Simulation system for top plate breaking process after layered salt rock water-dissolving mining

Abstract

The invention discloses a simulation system for a top plate breaking process after layered salt rock water-dissolving mining. The simulation system comprises a material box of a rectangular structure,wherein the front side surface and the top surface of the material box are under an open state and are independently correspondingly movably provided with a front surface plate and a cover plate; theperiphery of the top surface of the cover plate is provided with a vertical baffle plate; the baffle plate is provided with threaded holes at equal intervals; the inner side of the lower part of thematerial box is thickened to form a step-shaped supporting structure; the top edges of the rear side surface, the left side surface and the right side surface of the material box are independently provided with round holes at equal intervals; the left side surface thickening part and the right side surface thickening part of the material box and the front side of the bottom surface of the material box are independently provided with round holes at equal intervals; the periphery of the front surface plate is provided with round holes; the material box, the cover plate and the front surface plate are connected through fastening bolts; a rock cavity is arranged between a simulated upper rock covering layer, and a pressure-resistant water bag is placed above the simulated upper rock coveringlayer; the rock cavity is provided with an insertion hole; one end of a cavity body water injection pipe is inserted into the rock cavity, and the other end penetrates through the simulated upper rockcovering layer and the cover plate in sequence to be connected with a brine pressurization device; the pressure-resistant water bag is connected with a water bag water injection pipe; and the water bag water injection pipe penetrates through the cover plate to be connected with a water pressure pressurization device.

Description

technical field [0001] The present invention relates to the technical field of rock mass simulation test, and more specifically relates to a simulation system for the roof failure process of layered salt rock after water-solution mining. The failure process of the cavity roof after mining. Background technique [0002] my country's salt rock formations have layered characteristics and are thin in thickness. In order to improve the production efficiency, the double-well convection mining method is widely used. It has the advantages of large production capacity, fewer downhole accidents and improved recovery rate. Most of the abandoned salt caverns formed are horizontal cavities with larger spans, which can easily cause surface subsidence or even subsidence. [0003] Abandoned salt caverns can be used to store oil, natural gas and compressed air energy storage if they are properly transformed. Compared with the traditional pear-shaped cavity, when the thickness of the salt la...

AI Technical Summary

Problems solved by technology

Compared with the traditional pear-shaped cavity, when the thickness of the salt layer is constant, the biggest advantage of the horizontal cavity is that it has a larger volume. However, the roof span of the horizontal cavity is larger, and it is easier to scrap the storage due to the unstable roof.

In addition, due to the lack of planning in the early stage, protection measures such as oil cushions and air cushions were not adopted, resulting in many cavity roofs being directly exposed to brine

Under the long-term action of brine, the mechanical properties of the roof will be weakened to a certain extent, and the instability of the layered roof will be aggravated to a certain extent.

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