Simulation device for covered karst collapse caused by water level fluctuation

Abstract

The invention discloses a simulation device for covered karst collapse caused by water level fluctuation, and relates to the technical field of hydrogeology. The device comprises a simulation unit, the internal space of a test box body of the simulation unit is divided into a diving simulation area, a confined water simulation area and a filtering area by a first partition plate and a second partition plate, a soil body is arranged in the diving simulation area, and a karst cave simulation hole is formed in the first partition plate. A seepage cylinder coaxial with the karst cave simulation hole is arranged on the first partition plate, a first water leakage hole and a second water leakage hole are formed in the positions, located in the confined water simulation area and the filtering area, of the side wall of the seepage cylinder respectively, a piston is arranged in the seepage cylinder, and the piston sequentially comprises a plugging ring and a plugging plate from top to bottom, and a connecting rod is arranged between the plugging ring and the plugging plate. The device can be used for collecting the dropped soil body caused by each water level fluctuation, so that the development process of karst collapse is quantitatively analyzed and judged.

Description

technical field [0001] The invention relates to the technical field of hydrogeology, in particular to a simulation device for overlying karst collapse caused by water level fluctuations. Background technique [0002] Karst collapse refers to the sudden ground deformation and damage caused by the destruction of the balance of the loose soil covering the karst caves under the action of external forces or human factors, resulting in the formation of conical collapse pits. There are many reasons for karst collapse. Among them, the flow of groundwater and the change of its hydrodynamic conditions are the most important dynamic factors for the formation of karst collapse. Therefore, areas where groundwater runoff is concentrated and intense are most prone to collapse. [0003] Because the cause of karst collapse is relatively hidden, it is difficult to be found in the early stage, so karst collapse often occurs suddenly from the appearance, which will not only pose a threat to per...

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Problems solved by technology

[0005]First, since it is a qualitative observation of the change of the soil surface, it has little guiding significance for actual production

[0006]Secondly, even if the changes of the soil surface can be quantitatively observed, the process of karst subsidence is often that the soil on the lower surface of the soil falls first to form a The reverse pothole shown in Figure 22, and this The upper surface of the soil often has no change, or the change is very small, so it is difficult to observe the change of the upper surface of the soil, which is why the karst collapse is sudden

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