Multi-field information monitoring method for physical model of landslide evolution process

Abstract

A multi-field information monitoring method for a physical model of landslide evolution process includes firstly, manufacturing a landslide physical model in a test frame by an existing method; secondly, every time when a designed laying position is reached, installing a series of earth pressure cells vertically, and continuing manufacturing until the model is completed; thirdly, embedding at least one row of steel balls on the side of the model; fourthly, installing a high-speed camera right in front of the model and debugging; installing an infrared thermal imager on the side of the model and debugging; and installing three-dimensional laser scanners on the front surface and the side of the model respectively and debugging; fifthly, starting a test, acquiring stress field data by the three-dimensional laser scanners and the high-speed camera, and acquiring temperature field data by the infrared thermal imager; sixthly, finishing the test, removing each instrument, and cleaning the steel balls on the side wall of the test frame; and seventhly, cleaning the model and taking out the earth pressure cells.

Description

technical field [0001] The invention belongs to the field of geological disaster model tests, in particular to a method for monitoring multi-field information of a physical model of a landslide evolution process. Background technique [0002] The geological evolution process of landslides includes the entire cycle of landslide activities from gestation, development to extinction. Research on the evolution process of landslides is of great importance for the understanding of the geological transformation of landslides in different periods, the prediction of development and change trends, and the design of engineering control measures. meaning. [0003] At present, the main methods for studying the evolution process of landslides can be summarized as the engineering geological deduction method based on the field monitoring data and the qualitative analysis of field geological phenomena, the numerical analysis method of constructing an ideal mathematical model for quantitative ...

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Problems solved by technology

[0009] Although the improvement of the current measurement technology level has promoted the development of landslide physical model test research methods to a certain extent, but considering the above-mentioned multiple landslide physical model test methods or systems, it is found that there are certain limitations or defects:

[0010] (1) The landslide evolution process has the evolution characteristics of multiple fields such as displacement field, stress field, and temperature field. The research on the landslide evolution process based on the landslide physical model test can reflect the multi-field evolution characteristics in a short time, but the traditional measurement method only Able to conduct preliminary research on the evolution process of landslides from two aspects of displacement field and stress field, ignoring other important accompanying phenomena in the evolution process of landslides;

[0011] (2) The traditional displacement measurement method cannot record the failure process of the landslide in detail, and it is difficult to reflect the crack expansion and deformation process of the landslide model;

[0012] (3) Ordinary digital camera methods have low image acquisition efficiency and high difficulty in image processing, requiring a lot of manpower, material resources and time for data processing;

[0013] (4) Ordinary digital camera technology can only obtain two-dimensional graphics of the landslide surface, and cannot establish a three-dimensional model of the landslide physical model change process, which is not convenient for intuitive observation and analysis of the deformation characteristics of each stage of the landslide physical model evolution process;

[0014] (5) The displacement data of the wading section of the landslide cannot be collected by the ordinary digital camera method, and the data of the wading section of the landslide is missing, which will affect the analysis of the evolution process of the landslide under the action of the reservoir water level;

[0015] (6) Limited by the size of the displacement sensor, the measured displacement data cannot accurately represent the absolute displacement inside the landslide, so it is difficult to accurately measure the absolute displacement of each point inside the landslide physical model;

[0016] (7) In the landslide physical model test, the position of the sliding zone and the sliding surface is generally determined according to the prototype landslide, but for homogeneous soil (or rock) landslides, no method for determining the position of the sliding surface has been proposed;

[0017] (8) When monitoring the change law of earth pressure, the embedding position of the earth pressure cell needs to be precisely controlled, but it is difficult to ensure the accuracy of the embedding height when the earth pressure cell is buried by the traditional method

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