Multi-angle loose accumulation bank slope model making equipment and its test method

Abstract

The invention provides multi-angle loose accumulation bank slope model making equipment and a test method thereof. The model making device includes a model box body. The whole body of the mold box is a hollow straight triangular prism with an open side. During work, soil is filled in the inner cavity of the model box body, and loose accumulation soil blocks are formed after slope cutting and leveling work. The test method includes steps such as fixing the soil baffle, pre-determining the height of layers and the height of loose paving, filling the soil in layers and partitions, and cutting and leveling the slope. By arranging soil baffles at intervals, the device can realize the experimental research of multiple soil blocks of different materials at the same time. Through the combination of fixed baffles and detachable baffles, multiple angles can be easily changed without repeating time-consuming and laborious processes such as concrete masonry and edge trimming, which greatly shortens the experimental preparation time and simplifies the experimental procedures.

Description

technical field [0001] The invention relates to the technical fields of water conservancy engineering disasters, waterway regulation engineering and geotechnical engineering, in particular to a multi-angle loose accumulation bank slope model making equipment and a test method thereof. Background technique [0002] Disastrous landslides often occur in the Three Gorges reservoir area. Landslide surge refers to the waves caused by the sudden sliding of slope rock and soil mass and the interaction with water body. Landslide surges often cause secondary disasters to river courses and bank slopes. Swell waves acting on bank slopes may cause surface erosion and collapse, shallow landslides, and even threaten the overall stability, especially for the widely distributed earth-rock slopes in the Three Gorges Reservoir area. The subsequent material parameters decrease, which may cause secondary slope instability disasters. Therefore, the degree of impact on the bank slope when the l...

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Problems solved by technology

Physical model tests are generally carried out in water tanks, and landslide surge waves are simulated by wave generators. The problem is that wave generators have unique advantages in simulating regular waves, but there are considerable limitations in simulating irregular wave characteristics. Especially for extreme waves such as swells. Secondly, the bank slope is simulated by a smooth inclined plate, which is an idealized bank slope. Factors such as the roughness and permeability of the bank slope material are not considered, which leads to the results obtained from the test and There is a large difference in the measured values; some tests involve loose accumulation bank slopes, and the bank slope boundary is the side wall of the tank, and the required bank slope angle is directly stacked in the tank, but it can only achieve one material under one angle. the test

The other is a large-scale three-dimensional physical model test, which can do a more realistic simulation of the occurrence and impact of disasters, so it occupies an important position in the study of landslide surge tests. The simulation research of landslide materials has been obtained. It can better conform to different types of landslides to a certain extent. For the simulation of bank slopes, most of them can stay in the stage of smooth slopes. Because the Three Gorges reservoir area is mostly soil-rock slopes, smooth slopes cannot reflect soil-rock slopes. The material properties of loose accumulation bank slopes such as slopes can only roughly obtain the surface wave pressure on the bank slope, but the changes in wave force inside the soil, the erosion deformation of the soil surface, and the overall stability of the soil However, specific experimental research cannot be carried out effectively. A targeted three-dimensional physical model test on the stability of earth-rock slopes under swells can predict in advance the degree of impact on the slopes near the landslide when swells occur, so that preventive measures can be taken in advance.

Existing studies have shown that the angle of the bank slope and different accumulation materials of the bank slope are important factors affecting the force of the bank slope under the action of waves. Therefore, in the 3D physical model experiment, the first consideration is the change of the bank slope angle and the composition of different materials. impact on the test results, and large-scale three-dimensional physical model tests generally use concrete masonry bank slopes, and the bank slope sections that need to be tested are separately built according to the width, angle, and different loose accumulation soil blocks, and then the slope Plastering and correction, until the concrete frame is air-dried, the loose accumulation can be filled. This test preparation process is often laborious and lengthy. If the test involves multiple bank slope angles and various loose accumulation materials, this process consumes a lot of time. Manpower, material resources and time are immeasurable

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