Multi-operating mode frame type portable landslide testing device for geomechanical model

Abstract

A multi-operating mode frame type portable landslide testing device for a geomechanical model belongs to the field of geological hazard model test. The testing device comprises a frame-beam-type testing bed, a rainfall simulator, a water level regulator and a self-weight horizontal loading mechanism, wherein the frame-beam-type testing bed mainly comprises a cuboid framework, a front panel, a rear panel and a base plate; the rainfall simulator is arranged at the top of the frame-beam-type testing bed and comprises a plurality of spraying pipes and nozzles on the spraying pipes and is used for simulating rainfall in the frame-beam-type testing bed; the water level regulator comprises a left-side trough and a right-side trough respectively formed on the left and the right sides of the frame-beam-type testing bed, and a plurality of drainage holes are respectively formed on the right panel of the left-side trough and the left panel of the right-side trough and used for changing the water levels of water level simulation libraries in the left-side trough and the right-side trough; and the self-weight horizontal loading mechanism is arranged above the right-side trough and used for bearing weights, so as to exert horizontal load to the landslide model in the frame-beam-type testing bed.

Description

technical field [0001] The invention belongs to the field of geological disaster model tests, in particular to a multi-working-condition frame type landslide geomechanics model portable test device. Background technique [0002] The landslide model test belongs to the category of geomechanics model test, and its theory originated from the structural model test established in the early 20th century. In the 1960s, E. Fumagalli carried out a three-dimensional model failure test study on the background of the Italian Vajont hyperbolic arch dam, which is a sign of the generation of geomechanical model test technology. As early as the 1980s, domestic scholars began to use this method to make models with similar materials in the frame model tank, and based on satisfying the boundary conditions, through the analysis of monitoring data such as stress, strain, displacement, moisture content, etc., the prototype was revealed. Formation mechanism and failure mode of landslides. Since ...

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Problems solved by technology

[0011] Although the research and development of the above-mentioned landslide model test devices has promoted the development of geomechanical model test research methods to a certain extent, considering the above-mentioned multiple model test devices or systems, it is found that there are certain limitations or defects:

[0012] (1) The scale of the traditional model test device is large, which is not conducive to the fine research on the formation mechanism and failure mode of the landslide

Under the action of external load, the test frame has large lateral deflection and deformation, which may easily cause the test boundary conditions to be inconsistent with the actual situation, and the structure is heavy and complex, requiring a large site area and foundation bearing capacity, making it difficult to move

The production cycle of the entire landslide model test device is long, which consumes a lot of manpower and material resources;

[0013] (2) Most of the traditional model tests are generalized simulation models of the whole landslide model, and the similarity of the models used is relatively small. It can only conduct a macroscopic analysis of the deformation and failure process of the entire landslide, and cannot conduct detailed research on the local deformation and stress characteristics of the landslide. It is impossible to analyze the stress and strain characteristics of the implanted prevention and control engineering;

[0014] (3) The traditional model test considers only one factor, and there are few studies on landslide simulation under combined operating conditions. It is difficult to carry out research on the mechanism of landslide disaster caused by multiple factors and the overall stability of landslides after implantation of prevention and control projects;

[0015] (4) The loading of the traditional model device requires a hydraulic jack to provide force, and its control system is complicated and the operation is cumbersome, and generally requires additional design and manufacture of a counter force device;

[0016] (5) The traditional landslide model test device considering the effect of reservoir water generally sets the seepage boundary at the rear of the landslide body as the constant head boundary condition, which is inconsistent with the actual landslide seepage field

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