阅读说明：本技术 模拟老空区煤泥水对下覆煤岩层力学作用的装置及方法 (Device and method for simulating mechanical action of old goaf slime water on underlying coal rock stratum ) 是由 姜海纳 郭栋 冯国瑞 徐乐华 宋诚 于 2019-11-11 设计创作，主要内容包括：本发明公开了一种模拟老空区煤泥水对下覆煤岩层力学作用的装置及方法,该装置包括采空区模拟缸体、进水装置、扰动装置、数据采集装置和恒温保温盖体；采空区模拟缸体一端与进水装置连接,进水装置另一端设置扰动装置,采空区模拟缸体的上方设有恒温保温盖,在采空区模拟缸体的外侧设有数据采集装置；煤颗粒样品位于采空区模拟缸体内；本发明设计使用模拟手段来还原采空区突水之前煤水混合物的作用对于突水的影响,分析不断增加的积水与残留煤混合后的煤水混合物的状态,在不同状态下对采空区下覆岩层的力学作用。(The invention discloses a device and a method for simulating mechanical action of old goaf slime water on a lower overlying strata, wherein the device comprises a goaf simulation cylinder body, a water inlet device, a disturbance device, a data acquisition device and a constant-temperature heat-preservation cover body; one end of the goaf simulation cylinder body is connected with the water inlet device, the other end of the water inlet device is provided with the disturbance device, a constant-temperature heat-preservation cover is arranged above the goaf simulation cylinder body, and a data acquisition device is arranged on the outer side of the goaf simulation cylinder body; the coal particle sample is positioned in the goaf simulation cylinder body; the invention designs and uses a simulation means to reduce the influence of the action of the coal-water mixture before water inrush in the goaf on water inrush, analyzes the state of the coal-water mixture after the continuously increased accumulated water and residual coal are mixed, and has mechanical action on the overlying strata layer under the goaf in different states.)

1. The utility model provides a device of simulation old goaf coal slime water to covering coal rock stratum mechanical action down which characterized in that: the device comprises a goaf simulation cylinder body, a water inlet device, a disturbance device, a data acquisition device and a constant-temperature heat-preservation cover body; one end of the goaf simulation cylinder body is connected with the water inlet device, the other end of the water inlet device is provided with the disturbance device, a constant-temperature heat-preservation cover is arranged above the goaf simulation cylinder body, and a data acquisition device is arranged on the outer side of the goaf simulation cylinder body; the coal particle sample is positioned in the goaf simulation cylinder body;

the goaf simulation cylinder body is of a cuboid structure, openings with the diameter of 35mm are reserved on the side faces of the goaf simulation cylinder body, scales from the bottom to the top are arranged in the center of the four side faces of the goaf simulation cylinder body, and the scales are from 0 to the top; a slow rebound simulation lower cushion layer is arranged at the bottom of the low rebound simulation lower cushion layer, and a waterproof adhesive tape is used for fixedly adhering a high-strength waterproof film on the slow rebound simulation lower cushion layer so as to isolate the simulation accumulated water and the residual coal in the goaf;

the water inlet device comprises a water inlet pipeline, one end of the water inlet pipeline is connected with the flow meter, the water speed regulating valve and the steel pressurizing water tank, the other end of the water inlet pipeline is stuck with an opening reserved in the closed annular simulation water adding device through 502 glue to enable the closed annular simulation water adding device and the water speed regulating valve to be connected, the simulation water adding device is an annular closed hose with the diameter of 10mm, the total length of the simulation water adding device is 1800mm, one end of the simulation water adding device is reserved with a 10mm opening and stuck to the inner wall of the upper part of the goaf simulation cylinder body, and one side of the simulation water adding;

the disturbance device is a vibrator;

the data acquisition device comprises four high-pixel cameras, and the four high-pixel cameras are opposite to the four side faces of the goaf simulation cylinder body and used for recording scale changes.

2. The device for simulating the mechanical action of the coal slime water in the old goaf on the underlying coal strata as claimed in claim 1, is characterized in that:

the size of the goaf simulation cylinder body is 400mm 500mm 800mm, a closed cuboid is spliced and fixed by a uncovered transparent organic polyester fiber material with the thickness of 10mm, and an opening with the diameter of 35mm is reserved at the center position of the side surface, which is 50mm away from the bottom.

3. The device for simulating the mechanical action of the coal slime water in the old goaf on the underlying coal strata as claimed in claim 1, is characterized in that:

the bottom of the goaf simulation cylinder body is paved with a slow-rebound simulation lower cushion layer of 400mm 500mm 200mm, the material is slow-rebound sponge, and the size of the high-strength water-proof film is 400mm 500mm 1 mm.

4. The device for simulating the mechanical action of the coal slime water in the old goaf on the underlying coal strata as claimed in claim 1, is characterized in that:

the diameter of the water inlet pipeline is 10 mm.

5. The device for simulating the mechanical action of the coal slime water in the old goaf on the underlying coal strata as claimed in claim 1, is characterized in that:

the model of vibrator is ZN35 4M type, and its vibrating head diameter is 35mm, and vibrating head length is 370mm, and the flexible axle diameter is 10mm, and the hose external diameter is 30mm, and the vibration frequency is 200Hz, and the amplitude is 0.8mm, and motor power is 1.1Kw, and the gross weight is 25 kg.

6. The device for simulating the mechanical action of the coal slime water in the old goaf on the underlying coal strata as claimed in claim 1, is characterized in that:

the constant temperature insulation cover is a transparent bottomless cubic structure with heating wires and a thickness of 1000mm 10mm, and is provided with a thermometer for controlling the internal temperature.

7. The device for simulating the mechanical action of the coal slime water in the old goaf on the underlying coal strata as claimed in claim 1, is characterized in that:

the volume of the steel pressurized water tank is 0.5m³。

8. A method for simulating mechanical action of old goaf coal slime water on an underlying coal seam is characterized in that the device for simulating the mechanical action of the old goaf coal slime water on the underlying coal seam is adopted, and the device is as claimed in any one of claims 1-7: the method comprises the following steps:

the method comprises the following steps: firstly, putting a vibrator into a goaf simulation cylinder body through a reserved hole, slowly plugging a slow-rebound simulation lower cushion layer, eliminating deformation caused by the slow-rebound simulation lower cushion layer in the plugging process after 5min, lightly placing a high-strength waterproof film on the slow-rebound simulation lower cushion layer, adhering four sides of a high-strength waterproof film to the inner wall of the goaf simulation cylinder body by using a waterproof adhesive tape, ensuring the adhesion tightness, and uniformly paving a coal particle sample on the high-strength waterproof film;

step two: checking whether the device is sealed, connecting a vibrator to a power supply, simultaneously opening a switch of a pressurized water tank, adjusting the size of water flow flowing into the goaf simulation cylinder body by using a water speed adjusting valve, preventing a paved coal particle sample from being dispersed due to overlarge water speed, simultaneously determining the primary water amount, turning off the pressurized water tank after the required water amount is reached, observing the curvature formed by the slow rebound simulation underlayer and recording;

step three: continuing to turn on a switch of the pressurized water tank, introducing water into the goaf simulation cylinder body, recording the introduced water quantity, observing the formed curvature, and repeating the process until the goaf simulation cylinder body is full of water;

step four: and reading the data recorded in the high-pixel camera, and arranging the data into an image to observe the rule of the image.

9. The method for simulating the mechanical action of the coal slime water in the old goaf on the underlying coal strata as claimed in claim 8, wherein the mechanical action is as follows: the reflectivity of the vitrinite of the coal particle sampleR _o，maxThe range is 4-5, and the particle size is 0.25-0.5mm, 0.5-1mm,1-3mm or 3-6 mm.

Technical Field

The invention relates to a device and a method for simulating mechanical action of old goaf slime water on an underlying coal rock stratum, and belongs to the technical field of mining.

Background

In coal production operation, water damage prevention and control is a great technical problem in production and scientific research, and particularly the problem of water damage caused by water accumulation in an old goaf is one of the most serious problems. The problem of serious water damage of a mine is closely related to the accumulated water in a goaf, and generally, as the goaf is old and the accumulated water amount increases year by year, a coal rock layer at the lower part of the goaf is subjected to a considerable force effect, so that the coal rock layer is damaged, and a water inrush accident occurs to cause a serious disaster. Meanwhile, in the process of accumulated water accumulation in the goaf, because residual coal beds or residual coal particles exist at the lower part of the goaf, the accumulated water and the residual coal are mixed to form a solid-liquid coexisting body or coal slime water under the condition of tunneling disturbance, and the problem of water damage caused by the accumulated water in the goaf is more complicated due to the uneven stress effect on a lower coal rock layer.

In the present stage, aiming at the problem of water accumulation in the goaf, the mechanical action or chemical erosion action of the accumulated water on the underlying coal rock stratum is remained, and the research on the mechanical action of a solid-liquid coexisting body or a colloidal substance formed by the accumulated water and the residual coal on the underlying rock stratum is very little, so that the research on the mixture of the residual coal and the water formed in the goaf is particularly important.

Disclosure of Invention

The invention aims to provide a device and a method for simulating the mechanical action of slime water in an old goaf on an underlying coal rock stratum, in particular to a device and a method for simulating the mechanical action of a coal-water mixture formed by accumulated water increased year by year in the old goaf and residual coal under the action of tunneling disturbance on the underlying rock stratum, which are used for simulating the action effect of different coal-water mixtures formed by the accumulated water increased year by year in the old goaf and the residual coal and simulating the accumulated water amount when the maximum variation is caused to reversely deduce the critical condition of water inrush in the goaf.

The invention provides a device for simulating mechanical action of old goaf slime water on a lower overlying coal rock stratum, which comprises: the goaf simulation cylinder body, the water inlet device, the disturbance device, the data acquisition device and the constant-temperature heat-preservation cover body;

one end of the goaf simulation cylinder body is connected with the water inlet device, the other end of the water inlet device is provided with the disturbance device, a constant-temperature heat-preservation cover is arranged above the goaf simulation cylinder body, and a data acquisition device is arranged on the outer side of the goaf simulation cylinder body;

the goaf simulation cylinder body is of a cuboid structure, the size of the goaf simulation cylinder body is 400mm x 500mm x 800mm, the goaf simulation cylinder body is formed by splicing and fixing a closed cuboid made of uncovered transparent organic polyester fiber material with the thickness of 10mm, an opening with the diameter of 35mm is reserved in the center position of the side surface, which is 50mm away from the bottom, and scales from the bottom to the top are arranged in the middle positions of the four side surfaces of the goaf simulation cylinder body from 0 to the topmost end; and a slow-rebound simulation lower cushion layer of 400mm x 500mm x 200mm is paved at the bottom of the goaf, the bottom layer is made of slow-rebound sponge, and a water-proof adhesive tape is used for adhering and fixing a high-strength water-proof film of 400mm x 500mm x 1mm on the slow-rebound sponge so as to isolate the simulation accumulated water and the residual coal in the goaf.

The water inlet device comprises: a water inlet pipeline with the diameter of 10mm, one end of the water inlet pipeline, a flowmeter, a water speed regulating valve and a volume of 0.5m³The water inlet pipe is connected with a steel pressurizing water tank, the other end of the water inlet pipe is stuck with an opening reserved in a closed annular water adding device through 502 glue, the water inlet pipe and the closed annular water adding device are connected, the analog water adding device is an annular closed hose with the diameter of 10mm, the total length is 1800mm, a 10mm opening is reserved at one end of the analog water adding device, the analog water adding device is stuck to the inner wall of the upper part of the goaf analog cylinder body, and circular small holes with the diameter of 1mm and the interval of 20 mm;

the disturbing device is a vibrator of model ZN35 × 4M, the diameter of a vibrating head is 35mm, the length of the vibrating head is 370mm, the diameter of a flexible shaft is 10mm, the outer diameter of a hose is 30mm, the vibration frequency is 200Hz, the amplitude is 0.8mm, the power of a motor is 1.1Kw, and the total weight is 25 kg.

The data acquisition device comprises four high-pixel cameras, and the four high-pixel cameras are opposite to the four side faces of the goaf simulation cylinder body and used for recording scale changes.

The constant temperature insulation cover is a transparent bottomless cubic structure with heating wires and a thickness of 1000mm 10mm, and is provided with a thermometer for controlling the internal temperature.

The reflectivity of the vitrinite of the coal particle sampleR _o，maxThe range is 4-5, and the particle size is 0.25-0.5mm, 0.5-1mm,1-3mm or 3-6 mm.

The invention provides a method for simulating mechanical action of old goaf slime water on an underlying coal seam, which comprises the following steps:

the method comprises the following steps: the method comprises the steps of firstly putting a vibrator into a goaf simulation cylinder body through a reserved hole, then slowly plugging a slow-resilience simulation lower cushion layer, after a period of time (about 5 min) passes, eliminating deformation caused by the plugging process of the slow-resilience simulation lower cushion layer, gently placing a high-strength waterproof film on the slow-resilience simulation lower cushion layer, adhering four sides of the high-strength waterproof film to the inner wall of the goaf simulation cylinder body by using a waterproof adhesive tape, and ensuring the adhesion tightness. And uniformly paving the coal particle sample on the high-strength water-resisting film.

Step two: whether the inspection device is sealed, even go into the power with the vibrator, open the pressurized water tank switch simultaneously, use the rivers size that water speed adjusting valve adjusted the inflow collecting space area simulation cylinder body, prevent because the too big coal granule sample of laying that breaks up of water speed, confirm the first water yield simultaneously, wait to turn off pressurized water tank after reaching required water yield, observe the camber and the record that the simulation bed course formed at a slow kick-back.

Step three: and continuously opening a switch of the pressurizing water tank, introducing water into the goaf simulation cylinder body, recording the introduced water quantity, observing the formed curvature, and repeating the process until the goaf simulation cylinder body is full of water.

Step four: and reading the data recorded in the high-pixel camera, and arranging the data into an image to observe the rule of the image.

The invention has the beneficial effects that:

compared with the prior art, the method provided by the invention has the advantages that in the process of accumulating water in the goaf year by year, the accumulated water amount is slowly increased, so that the accumulated water and the residual coal are mixed with each other, and the mechanical action is generated on the lower overburden rock layer. And the influence of the action of the coal-water mixture before the goaf water inrush is reduced by using a simulation means on the water inrush is designed, the state of the coal-water mixture after the continuously increased accumulated water and the residual coal are mixed is analyzed, and the mechanical action on the overlying strata layer under the goaf is realized under different states.

Drawings

FIG. 1 is a schematic diagram of the structure of the present invention for simulating the effect of the mixture of goaf water and residual coal on the underlying coal seam;

FIG. 2 is a top view of a gob simulation cylinder;

in the figure, 1-coal particle sample; 2-high strength water-proof film; 3-simulating a low cushion layer through slow rebound; 4-a water inlet pipeline; 5-simulating a cylinder body in the goaf; 6-pressurizing the water tank; 7-water speed regulating valve; 8-a flow meter; 9-a vibrator; 10-constant temperature insulation cover; 11-simulation of water adding device.

Detailed Description

The present invention is further illustrated by, but is not limited to, the following examples.