Testing device for testing fracturing and compaction characteristics of overlying strata separation layer grouting slurry

Abstract

The utility model relates to a testing device for testing the precipitation compaction characteristic of overlying strata separation grouting slurry, which comprises a slurry precipitation compaction characteristic testing assembly, a testing machine and a control system, and is characterized in that the testing machine comprises a compaction assembly and a base; the slurry drainage compaction characteristic test assembly comprises a sample barrel, the sample barrel is placed on the base and used for storing slurry, a drainage base is arranged at the bottom of the sample barrel, and a drainage channel is arranged in the drainage base; the water guide pipe is communicated with the drainage channel; the flow meter is connected to the water guide pipe, and a digital display water meter is arranged on the flow meter and used for monitoring water flow changes and providing real-time flow data; the control system is electrically connected with the testing machine and used for controlling the compaction assembly of the testing machine to pressurize the slurry. The test device can be used for carrying out compaction characteristic test research on overlying strata separation layer grouting slurry under different pressures, and the bearing capacity of a slurry consolidation body is evaluated based on test results, so that a reasonable basis is provided for grouting filling design.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of slurry water separation compaction characteristic research, specifically relates to a test device for testing the slurry water separation compaction characteristic of overburden separation grouting. BACKGROUND

[0002] Coal is the main energy source of China, and is the strategic guarantee of China's energy security. In the future for a long period of time, China's energy structure dominated by coal will not change. However, while promoting economic growth, coal also causes serious geological environmental problems due to its high-intensity and large-area mining. The problem of surface subsidence is particularly obvious, not only causing damage to farmland, cultivated land and buildings, but also causing environmental problems such as soil erosion and land desertification. For the problem of surface subsidence, separation grouting technology has become the current technology that is widely concerned because it does not affect normal mining underground.

[0003] In the process of mining overburden grouting and filling, a small part of water in the filling slurry is bound by fly ash particles to become bound water, and the other part is free water that can carry fly ash particles while flowing. Under the extrusion of the weight of the overlying rock, the slurry is compacted, and the free water is continuously separated out during the compaction process. Too much free water separation not only leads to low filling efficiency, but also may overflow along the structure surface such as fault, which has adverse effects on coal mine safety production. Therefore, mastering the water separation and compaction characteristics of slurry, such as fly ash slurry, can provide theoretical support for slurry proportioning and grouting engineering design.

[0004] Fly ash slurry is a kind of slurry and a new type of grouting material. At present, there is less research on the water separation and compaction characteristics of slurry. A large number of scholars have studied the compaction characteristics of dry fly ash and gangue powder and the water separation characteristics of concrete and designed related test equipment. Only a small number of scholars have designed related simple test equipment for the water separation and compaction characteristics of overburden separation grouting slurry.

[0005] Problems or deficiencies of existing means:

[0006] (1) The compaction characteristics of slurry are crucial to the determination of overburden separation grouting amount and engineering design. At present, there are few test equipment for testing the compaction characteristics of slurry, so it is urgent to design a test device for testing the water separation and compaction characteristics of slurry to provide technical support for separation grouting design.

[0007] (2) The existing small amount of test equipment for slurry compaction can only obtain the final water separation amount, lacks monitoring of water separation amount during water separation and compaction process, and cannot comprehensively study the water separation and compaction characteristics of slurry by using existing equipment. However, the change of water separation speed during the water separation and compaction process of slurry is of great significance to the selection of grouting parameters such as grouting speed and grouting pressure. SUMMARY

[0008] In view of the deficiencies of the prior art, the utility model provides a kind of for testing the test device of overburden strata separation grouting slurry water separation compaction characteristics, and the test device is a kind of simple structure, easy to operate, high accuracy test system.The test system provided by the utility model can realize the research on the bearing capacity of slurry solidification and water separation amount, and provides new test equipment and new method for the research on the water separation compaction characteristics of overburden strata separation grouting slurry.

[0009] To achieve the above object, the utility model is realized by the following technical schemes:

[0010] A kind of for testing the test device of overburden strata separation grouting slurry water separation compaction characteristics, including slurry water separation compaction characteristics test component, testing machine and control system, wherein:

[0011] The testing machine includes compaction component and base;

[0012] The slurry water separation compaction characteristics test component includes:

[0013] Sample barrel, the sample barrel is placed on the base, for storing slurry, the bottom of the sample barrel is provided with water separation base, and the water separation base is provided with water separation channel;

[0014] Water pipe, the water pipe is communicated with the water separation channel;

[0015] Flowmeter, the flowmeter is connected on the water pipe, and digital water gauge is provided on the flowmeter, for monitoring water flow change and providing real-time flow data;

[0016] The control system is electrically connected with the testing machine, for controlling the compaction component of the testing machine to pressurize slurry.

[0017] In some feasible embodiments, the compaction component includes:

[0018] Connecting rod, one end of the connecting rod is provided on the testing machine, and the connecting rod is driven up and down by the control system;

[0019] Piston, the piston is provided on the other end of the connecting rod, and the connecting rod pushes the piston to pressurize test.

[0020] In some feasible embodiments, the base is provided with limiting recess, and the inner diameter of the limiting recess matches the outer diameter of the sample barrel, for placing sample barrel.

[0021] In some feasible embodiments, the bottom of the sample barrel is paved with filter screen, for filtering slurry particles.

[0022] In some possible embodiments, one end of the water separation channel is a wide-mouth structure connected with the bottom of the filter screen for collecting all water flow; the other end of the water separation channel is connected with one end of the water guide pipe.

[0023] In some possible embodiments, the water separation channel is arranged obliquely, and the end connected with the filter screen is higher than the end connected with the water guide pipe.

[0024] In some possible embodiments, a through hole is arranged on the sidewall of the water separation base, and a water release valve is connected with the outer end of the through hole; the water separation channel is connected with the water guide pipe through the water release valve, and the water release valve is used for controlling water flow.

[0025] In some possible embodiments, the slurry water separation compaction characteristic test assembly further comprises a measuring cylinder, and the measuring cylinder is used for collecting and measuring the water amount separated from the water guide pipe.

[0026] In some possible embodiments, the water guide pipe is arranged obliquely, and the end connected with the water separation channel is higher than the end close to the measuring cylinder.

[0027] In some possible embodiments, the test sample barrel is movably connected with the base through a fixing nut.

[0028] The utility model provides a kind of test device for testing overburden separation grouting slurry water separation compaction characteristic, overcome the deficiency of prior art, can carry out the compaction characteristic test research of slurry under different pressure, based on test result, the bearing capacity of slurry solidification body is evaluated, to provide reasonable basis for grouting filling design.The utility model has the beneficial effect that:

[0029] (1) the test device provided by the utility model can accurately evaluate the compaction characteristic and water separation characteristic of slurry, so as to provide a solution for exploring the water separation amount, filling efficiency and other problems of filling slurry in actual mining overburden separation grouting engineering.

[0030] (2) the test device provided by the utility model is connected with digital water gauge on flowmeter, and the water separation amount within a specified time can be accurately measured and read by setting flowmeter, so as to correct the observation error caused by naked eye reading water separation in measuring cylinder.

[0031] (3) the test device provided by the utility model can read water separation amount in real time, so as to obtain the relationship curve between water separation amount and time, solve the defect that existing equipment can only obtain final water separation amount, and accurately reflect the change in water separation process.

[0032] (4) the test device provided by the utility model lays filter screen on the bottom of test sample barrel, effectively filters out particles in slurry, ensures the purity of water flow, avoids that particles block water guide channel, and ensures the accuracy of test result.

[0033] (5) The test device provided by the utility model, through the inclined design of the water separation channel and the water guide pipe, water is smoothly caused to flow out by gravity, water flow stagnation or accumulation is effectively avoided, and the accuracy of test results is ensured.

[0034] (6) The test device provided by the utility model can provide important technical support for the progress of test technology in other related fields.

[0035] It should be understood that the implementation of any embodiment of the present application does not mean that all or multiple of the above beneficial effects are simultaneously possessed or achieved. BRIEF DESCRIPTION OF DRAWINGS

[0036] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the embodiment or prior art description will be briefly introduced below. Obviously, the drawings in the following description are only exemplary, and for those skilled in the art, other implementation drawings can be derived from the provided drawings without creative labor.

[0037] The structures, proportions, sizes, etc. shown in the specification are only used to cooperate with the content disclosed in the specification, to be understood and read by those skilled in the art, and do not define the limiting conditions for the implementation of the present application, so they do not have technical substantive significance. Any modification of structure, change of proportion relationship or adjustment of size, without affecting the effects and purposes that the present application can produce, should still fall within the scope of the technical content disclosed by the present application.

[0038] Figure 1 is a schematic view of the overall structure of an embodiment of the utility model;

[0039] Figure 2 is a schematic view of the structure of the testing machine and control system of an embodiment of the utility model;

[0040] Figure 3 is a schematic view of the structure of the slurry water separation and compaction characteristic test assembly of an embodiment of the utility model.

[0041] In the drawings:

[0042] 100, testing machine; 110, compaction assembly; 111, connecting rod; 112, piston; 120, base; 121, limiting groove;

[0043] 200, control system;

[0044] 300, slurry dewatering compaction characteristic test assembly; 310, sample barrel; 311, dewatering base; 312, dewatering channel; 313, filter screen; 320, water guide pipe; 321, water release valve; 322, flow meter; 323, digital display water meter; 330, measuring cylinder;

[0045] 400, slurry.

[0046] In the various drawings, identical or corresponding reference numbers represent identical or corresponding parts. DETAILED DESCRIPTION

[0047] To make the objectives, technical solutions and advantages of the embodiments of the present application clearer, the embodiments of the present application are further described in detail below with reference to the embodiments and drawings. Herein, the illustrative embodiments of the present application and their descriptions are used to explain the present application, but are not used as limitations to the present application.

[0048] In the present application, unless otherwise explicitly specified and limited, the terms “mounting”, “connection”, “connecting”, “fixing” and other terms should be understood in a broad sense, for example, can be fixed connection, or detachable connection, or integral; can be mechanical connection, or electrical connection; can be direct connection, or indirect connection through an intermediate medium; can be internal connection of two elements or interaction relationship between two elements. For those skilled in the art, the specific meanings of the above terms in the present application can be understood according to the specific circumstances.

[0049] It should be understood that the terms “including / containing”, “consisting of” or any other variants are intended to cover non-exclusive inclusion, so that the product, device, process or method including a series of elements not only includes those elements, but also includes other elements not explicitly listed, or further includes the elements inherent to such product, device, process or method. Without more limitations, the elements defined by the statement “including / containing”, “consisting of” do not exclude the existence of other same elements in the product, device, process or method including the elements.

[0050] It should also be understood that the terms “up”, “down”, “front”, “back”, “left”, “right”, “top”, “bottom”, “inner”, “outer” and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only used to facilitate the description of the present application and simplify the description, and do not indicate or imply that the devices, components or structures referred to must have a particular orientation, be constructed or operated in a particular orientation, and cannot be understood as a limitation to the present application.

[0051] In addition, the terms "first", "second", "third", etc. are used only for descriptive purposes and do not connote or imply relative importance or a quantity of the indicated technical features. Thus, features with "first", "second", "third" designations can include one or more of the features explicitly or implicitly. In the description of the present application, the meaning of "a plurality" is two or more, unless otherwise expressly and specifically limited.

[0052] In order to better understand the above technical solutions, the above technical solutions will be described in detail below in combination with the drawings and specific embodiments.

[0053] As shown in Figure 1 , the utility model provides a kind of for testing overburden separation layer grouting slurry water separation compaction characteristics test device, mainly include: testing machine 100, control system 200 and slurry water separation compaction characteristics test assembly 300.

[0054] The following is described with one of the slurry, fly ash slurry as an example.

[0055] Referring to Figure 2 , Figure 3 , testing machine 100 is electro-hydraulic servo universal testing machine, as the main structure of the whole test device, with control system 200 electrically connected, the work of testing machine 100 is controlled by control system 200.

[0056] Compaction assembly 110 and base 120 are provided on testing machine 100, and the fly ash slurry is placed on the base. Compaction assembly 110 pressurizes the slurry 400 in sample barrel 310, and base 120 is used to place sample barrel 310. The bottom of sample barrel 310 is provided with water separation base 311, water separation channel 312 is provided in water separation base 311, water guide pipe 320 is communicated with water separation channel 312, flowmeter 322 is connected on water guide pipe 320, and digital water gauge 323 is provided on flowmeter, for monitoring water flow change and providing real-time flow data. The test device provided in the embodiment can carry out compaction characteristic test research of fly ash slurry under different pressures, accurately evaluate the compaction characteristics and water separation characteristics of fly ash slurry, evaluate the bearing capacity of slurry solid based on test results, so as to provide reasonable basis for grouting filling design.

[0057] Referring to Figure 2The testing machine 100 has a vertical structure and is placed on a horizontal surface during operation. The testing machine 100 has a hydraulic structure, which, under the control of the control system 200, drives the compaction component 110 to move up and down to compact the grout 400. The compaction component 110 includes a connecting rod 111 and a piston 112. One end of the connecting rod 111 is mounted on the testing machine 100, and the hydraulic structure of the testing machine 100, controlled by the control system 200, drives the connecting rod 111 to move up and down. The piston 112 is located at the other end of the connecting rod 111, and the connecting rod 111 pushes the piston 112 to pressurize the grout 400, thereby simulating the force exerted by the actual grouting filling layer in the formation.

[0058] See also Figure 2 , Figure 3 The testing machine 100 includes a base 120, on which a limiting groove 121 is provided. The inner diameter of the limiting groove 121 matches the outer diameter of the sample bucket 310. During the test, the sample bucket 310 is placed in the limiting groove 121 to limit and fix the sample bucket 310, ensuring the stability of the slurry 400 throughout the test.

[0059] A filter screen 313 is laid at the bottom of the sample container 310. When the piston 112 continuously pressurizes the slurry 400, the filter screen 313 can filter fly ash particles, and only free water continuously precipitates out during the compaction process and flows into the water drainage channel 312. The filter screen 313 can ensure the purity of the water flow and prevent particles from clogging the subsequent water guiding channel.

[0060] See also Figure 3 The water separation channel 312 penetrates the inner cavity of the water separation base 311. One end of the channel has a wide opening and connects to the bottom of the filter screen 313, covering the entire bottom of the filter screen 313 to collect all the separated water. The other end of the water separation channel 312 connects to one end of the water guide pipe 320. The water separation channel 312 is inclined, with the end connected to the filter screen 313 higher than the end connected to the water guide pipe 320. Gravity is used to promote the smooth flow of water into the water guide pipe 320, effectively preventing water stagnation or accumulation and ensuring the accuracy of the test results.

[0061] A through hole is provided on the side wall of the water separation base 311. A drain valve 321 is connected to the outer end of the through hole. The water separation channel 312 passes through the through hole and is connected to the water guide pipe 320 through the drain valve 321. The tail end of the water separation channel 312 is connected to the inlet of the drain valve 321, and the head end of the water guide pipe 320 is connected to the outlet of the drain valve. The drain valve 321 is used to control the water flow from the water separation channel 312 into the water guide pipe 320.

[0062] The flow meter 322 is connected to the water guide pipe 320, and a digital water meter 323 is arranged on the flow meter 322, and the digital water meter 323 is internally provided with an automatic timing device. The flow meter 322 can accurately monitor the change of water flow, the digital water meter 323 can provide real-time and accurate flow data, display water flow, facilitate recording, and avoid the eye error caused by the reading of a traditional measuring cylinder.

[0063] Continuing to refer to Figure 3 The slurry water separation and compaction characteristic test assembly 300 further comprises a measuring cylinder 330 for collecting the water flow separated in the water guide pipe 320 and measuring the water separation amount.

[0064] The water guide pipe 320 is slightly inclined, and one end connected with the water separation channel 312 is higher than the end close to the measuring cylinder 330, so that the gravity is utilized to promote the water flow to flow into the measuring cylinder 330, and the accuracy of test data is ensured. Meanwhile, the end of the water guide pipe 320 close to the measuring cylinder 330 is designed to be bent downward, so that the water flow is conveniently collected into the measuring cylinder 330, and thus the accurate measurement and recording of the water separation amount are completed. The water flow recorded in the measuring cylinder 330 can be used as the data supplement and re-verification of the test.

[0065] Finally, in order to ensure the stability of the sample barrel 310 in the whole pressurization process and prevent the occurrence of phenomena such as slipping and overturning, the sample barrel 310 is fixed by a fixing nut and the base 120 during the test, the fixing nut is loosened after the water separation test is completed, the sample barrel 310 is taken out, the compacted body is taken out and prepared for subsequent analysis.

[0066] The specific test process of the test device for testing the slurry water separation and compaction characteristics of overburden separation layer grouting is introduced below.

[0067] Step one: inspection of element and structure connection before test.

[0068] Before starting the operation, firstly, it is ensured that each element and structure part of the test machine is connected completely and stably. Firstly, all the oil pipe joints are checked to ensure that there is no loosening phenomenon. If the loosening place is found, the tool is used to tighten it in time to avoid leakage during the test. Then, it is checked whether the mechanical structure part of the test machine is intact to ensure the stability of the equipment so as to avoid affecting the test result. Finally, it is confirmed that the power line connection is normal, and there is no short circuit or loosening phenomenon.

[0069] Step two: waterway inspection before test.

[0070] Before pressurization, it is ensured that the water pipe connected with the test machine has no cracks, wear or other damage.

[0071] The water release valve 321 is opened to ensure that the water flow is unobstructed, and the liquidity of water will not be hindered in the test. If the water release valve has a problem, it is repaired in time.

[0072] Step 3: Place the sample container.

[0073] After preparing the slurry 400, place it into the sample bucket 310, and then place the sample bucket 310 containing the slurry 400 into the limiting groove 121 of the base 120 of the testing machine, and fix it with the fixing nut to ensure accurate positioning and avoid displacement.

[0074] Step 4: Pressure test.

[0075] Turn on the power to the universal testing machine and operate it to gradually apply pressure to the slurry 400. During this process, continuously monitor the pressurization process of the testing machine to ensure that the pressure changes meet the test requirements.

[0076] Step 5: Observe and record the amount of water separated.

[0077] When the slurry sample 400 begins to separate water, water flows into the flow meter 322 and triggers the built-in automatic timing device of the digital water meter 323. Continue to observe and record the amount of water separation until the slurry 400 stops separating water. At this point, stop the pressurization operation and close the drain valve 321.

[0078] Step 6: Remove the pressed body.

[0079] After the water separation process is complete, loosen the fixing nut and remove the sample container 310. Remove the compacted body and prepare for subsequent analysis.

[0080] Step 7: Experimental Analysis.

[0081] Based on the volume of the extracted sample and the water separation data read from the digital water meter 323, data calculations were performed. A time-water separation curve was plotted, and the water separation of slurry 400 at different time points was analyzed using the curve.

[0082] Step 8: Repeat the experiment to draw a conclusion.

[0083] Repeat the above steps, gradually adjusting the pressure applied by the testing machine 100 according to the experimental requirements. Conduct multiple tests under different pressure loads, analyzing the compaction and water separation characteristics of the slurry 400. Summarize all experimental data, compare the results under different loads, and draw a comprehensive conclusion.

[0084] The experimental device proposed in this invention can be used to study the bearing capacity and water exudation of grouting solids in overburden delamination, providing new experimental equipment and new research methods for studying the water exudation and compaction characteristics of grouting solids in overburden delamination.

[0085] While several specific implementation details are included in the foregoing discussion, these should not be construed as limiting the scope of the invention. Certain features described in the context of individual embodiments may also be implemented in combination in a single implementation. Conversely, various features described in the context of a single implementation may also be implemented individually or in any suitable sub-combination in multiple implementations.

[0086] The various embodiments of the present invention have been described above. These descriptions are exemplary and not exhaustive, nor are they limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is chosen to best explain the principles, practical application, or technical improvements to the embodiments in the market, or to enable others skilled in the art to understand the embodiments disclosed herein.

Claims

1. A test device for testing the water separation compaction characteristics of an overburden separation grouting paste, characterized in that, The slurry water separation compaction characteristic test assembly comprises a test machine and a control system. The test machine comprises a compaction assembly and a base. The slurry water separation compaction characteristic test assembly comprises: a sample barrel placed on the base for storing slurry, wherein a water separation base is arranged at the bottom of the sample barrel, and a water separation channel is arranged in the water separation base; a water guide pipe in communication with the water separation channel; a flow meter connected to the water guide pipe, wherein a digital water meter is arranged on the flow meter for monitoring water flow change and providing real-time flow data; The control system is electrically connected with the test machine for controlling the compaction assembly of the test machine to pressurize the slurry.

2. The test device of claim 1, wherein The compaction assembly comprises: a connecting rod, one end of which is arranged on the test machine, and the connecting rod is driven to move up and down by the test machine controlled by the control system; a piston arranged at the other end of the connecting rod, wherein the connecting rod pushes the piston to pressurize the slurry.

3. The test device of claim 1, wherein A limiting groove is arranged on the base, and the inner diameter of the limiting groove matches the outer diameter of the sample barrel for placing the sample barrel.

4. The test device of claim 1, wherein A filter screen is arranged at the bottom of the sample barrel for filtering slurry particles.

5. The test device of claim 4, wherein, One end of the water separation channel is a wide-mouth structure connected with the bottom of the filter screen for collecting all water flow, and the other end of the water separation channel is connected with one end of the water guide pipe.

6. The test device of claim 5, wherein The water separation channel is arranged obliquely, and the end connected with the filter screen is higher than the end connected with the water guide pipe.

7. The test device of claim 1, wherein A through hole is arranged on the sidewall of the water separation base, and a water release valve is connected with the outer end of the through hole, wherein the water separation channel and the water guide pipe are connected through the water release valve, and the water release valve is used for controlling water flow.

8. The test device of claim 1, wherein, The slurry water separation compaction characteristic test assembly further comprises a measuring cylinder for collecting and measuring the water separated from the water guide pipe.

9. The test device of claim 8, wherein, The water guide pipe is arranged obliquely, and the end connected with the water separation channel is higher than the end close to the measuring cylinder.

10. The test device of claim 1, wherein, The sample barrel is movably connected with the base through a fixing nut.

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