CN206114655U - A test device for simulating coal mining overlying strata grouting in separated -bed - Google Patents

Abstract

The utility model discloses a test device for simulating the grouting filling of the overlying rock separation zone in coal mine mining, which comprises a test frame, a test box, a drill and a pressure-controlled grouting device. The test box includes front and rear panels, left and right sides Plate and bottom plate, the bottom of the test box is provided with a matching base, and four rods are vertically arranged on each corner of the base, the rods are located outside the test box, and the rods are used to fix the front and rear panels and left and right side panels of the test box . The drill is a metal screw rod, the drainage metal tube is a hollow metal rod, the drainage metal tube is connected with a rubber tube, and the other end of the rubber tube is connected with the liquid outlet of the container. The utility model places similar materials in the test box, uses similar materials to simulate coal seams and rock formations, observes the movement of the rock formations after the coal seams are mined, and then drills holes at the positions designed in the experiment through the drill, and inserts the drainage metal pipe In the hole, the pressure-controlled grouting device is used to inject grout into the abscission zone, and similar simulation experiments can be used to record and observe the filling and settlement reduction effect of abscission zone filling.

Description

Experimental device for simulating the grouting filling of overlying strata separation zone in coal mine mining

technical field

The utility model belongs to the technical field of coal mines, and in particular relates to a test device for simulating coal mine mining overlying rock separation layer belt grouting filling.

Background technique

Since the Fushun Mining Bureau in my country in the late 1980s succeeded in the first test of using overlying stratum separation zone grouting to slow down surface subsidence, this technology has attracted experts and field engineers engaged in mining subsidence and "three-down" coal mining in my country. With the attention of technicians, Datun Xuzhuang Coal Mine, Xinwen Huafeng Coal Mine, Yanzhou Dongtan Coal Mine, etc. have successively carried out field tests of delamination grouting to slow down surface subsidence. Coal mine abscission zone grouting is a new way to slow down surface subsidence, but so far, it is still immature in theory and technology, and there are still many problems that need further theoretical discussion and practical verification. Therefore, abscission zone grouting The simulation of similar materials for grout filling will help to understand the phenomenon and mechanism of grouting in the abscission zone to slow down surface subsidence.

Moreover, due to the complexity of grouting problems in the abscission zone, it is difficult to monitor the development and development of the abscission zone, especially the abscission zone is dynamic, that is, its generation is conditional, and the size of the generation space changes with time and mining size And change. It is difficult to verify and analyze only relying on theoretical research and numerical simulation, and it is impossible to provide comprehensive technical support for the grouting filling process. In terms of indoor test simulation, there are few experimental studies on grouting filling in abscission zone.

The test device for simulating the grouting filling of the overlying rock separation zone in coal mine mining is to use similar materials to simulate rock formations and coal seams. The position and volume of the filling body can be analyzed in real time, so as to realize the simulation of the surface subsidence slowed down by the filling of the separation layer and the monitoring of the movement of the separation layer.

Utility model content

The utility model provides a test device for simulating the grouting filling of the overlying stratum separation zone in coal mining to solve the above-mentioned defects in the prior art. Boreholes inject grout into the abscission zone, and through the records and observations of the surface subsidence, as well as the position and volume analysis of the filling body during excavation after the experiment, the monitoring of the abscission layer movement and the simulation of the abscission zone filling to slow down the surface subsidence are realized .

Its technical solutions are:

A test device for simulating the grouting filling of overlying rock separation zone in coal mine mining, which includes a test frame, a test box, a drill and a pressure-controlled grouting device. The test frame consists of a base and four rods extending upward Composition, the test box is located on the base, the test box includes front and rear panels, left and right side panels and a bottom plate, the front and rear panels, left and right side panels and the bottom plate form an accommodating space for placing samples, the front and rear panels, The left and right side plates are respectively fixed on the rod body. The grouting device is composed of a cylindrical container, a built-in piston, a weight, a rubber tube, and a drainage metal tube. The drainage metal tube is connected to the container through a rubber tube. The built-in The piston is composed of a metal sheet and a metal handle. The edge of the sheet metal is wrapped with rubber to prevent leakage. The diameter of the drill is the same as that of the drainage metal pipe. The grouting pressure is adjusted by placing lead blocks of different masses above the built-in piston.

Beneficial technical effects brought by the utility model:

The utility model proposes a test device for simulating the grouting filling of the overlying rock separation layer in coal mine mining. It places solid-liquid coupling similar materials in the test box and uses solid-liquid coupling similar materials to simulate rock formations and coal seams. After simulating mining, drill holes to the rock layer separation area, and inject grout into the separation layer zone through the drainage metal pipe to simulate the effect of slowing down the ground subsidence after grouting, and then pass the test to solidify the position and location of the grouting body The movement of the abscission zone was reversed by using the volume, which avoided the undetectability of the abscission zone movement in previous experiments, and realized the indoor simulation of slowing down the surface subsidence after the abscission layer grouting.

There is a pressure gauge at the liquid outlet of the container, which can reduce the test error. In addition, the grouting amount can be adjusted by adjusting the pressure to achieve different surface subsidence effects. There is a scale inside the container to facilitate the calculation of the volume of the filling material used.

Description of drawings

Below in conjunction with accompanying drawing, the utility model is further clearly and completely explained:

Fig. 1 is the structural representation of the utility model test device;

Fig. 2 is the partial structure schematic diagram of the utility model test device, shows the piston part in the figure;

In the figure, 1. Test rack, 2. Test box, 3. Rod body, 4. Screws and nuts, 5. Container, 6. Drill, 7. Rubber tube, 8. Drainage metal tube, 9. Rubber ring, 10 , valve, 11, pressure gauge, 12, built-in piston, 13, lead block, 14, handle, 15, rubber ring, 16, can close the air hole.

detailed description

The utility model discloses a test device for simulating the grouting filling of the overlying rock separation zone in coal mine mining. In order to make the advantages and technical solutions of the utility model clearer and clearer, the utility model will be further clarified in combination with specific examples below. , a complete description.

As shown in Fig. 1 and Fig. 2, the utility model is a test device for simulating the grouting filling of overlying strata separation zone in coal mining, including a test frame 1, a test box 2 and a pressure-controlled grouting device, and a test box 2 Located on the test frame 1, the test box 2 is a cuboid structure with a length of 1 meter, a width of 0.5 meters, and a height of 0.6 meters. It is used to place similar materials in the test box 2. The test box 2 is divided into front and rear panels, left and right side panels And base plate, the bottom of test box 2 is provided with the test frame 1 that matches it, and each angle of test frame 1 is vertically provided with four rod bodies 3, and the length of each rod body is 0.6 meter, and each rod body 3 are provided with through holes, which are fixedly connected to the corresponding front and rear panels or left and right side panels through screw connection. The test frame 1 and the rod body 3 are made of hollow steel; the drainage metal tube 8 passes through the rubber tube 7 and the container 5 Connection, the outside of the drainage metal tube 8 is provided with a rubber ring 9 to prevent leakage, the filling material is placed in the space formed by the container 5 and the built-in piston 12, and the filling material is pressurized through the built-in piston 12 and the lead block 13 placed on it , The outer side of the built-in piston 12 is provided with a rubber ring 15 to prevent leakage.

The usage method of the utility model device:

Step 1. First make a similar material model and mine it

According to the actual situation of the mine, design the required solid-liquid coupling similar materials with the ratio of each component, place the similar materials that have been mixed evenly and reconciled in the forming mold device for laying and compaction, the thickness of the model is determined by the similar ratio of the test design, and the model laying is completed Finally, the coal seam was mined on the model according to the test design plan. After mining for a certain period of time, when the rock layer above the coal seam had obvious separation phenomenon, the test was prepared and the evolution characteristics of the separation zone were observed and recorded.

Step 2. Prepare for grouting filling

Place the grouting filling device at the same height as the upper surface of the model, configure the filling material according to the test design plan, put the filling material into the container 5, open the vent hole 16, and put the built-in piston 12 into the container 5 until the piston naturally drops to the bottom. Close the vent hole 16 when the plane touches the filling material, and place lead blocks 13 of different masses on the built-in piston 12 until the reading of the pressure gauge 11 reaches the design pressure.

Step 3. The grouting filling process of the abscission zone

Use the drill 6 to drill a hole to a certain depth at the test design position, open the valve 10 until the drainage metal tube 8 is filled with the filling material, close the valve, record the position of the built-in piston on the scale line inside the container, and put the drainage metal tube 8 into place. Enter the drill hole, press the rubber ring 9, open the valve 10 for grouting filling, and record the position of the built-in piston on the scale line when the built-in piston 12 no longer slides down within the specified time.

Step 4. Experimental observation process

After the above step 3 is completed, observe the ground subsidence simulated by similar materials and record it. After the recording is completed, excavate the filling body after the filling material has solidified, and record the position and volume shape of the filling body.

The specific embodiments described herein are only examples to illustrate the spirit of the present invention. Those skilled in the technical field to which the utility model belongs can make various modifications or supplements to the described specific embodiments or adopt similar methods to replace them, but they will not deviate from the spirit of the utility model or go beyond the appended claims defined range.

Although this article uses a lot of test racks, test boxes, rods, screws and nuts, containers, drills, rubber tubes, drainage metal tubes, rubber rings, valves, pressure gauges, built-in pistons, lead weights, handles, rubber rings , can close the ventilation holes and other terms, but does not exclude the possibility of using other terms. These terms are only used to describe and explain the essence of the utility model more conveniently; interpreting them as any kind of additional limitation is against the spirit of the utility model.

Claims (4)

1. A test device for simulating coal mine mining overlying rock separation zone grouting filling, it comprises test frame, test box, drill and pressure-controlled grouting device, and described test box is positioned on described test frame, The test box includes front and rear panels, left and right side panels and a bottom plate, and the front and rear panels, left and right side panels and the bottom plate form an accommodating space for placing samples, and it is characterized in that: the bottom of the test box is provided with a matching Base, the base is provided with four vertical rods upwards, and the front and rear panels and the left and right panels are fixed by the rods, the base and the rods are made of hollow square stainless steel; the pressure-controlled grouting device includes a cylindrical container , built-in piston, weight, rubber tube, drainage metal tube, the drainage metal tube is connected to the container through the rubber tube, the built-in piston is composed of a metal sheet and a metal handle, and the edge of the metal sheet is wrapped with rubber to prevent leakage, The drill has the same diameter as the drainage metal pipe. 2. The test device for simulating the grouting filling of overlying stratum separation zone in coal mine mining according to claim 1, characterized in that: the test box is a cuboid structure with a width of 0.5 meters, a length of 1 meter, and a height of 0.6 meters. 3. The test device for simulating the grouting filling of overlying strata separation zone in coal mine mining according to claim 2, characterized in that: the front and rear panels and the left and right side panels are fixed by four rods, and each panel is fixed by two The rod body is fixed. 4. The test device for simulating the grouting filling of overlying strata separation zone in coal mine mining according to claim 3, characterized in that: the pressure-controlled grouting device controls the grouting pressure by placing heavy objects on the piston .