A device and method for simulating a water source for a coal mining process roof separation

Abstract

The application provides a coal mining process roof separation water source simulation device and experimental method, and belongs to the technical field of coal mine water inrush disaster similar material physical simulation, and comprises an aquifer similar material and a water supply assembly; the aquifer similar material is a rectangular type; the water supply assembly is embedded in the aquifer similar material and comprises a water inlet pipe, a water outlet pipe, branch water supply pipes and branch pipe heads; the branch water supply pipes are arranged at equal intervals, the strength of the branch water supply pipes is lower than that of the aquifer similar material; two branch pipe heads are arranged at two ends of the branch water supply pipes respectively, and the two ends of each branch water supply pipe are in sealed connection with the branch pipe heads respectively; the water inlet pipe and the water outlet pipe are in sealed connection with the two branch pipe heads respectively, and the water inlet pipe and the water outlet pipe extend out of the aquifer similar material. When the roof separation space is formed, the application can realize automatic water filling of the space to simulate water source gathering, and the water source will not leak through other ways.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of physical simulation of water inrush disaster of coal mine, and specifically discloses a device and method for simulating water source of roof separation water filling in a coal mining process. BACKGROUND

[0002] The coal mining process can cause the formation of cracks along the interface direction near the interface between different lithology of overlying strata of coal seam, leading to separation, deformation and displacement between different lithology, and forming a certain spatial scale and relatively stable closed space, i.e. separation space, which can become a gathering place of underground water.

[0003] Patent application publication No. CN 109470624 A discloses a system for simulating water filling and permeation of overlying strata separation, which simulates water source of roof separation water filling by injecting water into the water outlet hole of a serpentine pipe buried in the aquifer similar material.

[0004] Therefore, there is an urgent need to design a device and method for simulating water source of roof separation water filling that can overcome the above-mentioned defects. SUMMARY

[0005] The present application aims to provide a device and method for simulating water source of roof separation water filling in a coal mining process, which can automatically fill water in the space after the formation of roof separation space to simulate water source gathering, and prevent water from leaking through other channels.

[0006] The water source simulation device for roof separation and water filling in the coal mining process comprises aquifer similar material and a water supply assembly; the aquifer similar material is rectangular; the water supply assembly is embedded in the aquifer similar material and comprises a water inlet pipe, a water outlet pipe, branch water supply pipes and branch pipe heads; the branch water supply pipes are arranged at equal intervals and parallel to the long side of the aquifer similar material, and the strength of the branch water supply pipes is lower than that of the aquifer similar material; the branch pipe heads are arranged at two ends of the branch water supply pipes respectively and parallel to the short side of the aquifer similar material, and the two ends of each branch water supply pipe are sealingly connected to the branch pipe heads respectively; the water inlet pipe and the water outlet pipe are sealingly connected to the two branch pipe heads respectively, and the water inlet pipe and the water outlet pipe extend out of the aquifer similar material.

[0007] Further, the water inlet pipe and the branch pipe head are integrally formed, the water outlet pipe and the branch pipe head are integrally formed, and the two ends of the branch water supply pipe are sealingly connected to the branch pipe heads through rubber sleeves respectively.

[0008] Further, the water inlet pipe and the water outlet pipe are connected to the water supply pressure stabilizing assembly respectively.

[0009] Further, the water supply assembly is embedded at the middle position of the aquifer similar material.

[0010] Further, the outer diameter of the branch water supply pipe is within 0.5 cm, and the thickness of the aquifer similar material is more than 3 times the outer diameter of the branch water supply pipe.

[0011] Further, the aquifer similar material is mixed by sand, gypsum and a binder.

[0012] The water source simulation experiment method for roof separation and water filling in the coal mining process comprises the following steps.

[0013] S1, assembling the water supply assembly

[0014] The branch water supply pipe is inserted into the branch pipe head for sealing connection, the water inlet pipe and the water outlet pipe are connected to the water supply pressure stabilizing assembly respectively, and whether the water supply assembly connection is leaked is checked by water injection, and if leakage occurs, the sealing treatment is performed by glue injection.

[0015] S2, preparing the water filling water source and aquifer simulation device

[0016] The size of the water filling water source simulation device is determined according to the size of the test box, so that the size of the test box and the size of the aquifer similar material are the same, the aquifer similar material is first laid to half the thickness, cured, then the water supply assembly is laid flat on the cured aquifer similar material, and the other half of the aquifer similar material is laid, and cured after the laying is completed.

[0017] S3, laying other similar materials

[0018] In the test box, the coal seam, the overburden water-resisting layer similar material are laid in turn from bottom to top according to the designed thickness, and cured.

[0019] S4, laying water-filled aquifer simulation device to simulate water-filled aquifer

[0020] The maintained aquifer similar material is laid on the overburden water-resisting layer similar material, the distance between the aquifer similar material and the coal seam is arranged in the overburden breaking range in the coal mining process, so that the aquifer similar material is ensured to be broken under the influence of the coal mining, and other similar materials are continuously laid on the upper part of the aquifer similar material according to the experimental design height, so as to apply the top load and maintain;

[0021] S5, formal experiment

[0022] The branch water supply pipe is injected with water according to the water pressure requirement of the experimental design, and the water pressure of the inlet pipe and the outlet pipe is kept stable;

[0023] The coal seam is simulated to be excavated step by step, the similar materials in a certain range of the overburden strata above the coal seam are broken, displaced and collapsed, when the separation space is generated between the water-resisting layer similar material and the aquifer similar material, the aquifer similar material is also broken, and the branch water supply pipe is broken and leaks, so that the separation water-filled water source is simulated.

[0024] In the above-mentioned coal mining process roof separation water-filled water source simulation experiment method, when a plurality of water-filled water source simulation devices are arranged in an accumulated manner to simulate the aquifer, the single-layer aquifer similar materials are broken, so that the separation space inside the aquifer is simulated to be filled with water.

[0025] The present application has the following beneficial effects:

[0026] The present application has the following beneficial effects: BRIEF DESCRIPTION OF DRAWINGS

[0027] In order to more clearly illustrate the specific embodiments of the present application or the technical solutions in the prior art, the following will briefly introduce the drawings needed to be used in the specific embodiments or prior art description. Obviously, the drawings in the following description are some embodiments of the present application, and those skilled in the art can also obtain other drawings according to these drawings without creative labor.

[0028] Figure 1 It is a side view of the coal mining process roof separation water-filled water source simulation device.

[0029] Figure 2 It is a side view of the coal mining process roof separation water-filled water source simulation device. Figure 1 It is a side view of the coal mining process roof separation water-filled water source simulation device.

[0030] In the figure: 1 - aquifer similar material; 2 - water inlet pipe; 3 - water outlet pipe; 4 - rubber sleeve; 5 - branch water supply pipe; 6 - branch pipe head. DETAILED DESCRIPTION

[0031] The technical solutions of the present application will be described clearly and completely below in conjunction with the drawings. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of protection of the present application.

[0032] Embodiment 1

[0033] The present embodiment provides a roof separation water filling source simulation device in a coal mining process, which comprises an aquifer similar material 1 and a water supply assembly.

[0034] The aquifer similar material 1 is mixed by sand, gypsum and a binder.

[0035] The water supply assembly comprises a water inlet pipe 2, a water outlet pipe 3, branch water supply pipes 5, branch pipe heads 6 and rubber sleeves 4. Both ends of the branch water supply pipes 5 are connected by the rubber sleeves 4 between the two groups of branch pipe heads 6, which plays a sealing role. The two branch pipe heads 6 are connected with the water inlet pipe 2 and the water outlet pipe 3 respectively. The water inlet pipe 2 and the water outlet pipe 3 are connected with the water supply pressure stabilizing assembly to keep the water pressure in the branch water supply pipes 5 stable. The water inlet pipe 2, the water outlet pipe 3 and the branch pipe heads 6 are made of the same material with high strength to prevent rupture and water leakage during the experiment. The branch water supply pipes 5 have lower strength than the aquifer similar material 1, so that when the aquifer similar material 1 breaks, the branch water supply pipes 5 will break and leak water immediately to form a separation water filling source.

[0036] When the aquifer similar material 1 is processed, the water supply assembly is buried therein, the branch water supply pipes 5 are parallel to the long side of the aquifer similar material 1, the branch pipe heads 6 are parallel to the short side of the aquifer similar material 1, and a certain length of the water inlet pipe 2 and the water outlet pipe 3 are reserved.

[0037] Embodiment 2

[0038] The present embodiment provides a simulation experiment method of a roof separation water filling source in a coal mining process, which specifically comprises the following steps.

[0039] (1) Assemble the water supply assembly. Insert the branch water supply pipes 5 into the rubber sleeves 4 in the branch pipe heads 6 for connection, connect the water inlet pipe 2 and the water outlet pipe 3 to the water supply pressure stabilizing assembly, check whether the connection of the water supply assembly leaks by water injection, and perform sealing treatment by glue if leakage occurs.

[0040] (2) Preparation of water-filled water source and aquifer simulation device. The size of the water-filled water source simulation device is determined according to the size of the experimental box, so that the size of the experimental box and the size of the similar material 1 are the same, the branch water supply pipe 5 is selected to be a thin pipe with an outer diameter within 0.5 cm, and the thickness of the aquifer similar material 1 is more than 3 times the thickness of the branch water supply pipe 5; the mixture of sand, gypsum and binder is spread in a rectangular mold as the aquifer similar material 1, so that the aquifer similar material 1 has a certain strength; the aquifer similar material 1 is first spread to half the thickness, and then cured for 24 hours, and then the water supply assembly is spread on the cured aquifer similar material 1, and the other half of the aquifer similar material 1 is spread, and then cured for 24 hours. If the thickness of the single-layer water-filled water source simulation device is too small to meet the experimental requirements, multiple water-filled water source simulation devices can be prepared to meet the thickness requirements in a cumulative manner.

[0041] (3) Spreading other similar materials. In the test box, the coal seam and the overburden water-resisting layer similar material are spread in turn from bottom to top according to the designed thickness, and cured for 48 hours.

[0042] (4) Laying the water-filled water source simulation device to simulate the water-filled aquifer. The cured aquifer similar material 1 is spread on the overburden water-resisting layer similar material, and the distance between the aquifer similar material 1 and the coal seam is set within the range of the overburden rock failure during mining, so as to ensure that the aquifer similar material 1 is affected by mining and breaks to a certain extent. Other similar materials are laid on the top of the aquifer similar material 1 according to the experimental design height to apply the top load, and cured for 24 hours.

[0043] (5) Formal experiment. The branch water supply pipe 5 is filled with water according to the water pressure requirement of the experimental design, and the water pressure of the inlet pipe 2 and the outlet pipe 3 is kept stable. After simulating the step-by-step excavation of the coal seam, the similar material in a certain range of the overburden rock layer above the coal seam breaks, displaces and collapses, so that the separation space between the overburden water-resisting layer similar material and the aquifer similar material 1 is generated. When the aquifer similar material 1 also breaks, the branch water supply pipe 5 breaks and leaks, which can simulate the separation water-filled water source; alternatively, when multiple water-filled water source simulation devices are used to simulate thick aquifers in a cumulative manner, the breaking of multiple single-layer aquifer similar materials 1 can also simulate the process of water filling in the separation space inside the aquifer.

[0044] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, and are not limited thereto; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that the technical solutions described in the foregoing embodiments can still be modified, or some or all of the technical features can be replaced by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A device for simulating roof delamination water supply during coal mining, characterized in that, Including aquifer-like materials and water supply components; The aquifer-like material is rectangular; The water supply components are embedded in a similar material to the aquifer and include an inlet pipe, an outlet pipe, branch water supply pipes, and branch pipe heads; Multiple branch water supply pipes are set at equal intervals and are parallel to the long side of the aquifer-like material. The strength of the branch water supply pipes is lower than that of the aquifer-like material. Two branch pipe heads are respectively set at both ends of the branch water supply pipe, parallel to the short side of the aquifer-like material, and both ends of each branch water supply pipe are sealed and connected to the branch pipe head. The inlet pipe and outlet pipe are respectively sealed and connected to two branch pipe heads, and the inlet pipe and outlet pipe extend out of the aquifer-like material; Inside the test chamber, similar materials for the coal seam and the overlying aquifer were laid sequentially from bottom to top according to the designed thickness and cured. The cured aquifer similar material was then laid on top of the overlying aquifer similar material. The distance between the aquifer similar material and the coal seam was set within the range of overlying fracturing during the coal mining process. Other similar materials were laid on top of the aquifer similar material according to the experimental design height to apply a top load and cure. Water was injected into the branch water supply pipes according to the experimental design water pressure requirements to maintain stable water pressure in the inlet and outlet pipes. The coal seam was simulated to be excavated in stages, causing the similar materials in the overlying strata above the coal seam to crack, shift, and collapse within a certain range. When a separation space was generated between the aquifer similar material and the aquifer similar material, causing the aquifer similar material to also break, the branch water supply pipe ruptured and leaked water to simulate the separation water source.

2. The roof delamination water source simulation device for coal mining as described in claim 1, characterized in that, The inlet pipe and the branch pipe head are integrally formed, and the outlet pipe and the branch pipe head are integrally formed. The two ends of the branch water supply pipe are sealed and connected by rubber sleeve branch pipe heads.

3. The roof delamination water source simulation device for coal mining as described in claim 2, characterized in that, The inlet and outlet pipes are connected to the water supply pressure stabilizing assembly, respectively.

4. The roof delamination water source simulation device for coal mining as described in claim 3, characterized in that, The water supply components are buried in the middle of a similar material in the aquifer.

5. The roof delamination water source simulation device for coal mining according to any one of claims 1-4, characterized in that, The outer diameter of the branch water supply pipe is within 0.5 cm, and the thickness of the aquifer material is more than 3 times that of the branch water supply pipe.

6. The roof delamination water source simulation device for coal mining process according to claim 5, characterized in that, Aquifer-like materials are composed of a mixture of sand, gypsum, and binder.

7. A method for simulating the water source for roof delamination and filling during coal mining, characterized in that, Includes the following steps; S1, Assemble the water supply components Insert the branch water supply pipe into the branch pipe head for sealing connection. Connect the inlet and outlet water pipes to the water supply pressure stabilizing component respectively. Check for leakage at the connection of the water supply component by injecting water. If leakage occurs, seal it with glue. S2, Preparation of a water source and aquifer simulation device The size of the water source simulation device is determined according to the size of the test chamber, so that the size of the test chamber and the size of the aquifer-similar material are the same. Half the thickness of the aquifer-similar material is first laid and cured. Then the water supply component is laid flat on the cured aquifer-similar material, and the other half thickness of the aquifer-similar material is laid. After the laying is completed, it is cured. S3, Laying other similar materials Inside the test chamber, similar materials such as coal seam and overburden waterproof layer are laid from bottom to top according to the designed thickness and then cured. S4, Laying a water-filled water source simulation device to simulate a water-filled aquifer. The cured aquifer-like material is spread on top of the overburden aquitard-like material. The distance between the aquifer-like material and the coal seam is set within the overburden fracture range during the coal mining process to ensure that the aquifer-like material will definitely fracture due to the impact of coal mining. Other similar materials are then laid on top of the aquifer-like material according to the experimental design height to apply top load and carry out curing. S5, Formal Experiment Fill the branch water supply pipes with water according to the water pressure requirements of the experimental design, and keep the water pressure of the inlet and outlet pipes stable. The process simulates the step-by-step excavation of a coal seam, causing similar materials in the overlying rock strata to fracture, shift, and collapse within a certain range. This creates a separation space between similar materials in the aquifer and the water-bearing strata. When the similar materials in the water-bearing strata also break, it causes the branch water supply pipe to rupture and leak, thus simulating the separation and filling of the water source.

8. The method for simulating the water source for roof delamination and filling during coal mining as described in claim 7, characterized in that, When simulating an aquifer by accumulating multiple water-filling source simulation devices, the breakage of similar materials in multiple single-layer aquifers can simulate the process of creating a delamination space and filling it with water inside the aquifer.

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