Fluid-solid coupling simulation material for coal series pressure-bearing fault activation water inrush similarity test and preparation method

Abstract

The invention relates to a fluid-solid coupling simulation material for a coal series pressure-bearing fault activation water inrush similarity test. The fluid-solid coupling simulation material for the coal series pressure-bearing fault activation water inrush similarity test consists of three parts, i.e., a coal seam, a fault and surrounding rock; the coal seam consists of coal powder, talcum powder, gypsum, Vaseline, silicon oil and mixing water, the fault consists of coarse sand, talcum powder, gypsum, kaolin, Vaseline, silicon oil, soybeans and mixing water, and the surrounding rock consist of fine sand, talcum powder, gypsum, kaolin, cement, Vaseline, silicon oil and mixing water, wherein the gypsum, the cement and the Vaseline are used as cementing agents, the properties that the soybeans are expanded while absorbing water and the kaolin is granulated while meeting with water are combined, the fault surrounding rock similar material is guaranteed to have certain plasticity and strength and not to be softened and collapsed when meeting with water, simultaneously the purposes of producing a fracture with displacement when the fault similar material meets with water, reducing the strength, gradually increasing the permeability, causing seepage washing and slow collapse to form a water inrush passage are realized, and the difference between fluid-solid coupling properties of the fault and the surrounding rock in the same similarity test is inversed to enable test results to be more compliant with the reality.

Description

technical field [0001] The invention relates to the technical field of a similar test for activated water inrush of a coal-measure confined fault, and more particularly relates to a fluid-solid coupling simulation material and a preparation method for a similar test for activated water inrush of a coal-measure confined fault. Background technique [0002] my country is rich in coal resources, but the geological conditions are complex, which makes geological disasters occur frequently in coal mining. With the further increase of mining depth and mining intensity, mining face is increasingly threatened by floor austrian limestone solution water, especially in mining face with fault structure, the problems of prediction and prevention of floor water inrush are more prominent. [0003] Fault activation water inrush is an important form of coal mine water inrush, which is highly concealed and difficult to determine, which is easy to cause major disasters and seriously threatens t...

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Problems solved by technology

[0008] However, the similar simulation materials prepared above cannot be used in the fluid-solid coupling similarity test of coal-measure confined fault mining activation water inrush. Slow disintegration occurs, it is difficult to meet the similarity of mechanical parameters and water rational parameters

Therefore, similar simulations of activated water inrush from coal-measure confined faults were rarely involved in previous studies, which could not reflect the catastrophic development process of faults under the action of confined water.

[0009] For this reason, the patent (201510252670.7) discloses a similar simulation material composed of talcum powder, sand, gypsum, bentonite, liquid paraffin, and an appropriate amount of water, which is used to simulate a similar test of fault mud bursting during tunnel excavation. It solves the problem of slow weakening and disintegration of similar materials under the action of water, but it cannot vividly and intuitively reproduce the dynamic process of the generation, expansion, penetration, and final activation of water-conducting channels in mining coal-measure confined faults

[0010] Further, the patent (201510432280.8) discloses a similar material for simulating water inrush in coal mining structures and its preparation and use method. The similar material uses soybeans, river sand, calcium carbonate, and gypsum as raw materials, and can indirectly realize hydraulic pressure. The influence of surrounding rocks can simulate the initiative of structural activation, and then simulate the activation of structural failure under the coupling effect and show the formation and evolution of water passages, but it cannot invert the effect of confined water on the penetration and erosion of similar materials to create cracks and the process of forming water inrush channels, let alone reflect the slow weakening and disintegration of materials with similar structures under the action of water

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