Apparatus and method for coupling instability test of seepage, erosion and stress in tunnel filling structure

Abstract

The invention discloses a test device and method for seepage, erosion and stress coupling instability of a tunnel filling structure. A water source is applied to the top of a visual permeability test chamber, and seepage occurs from top to bottom under the action of a pressure gradient to simulate the internal pressure of the filling structure. Groundwater seepage state; increase seepage pressure step by step, and study the seepage-erosion-stress instability criterion of filling structure through the internal medium loss state of the sample and the distribution law of internal seepage pressure; use the sawtooth lap joint through the visual permeability test room The relative position can be changed freely within a certain range, which ensures the independence of the pressure applied in the two horizontal directions; the sawtooth-shaped lap joint between the top steel plate and the side wall can ensure the independent loading of the load, and realize the three-dimensional ground more realistically. Simulation of stress state.

Description

technical field [0001] The invention relates to a seepage, erosion and stress coupled instability test device and method for a tunnel filling structure. Background technique [0002] Water and mud inrush are the most common geological disasters encountered during tunnel construction. Major water and mud inrush accidents can easily induce ecological damage such as mountain collapse and water resource depletion, which will increase the cost of project construction, delay the construction period of the project, and cause major disasters. Economic loss and adverse social impact. Due to the rich types of water and mud inrush disasters and the extremely complex evolution process of disasters, it has been difficult to fundamentally contain them so far. [0003] In essence, water and mud inrush is that the rock and soil inside the filling structure breaks the existing equilibrium state under certain in-situ stress and seepage conditions, breaks through the final water and mud barri...

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Problems solved by technology

[0004] Previous water and mud inrush test devices often stay on the test conditions of one-dimensional or pseudo-three-dimensional ground stress. The one-dimensional test often ignores the influence of the horizontal stress of the sample. Although the pseudo-triaxial test considers the ground stress, it assumes that The ground stresses are all equal, which cannot accurately reflect the stress state of rock and soil under real geological conditions

There are very few test devices for water inrush instability of tunnel filling structures at home and abroad, especially the test devices for the study of the instability mechanism of three-dimensional filling structures are very lacking

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