Seepage instability water inrush experiment device and method for internal filling medium of fissure and fault type geological structures

Abstract

The invention discloses a seepage instability water inrush experiment device and method for an internal filling medium of fissure and fault type geological structures. The device comprises a test bench, a seepage experiment system, an axial pressure loading system, a hydraulic pressure loading system, an information monitoring system, a particle collection system and a flow monitoring system. In the invention, by virtue of the design of a seepage chamber, spatial characteristics of geological structures, such as fissures and faults, can be effectively reflected, and a test sample does not adopt a cylindrical shape, thereby accurately revealing the evolution characteristics and disaster-causing mechanisms of seepage instability water inrush of the internal filling medium of the geological structures; the seepage experiment system can freely rotate and can carry out a seepage instability water inrush experiment of the filling medium in different seepage directions; and the seepage chamber adopts semi-transparent or transparent side walls which are visualized, so that the change characteristics of the test sample in the experiment can be observed.

Description

technical field [0001] The invention relates to a fissure-fault type geological structure, in particular to an experimental device and method for seepage instability and water inrush of a filling medium inside a fissure-fault type geological structure. Background technique [0002] Tunnels involve traffic engineering (railways, highway tunnels), water conservancy and hydropower engineering (water delivery tunnels, underground powerhouses) and other important engineering fields, and have gradually become an important part of the country's major infrastructure projects. In the planning of strategic scientific and technological development, the focus of major engineering construction is gradually shifting to the western mountainous areas and karst areas with extremely complex topographic and geological conditions. " and other significant features of high-risk tunnel projects. Due to the concealment and variability of the geological environment and the complexity of constructio...

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Problems solved by technology

[0004] Although some scholars have studied the hydraulic properties of the above-mentioned filling media, the previous studies were mainly aimed at projects such as dams and embankments, and did not focus on the seepage instability mechanism of filling media in geological structures such as cracks and faults. Corresponding research, and the test samples in the dam and embankment test projects are all cylindrical; for the seepage instability mechanism of the filling medium in geological structures such as cracks and faults, continuing to use cylindrical samples cannot reflect the spatial characteristics of such geological structures; In addition, previous studies mainly focus on the seepage instability mechanism of filling media under the condition of vertical upward or vertical downward flow, but there are few studies on the seepage instability mechanism of filling medium under other seepage directions.

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