, make observation errors, read wrong numbers, and remember wrong values; in data processing In the process, calculation errors will occur due to improper selection of calculated reference values ​​and assumed fixed points, etc.

[0008] 5. Discrete and non-continuous data: It belongs to the measurement of equidistant discrete incremental method, the length of the measuring head determines the dispersion of monitoring data, which cannot accurately and completely describe the deformation characteristics of the formation

[0009] 6. Single direction of inclination measurement: At present, it is generally only possible to measure displacement curves in two directions, which belongs to in-plane measurement. It is suitable for situations with obvious plane deformation characteristics such as narrow and long foundation pits, but it is true for rock and soil in complex situations. Lack of monitoring capabilities for displacement characteristics;

[0010] 7. The degree of automation is low; due to the fact that there are too many human factors and accidental factors in the use of this monitoring method, there are certain difficulties in the realization of automated inclinometers based on this method

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