CN-116025417-B - Coal roadway compressed air reservoir test method

CN116025417BCN 116025417 BCN116025417 BCN 116025417BCN-116025417-B

Abstract

The invention relates to a coal roadway compressed air reservoir test method which comprises the following steps of placing a lining structure model with a detection element on the inner side surface on a stratum model, blocking two ends of the lining structure model by using blocking components, surrounding rock damage areas outside the lining structure model Zhou Tianzhu, wherein each surrounding rock damage area comprises a plurality of surrounding rock blocks filled by surrounding rock similar materials, gaps between adjacent surrounding rock blocks are filled with crack layers, the detection element is embedded in the surrounding rock blocks in the filling process, an upper surrounding rock area is filled outside the surrounding rock damage areas, water seepage is introduced into the top of the upper surrounding rock area, and air inflation and air deflation are carried out on an air reservoir inside the lining structure model, so that parameters detected by the detection element are recorded.

Inventors

LI SHUCAI
WANG MENG
XU XIANJIE
LIU RENTAI
LIU PENG
BAI JIWEN
ZHANG CHUNYU

Assignees

山东大学

Dates

Publication Date: 20260512
Application Date: 20221208

Claims (9)

1. The coal roadway compressed air reservoir test method is characterized by comprising the following steps of: placing a lining structure model with a detection element on the inner side surface on the stratum model, and plugging two ends of the lining structure model by using plugging components; The method comprises the steps that a surrounding rock damage area is formed outside a lining structure model Zhou Tianzhu, the surrounding rock damage area comprises a plurality of surrounding rock blocks filled by surrounding rock similar materials, gaps between adjacent surrounding rock blocks are filled with crack layers, and detection elements are buried in the surrounding rock blocks in the filling process; Filling an upper surrounding rock area outside the surrounding rock damage area; Introducing seepage water into the top of the upper surrounding rock area, inflating and deflating a gas storage in the lining structure model, and recording parameters obtained by detection of the detection element; The inner surface of the lining structure model is provided with a sealing layer, and the inner surface of the sealing layer is provided with a distributed optical fiber and a stress meter which are used as detection elements of the inner surface of the lining structure model; the plugging assembly adopts a concrete air plug poured at the end part of the lining structure model, wherein the concrete air plug at one end is provided with an air inlet hole and an air outlet hole; and a water tank is placed at the top of the upper surrounding rock area, water is contained in the water tank, and a water through hole is formed in the bottom wall of the water tank so as to realize that the upper surrounding rock area of the tank is filled with water.
2. The coal roadway compressed air reservoir test method of claim 1, wherein the sealing layer comprises a first sealing layer positioned on the inner surface of the lining structure model and a second sealing layer positioned on the surface of the first sealing layer, the first sealing layer is made of phenolic foam material or B1-grade polyurethane spraying heat-insulating material or foaming cement, and the second sealing layer is made of steel plate or butyl rubber or ethylene propylene diene monomer rubber or natural rubber or glass fiber reinforced plastic.
3. The coal roadway compressed air reservoir test method of claim 1, wherein for a fracture layer which is horizontal or forms an acute angle with the horizontal, firstly filling surrounding rock blocks below the fracture layer, then placing a fracture template above the filled surrounding rock blocks and compacting the fracture template to form a surface along the shape of the fracture, then removing the fracture template, paving a fracture similar material to form a fracture layer, and then filling surrounding rock blocks above the fracture layer; for the vertical fracture layer, firstly placing a fracture template, then filling surrounding rock blocks on two sides of the fracture template, taking out the fracture template, and then blowing in a fracture similar material to form the fracture layer.
4. The method for testing a compressed air storage in a coal roadway according to claim 1, wherein when the surrounding rock damaged area is filled, filling all surrounding rock blocks is completed, a crack template is arranged between adjacent surrounding rock blocks, and then the crack template is pulled out from one side along the longitudinal direction of the lining structure model, and simultaneously, a crack similar material is blown into the other side.
5. The method for testing the compressed air reservoir in the coal roadway according to claim 1, wherein when the surrounding rock damaged area is filled, filling all surrounding rock blocks is completed, a crack template is arranged between adjacent surrounding rock blocks, the crack template is made of a water-soluble supporting material, the crack template is drilled and injected with water, the crack template is gradually ablated, and meanwhile, a crack similar material is blown in.
6. The coal roadway compressed air reservoir test method of claim 1, wherein an expansion membrane bag is arranged between the concrete air plug and the inner side surface of the end part of the lining structure model, cement-water glass rapid hardening slurry is injected into the expansion membrane bag after the concrete air plug is poured, and the expansion membrane bag is expanded to seal between the concrete air plug and the inner side surface of the lining structure model.
7. The coal roadway compressed air reservoir test method of claim 1, wherein the air charging and discharging mechanism is used for charging and discharging air into the lining structure model, the air charging and discharging mechanism comprises a compressed air supply element, the compressed air supply element is connected with one end of an air inlet pipe, the other end of the air inlet pipe extends into the lining structure model through an air inlet hole, an air outlet pipe is fixed at the air outlet hole, the air outlet pipe is used for communicating the lining structure model with the external space, and valves are arranged on the air inlet pipe and the air outlet pipe.
8. The method for testing a compressed air storage in a coal roadway of claim 1, wherein the detecting elements in the surrounding rock block are a plurality of osmometers and stress gauges.
9. A method of testing a coal roadway compressed air reservoir as recited in claim 1, wherein a heating element is mounted within said tank.

Description

Coal roadway compressed air reservoir test method Technical Field The invention relates to the technical field of compressed air energy storage, in particular to a coal roadway compressed air reservoir test method. Background The underground gas storage mainly adopts depleted oil and gas reservoirs and salt caves for building, has good tightness and low building cost, but depends on special geological structures and is difficult to popularize in first-line cities on a large scale. If the existing abandoned mine tunnel is transformed into a compressed air reservoir, the deep application of the energy storage technology is further enhanced, clean transformation of the energy structure is promoted, a power grid friendly power supply with self peak clipping and valley filling capability and stable output is formed, and the economic benefit is remarkable. The waste mine tunnel reconstruction is considered to meet the requirements of salt tunnel construction, and the waste mine tunnel reconstruction comprises the air tightness, stability and durability of the air storage. The thermodynamic changes associated with air compression, storage and release affect the temperature, stress and deformation of the seal layer, liner and surrounding rock structures. Different from a newly built hard rock chamber, in a typical inflation and deflation operation mode, the waste mine tunnel is reformed into a reservoir with specificity. The method is characterized in that the damage area of surrounding rock of the abandoned coal mine tunnel is obvious, the stability problem of the abandoned tunnel applied to compressed air energy storage is to be solved, the influence of accumulated water leakage on the operation of the storage is to be considered, the problem of local damage of a sealing layer caused by defects such as lining cracking and the like is not solved, and the temperature of the storage is lower than zero ℃ after the compressed air is released and is in a negative temperature state. The key scientific problems encountered in the construction and operation and maintenance of the coal roadway energy storage warehouse are required to be researched through a large-scale test, but the corresponding test means are missing at present, and the mechanistic problems encountered in the process of modifying the coal roadway into the compressed air warehouse cannot be revealed. Disclosure of Invention Aiming at the defects existing in the prior art, the invention aims to provide a coal roadway compressed air reservoir test method, which can reveal the mechanistic problems encountered in the process of modifying a coal roadway into a compressed air reservoir through test means. In order to achieve the above object, the present invention is realized by the following technical scheme: The embodiment of the invention provides a coal roadway compressed air reservoir test method, which is characterized by comprising the following steps of: placing a lining structure model with a detection element on the inner side surface on the stratum model, and plugging two ends of the lining structure model by using plugging components; The method comprises the steps that a surrounding rock damage area is formed outside a lining structure model Zhou Tianzhu, the surrounding rock damage area comprises a plurality of surrounding rock blocks filled by surrounding rock similar materials, gaps between adjacent surrounding rock blocks are filled with crack layers, and detection elements are buried in the surrounding rock blocks in the filling process; Filling an upper surrounding rock area outside the surrounding rock damage area; and (3) introducing seepage water into the top of the overlying surrounding rock area, inflating and deflating a gas storage in the lining structural model, and recording parameters obtained by detection of the detection element. Optionally, a sealing layer is arranged on the inner surface of the lining structure model, and distributed optical fibers and stress meters are arranged on the inner surface of the sealing layer and used as detection elements of the inner surface of the lining structure model. Optionally, the sealing layer comprises a first sealing layer positioned on the inner surface of the lining structure model and a second sealing layer positioned on the surface of the first sealing layer, wherein the first sealing layer is made of phenolic foam material or B1-level polyurethane spraying heat-insulating material or foaming cement, and the second sealing layer is made of steel plate or butyl rubber or ethylene propylene diene monomer rubber or natural rubber or glass fiber reinforced plastic. Optionally, for a layer of crack material in a horizontal direction or at an acute angle to the horizontal direction, firstly filling surrounding rock blocks below the layer, then placing a crack template above the filled surrounding rock blocks and compacting the surrounding rock blocks to form a surface along the shape of the