CN102261972A - Experimental platform for relation between mining fully-mechanized support and surrounding rocks - Google Patents
Experimental platform for relation between mining fully-mechanized support and surrounding rocks Download PDFInfo
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- CN102261972A CN102261972A CN 201110097533 CN201110097533A CN102261972A CN 102261972 A CN102261972 A CN 102261972A CN 201110097533 CN201110097533 CN 201110097533 CN 201110097533 A CN201110097533 A CN 201110097533A CN 102261972 A CN102261972 A CN 102261972A
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Abstract
The invention discloses an experimental platform for a relation between a mining fully-mechanized support and surrounding rocks. The experimental platform is used for researching an interaction relation between a hydraulic support in a mining fully-mechanized operating surface and the surrounding rocks. The platform comprises a loading experimental platform, a two-column shielding hydraulic support, a hydraulic loading system, a signal acquisition system and a data processing system, wherein the loading experimental platform comprises two experimental platform box body vertical grooves and a carrying bearing beam which is connected between the two experimental platform box body vertical grooves and used for paving an experiment material; and strain gauges are respectively embedded in different layers of the experiment material and used for monitoring the stress change of an overburden layer in a mining process. The experimental platform can load the overburden layer for complementing a ground stress. The two-column shielding hydraulic support is arranged on the operating surface and can perform real-time and on-line monitoring on loads of a top plate in the propelling process of the operating surface. The two-column shielding hydraulic support can realize high-frequency acquisition of support pressure signals and can monitor and record impact loads.
Description
Technical field
The present invention relates to a kind of coal mine fully-mechanized mining support and country rock and concern experiment porch, be used for studying the hydraulic support and the interaction with wall rocks relation of coal mine fully-mechanized mining working.
Background technology
The coal-face top board is disrumpent feelings and mobile pressing of forming is the process of a complexity, the scene is generally controlled the distortion of country rock in the stope by hydraulic support and is moved, therefore, colliery fully-mechanized mining support and country rock relation are the core contents of stope Surrounding Rock Control.Yet can only manifest rule estimation to top board load and ore deposit pressure by observation hydraulic support working resistance in the scene, be difficult to go deep into country rock inside structure and this dynamic process of structural instability that top board forms are observed.Though some scholars have carried out analog simulation experiment and numerical evaluation in the laboratory, but simulation and numerical result can only reflect the stope rock stratum and move and stress distribution, can not simulate the action effect of support, more can not determine the dynamic equilibrium relation of support and country rock country rock.
Summary of the invention
The present invention proposes a kind of coal mine fully-mechanized mining support and country rock and concern experiment porch, this platform can be simulated coal mine fully-mechanized mining support and country rock relation, the situation of change of monitoring face exploitation process medium-height trestle working resistance, rib and top board stress field can intuitively be found out structure and structural instability form that roof strata forms simultaneously in real time.
The present invention has taked following technical scheme.The present invention includes loading experiment platform, two column protected type hydraulic support, hydraulic loading system, signal acquiring system and data handling system, wherein: described loading experiment platform comprises that two experiment table casings found groove, are connected the carrying joist that is used to lay experiment material between the upright groove of two experiment table casings, different layers position in experiment material is all buried strainometer underground, in order to the STRESS VARIATION of superincumbent stratum in the monitoring seam mining process.Described two column protected type hydraulic support is arranged on the carrying joist, and exploitation is used to simulate the experiment material in coal seam.Described hydraulic loading system comprises the loading back timber, is arranged in the loading hydraulic cylinder that loads on the back timber and loads backing plate, described loading back timber is connected between the upright groove of two experiment table casings and can moves up and down along the upright groove of experiment table casing, the loading surface of loading hydraulic cylinder acts on the experiment material by loading backing plate, and described hydraulic loaded cylinder is at least two.Described signal acquiring system comprises the strainometer that is arranged in the different layers position, be arranged in loading hydraulic cylinder and load LOAD CELLS between the backing plate, be used to gather the data acquisition system (DAS) and the data handling system of above-mentioned each sensor signal, and each sensor signal that data acquisition system (DAS) will be gathered sends data handling system to and handles.
Described two column protected type hydraulic support comprises lifting jack, pressure transducer, base, back timber, four connecting rods, back tail boom and the back timber balanced structure that can stretch, wherein base, four connecting rods, back tail boom and back timber are hinged successively, fixedly connected with back timber with the back tail boom respectively in the two ends of described back timber balanced structure, described lifting jack one end is fixedlyed connected with base, and the other end and back timber are hinged.
Between the acting surface of lifting jack and back timber pressure transducer is installed, sensor base is connected with the back timber bolt, and the sensor plush copper contacts with very heavy summit.
The upright groove of described experiment table casing vertically equidistantly is distributed with horizontal through hole, and the two ends that load back timber are provided with horizontal through hole, and bolt passes horizontal through hole the two is fixed.
In terms of existing technologies, the experiment porch among the present invention can be realized superincumbent stratum is loaded, in order to replenish terrestrial stress.Arrange the two column protected type hydraulic support at workplace, can be in the advance of the face process, top board load is carried out real time on-line monitoring.Two pillar shield supports can be realized high-frequency collection poppet pressure signal, and can impact load monitor and record.
Description of drawings
Fig. 1 concerns the experiment porch schematic diagram for coal mine fully-mechanized mining support and the country rock among the present invention;
Fig. 2 (a) concerns the experiment porch front elevation for coal mine fully-mechanized mining support and the country rock among the present invention;
Fig. 2 (b) concerns the experiment porch side view for coal mine fully-mechanized mining support and the country rock among the present invention;
Fig. 3 is an experiment porch hydraulic loading device synoptic diagram;
Fig. 4 is a two column protected type hydraulic support front elevation;
Fig. 5 formally schemes for the back timber balanced structure;
Fig. 6 is a back timber balanced structure vertical view;
Fig. 7 is the formal figure of the bracket base in the two column protected type hydraulic support;
Fig. 8 is the vertical view of the bracket base in the two column protected type hydraulic support;
Fig. 9 is the formal figure of four connecting rods in the two column protected type hydraulic support;
Figure 10 is the vertical view of four connecting rods in the two column protected type hydraulic support;
Among the figure: 1, the loading experiment platform, 2, the two column protected type hydraulic support, 3, hydraulic loading system, 4, signal acquiring system, 5, data handling system, 11, the carrying joist, 12, load back timber, 13, the experiment table casing stands groove, 14, strengthen gusset, 15, the experiment table base, 16, the fixing boring of back timber, 17, the back timber set bolt, 21, load lifting jack, 22, LOAD CELLS, 23, bracket base, 24, back timber, 25, four connecting rods, 26, back tail boom, 27, the back timber balanced structure, 28, back tail boom side guard plate, 29, the back timber side guard plate, 29, four connecting rod contiguous blocks, 31, loading hydraulic cylinder, 32, the on-load pressure sensor, 33, load backing plate.
Embodiment
For above-mentioned purpose of the present invention, feature and advantage can be become apparent more, the present invention is further detailed explanation below in conjunction with the drawings and specific embodiments.
The present invention is a kind of experiment porch according to the STRESS VARIATION in test bracket working resistance, superincumbent stratum loading force, rib and the top board in stope top board and the hydraulic support mechanism, utilize on the lifting jack and experiment porch on loading hydraulic cylinder on pressure transducer, and the foil gauge in coal body and the top board carries out the data in real time monitoring, gathers and stores.
The present invention includes loading experiment platform, two column protected type hydraulic support, hydraulic loading system, signal acquiring system and data handling system, wherein: described loading experiment platform comprises that two experiment table casings found groove, are connected the carrying joist that is used to lay experiment material between the upright groove of two experiment table casings, different layers position in experiment material is all buried strainometer underground, in order to the STRESS VARIATION of superincumbent stratum in the monitoring seam mining process.Described two column protected type hydraulic support is arranged on the carrying joist, and exploitation is used to simulate the experiment material in coal seam.Described hydraulic loading system comprises the loading back timber, is arranged in the loading hydraulic cylinder that loads on the back timber and loads backing plate, described loading back timber is connected between the upright groove of two experiment table casings and can moves up and down along the upright groove of experiment table casing, the loading surface of loading hydraulic cylinder acts on the experiment material by loading backing plate, and described hydraulic loaded cylinder is at least two.Described signal acquiring system comprises the strainometer that is arranged in the different layers position, be arranged in loading hydraulic cylinder and load LOAD CELLS between the backing plate, be used to gather the data acquisition system (DAS) and the data handling system of above-mentioned each sensor signal, and each sensor signal that data acquisition system (DAS) will be gathered sends data handling system to and handles.
This platform can carry out following experiment: 1) can simulate different directly top conditions by this platform, the relation of working resistance of support and direct top rigidity; 2) the different basic tops of simulation conditions, structure and structural instability form that the disrumpent feelings back of basic rimrock piece forms, and the variation of top board load when measuring structural instability; When 3) simulating difference exploitation height, STRESS VARIATION in the rib coal body and inclined to one side group form; When 4) simulation approaches basement rock, tight roof, caving coal specific condition, the relation of top board rigidity and support load.
Experiment porch among the present invention is the variation of stress in monitoring face progradation medium-height trestle working resistance, rib and the top board in real time.The two column protected type hydraulic support that will have pressure transducer is arranged in stope, and in the analog material process of deployment foil gauge is arranged in the analog material of laying.Before the working face mining, to the coal seam, directly the mechanical property of pushing up and pushing up is substantially measured.Along with emitting, the direct top of the propelling of workplace falls the goaf, old rimrock beam is understood the disrumpent feelings of generating period, and disrumpent feelings back forms structure, and unstability takes place structure again, periodically press thereby form, in digging process, implement STRESS VARIATION in the variation of monitoring working resistance of support, rib and the top board.Experiment is handled experimental data through data handling system after finishing, and draw and adopt Stress Field Distribution rule in process medium-height trestle working resistance, coal body and the top board, and the impact of moment to support formation is pressed on old top.In conjunction with to coal body, directly top and parameters such as old top intensity, rigidity, research roof weighting mechanism is determined top board load evaluation method, instructs the hydraulic support type selecting, improves the Surrounding Rock Control level, guarantees mine safety exploitation.
Embodiment
As shown in Figure 1, the experiment porch among the present invention comprises loading experiment platform 1, two column protected type hydraulic support 2, hydraulic loading system 3, signal acquiring system 4 and data handling system 5 five parts.Two column protected type hydraulic support 2 is arranged on the loading experiment platform 1, and two column protected type hydraulic support 2 can be along with the advance of the face realizes moving horizontally on loading experiment platform 1.Hydraulic loading system 3 is arranged in the top of loading experiment platform 1.During experiment, lay coal seam and the superincumbent stratum formed according to the analog material of coal seam composite columnar section and ratio of similitude configuration on the carrying joist 11 from bottom to top successively, pressurize by 3 pairs of pavers of hydraulic loading system.In laying the model process, bury strainometer underground in the different layers position, in order to the STRESS VARIATION of superincumbent stratum in the monitoring seam mining process.
The structure of two column protected type hydraulic support 2 such as Fig. 4~shown in Figure 10, comprise lifting jack 21, pressure transducer 22, base 23, back timber 24, four connecting rods 25, back tail boom 26 and the back timber balanced structure 27 that can stretch.Wherein base 23, four connecting rods 25, back tail boom 26 and back timber 24 are hinged successively, concrete annexation such as Fig. 7~shown in Figure 10, two four connecting rod contiguous blocks 29 are arranged in parallel on bracket base 23, on the tail boom 26 of back, also be provided with two four connecting rod contiguous blocks, four connecting rods 25 are four, and its two ends are hinged with four connecting rod contiguous blocks on the tail boom of back with bracket base respectively.The two ends of back timber balanced structure 27 link by bolt with back tail boom 26 and back timber 24 respectively, lifting jack 21 1 ends are fixedlyed connected with base 23, the other end and back timber 24 are hinged, between the acting surface of lifting jack 21 and back timber 24, pressure transducer 22 is installed, the base of sensor 22 is connected with back timber 24 bolts, the sensor plush copper is directly put with lifting jack 21 and is contacted, and sensor 22 sends the pressure signal of gathering to signal acquiring system.Two column protected type hydraulic support 2 is arranged in workplace, by being built up in the high-frequency pressure signal sampler of lifting jack 21, monitors the acting force of superincumbent stratum to support in real time, and monitor signal enters data handling system by signal acquiring system.Hydraulic support is used for the acting force of test job face recovery process superincumbent stratum to hydraulic support.Two column protected type hydraulic support 2 is placed on the carrying joist 11, by moving of manual control two pillar hydraulic supports 2.Along with workplace is pushed, at first with lifting jack 21 releases, when can moving, two column protected type hydraulic support 2 just pushes ahead the two column protected type hydraulic support, assigned address to be moved to, again carry out before rising hydraulic pressure, move frame, workplace by pressure transducer 22 monitoring this moment and the working resistance of support of process such as press to change.
The signal that signal acquiring system 4 is gathered on the sensor that is arranged between two column protected type hydraulic support 2, hydraulic loading system 3 and each layer position, and send data handling system to.Wherein the signal of Cai Jiing comprises: working resistance of support signal, on-load pressure signal, coal body and top board stress signal.Signal acquiring system 4 specifically comprises: be arranged in ZF (ZAM) 1000-2GB-CL8 (* *) the N* high precision strainometer and the STSS-1 stress detection module of coal seam and superincumbent stratum, in order to the variation of coal seam and superincumbent stratum internal stress in the monitoring seam mining process; Be arranged in loading hydraulic cylinder 31 and load between the backing plate 33 and the CST-502 pressure that is arranged between two column protected type set cap 24 and the lifting jack 21 is used the radial LOAD CELLS, be used to monitor the variation of loading force and shield [support working resistance.The external CST-502 sensor of sensor amplification module imports PC through the USB-7360A data collecting card with data line, carries out data processing with 7360 series of high speed drive softwares, and each sensor signal that this equipment will be gathered sends data handling system to and handles.
When experiment porch simulation fully mechanized mining supporter among employing the present invention and country rock concern, at first need on loading experiment platform 1, lay experiment material according to calculating good ratio of similitude layering, bury strainometer simultaneously underground in the laying experiment material, with data line access signal acquiring system as shown in Figure 1, pass through hydraulic loading system simulated ground stress as shown in Figure 3 in addition on model top.After model lays, in the coal seam, excavate out open-off cut, and the two column protected type hydraulic support of inciting somebody to action as shown in Figure 4 is arranged in open-off cut, insert data collecting card with 22 data lines of the pressure transducer on the lifting jack 21 with as the data line of loading system among Fig. 3, and data collecting card is connected into as shown in Figure 5 data handling system.The normal propelling of analog operation face after all are ready, the pressure of monitoring in real time in two column protected type hydraulic support and the loading system changes, and the stress and strain signal in rib, direct top, the basic top is gathered.Workplace continues propelling, and superincumbent stratum periodically fracture occurs and also forms structure, and form when structure that observation forms and structural instability, and the displacement in the measurement superincumbent stratum moving process are advanced to model boundary until hydraulic support, finish experiment.
After the model laying is finished, to the coal seam, directly the mechanical property test is carried out in top and the sampling of basic top, the data of storing in conjunction with experimental data processing system, research support are to the adaptability of top board, and the relation of definite top board load and top plate thickness, intensity, rigidity etc.
The present invention is simple in structure, can simulate fully-mechanized mining working support and surrounding rock interaction relation effectively, and compare with other analog simulation experiment tablees, this experiment table is equipped with the two column protected type hydraulic support that high-frequency data is gathered, can be to difference exploitation height, different-thickness, simulation when strength and stiffness characteristic top board is pressed, technical characterstics such as acquisition multiparameter.
More than the experiment porch of a kind of coal mine fully-mechanized mining support provided by the present invention and country rock relation is described in detail, used specific embodiment herein principle of the present invention and embodiment are set forth, the explanation of above embodiment just is used for helping to understand method of the present invention and core concept thereof; Simultaneously, for one of ordinary skill in the art, according to thought of the present invention, part in specific embodiments and applications all can change.In sum, this description should not be construed as limitation of the present invention.
Claims (5)
1. coal mine fully-mechanized mining support and country rock concern experiment porch, it is characterized in that, comprise loading experiment platform, two column protected type hydraulic support, hydraulic loading system, signal acquiring system and data handling system, wherein: described loading experiment platform comprises that two experiment table casings found groove, are connected the carrying joist that is used to lay experiment material between the upright groove of two experiment table casings, different layers position in experiment material is all buried strainometer underground, in order to the STRESS VARIATION of superincumbent stratum in the monitoring seam mining process;
Described two column protected type hydraulic support is arranged on the carrying joist, and exploitation is used to simulate the experiment material in coal seam;
Described hydraulic loading system comprises the loading back timber, is arranged in the loading hydraulic cylinder that loads on the back timber and loads backing plate, described loading back timber is connected between the upright groove of two experiment table casings and can moves up and down along the upright groove of experiment table casing, and the loading surface of loading hydraulic cylinder acts on the experiment material by loading backing plate;
Described signal acquiring system comprises the strainometer that is arranged in the different layers position, be arranged in loading hydraulic cylinder and load LOAD CELLS between the backing plate, be used to gather the data acquisition system (DAS) and the data handling system of above-mentioned each sensor signal, and each sensor signal that data acquisition system (DAS) will be gathered sends data handling system to and handles.
2. a kind of coal mine fully-mechanized mining support according to claim 1 and country rock concern experiment porch, it is characterized in that, described two column protected type hydraulic support comprises lifting jack, pressure transducer, base, back timber, four connecting rods, back tail boom and the back timber balanced structure that can stretch, wherein base, four connecting rods, back tail boom and back timber are hinged successively, fixedly connected with back timber with the back tail boom respectively in the two ends of described back timber balanced structure, described lifting jack one end is fixedlyed connected with base, and the other end and back timber are hinged.
3. a kind of coal mine fully-mechanized mining support according to claim 2 and country rock concern experiment porch, it is characterized in that, between the acting surface of lifting jack and back timber pressure transducer is installed, sensor base is connected with the back timber bolt, and the sensor plush copper contacts with very heavy summit.
4. a kind of coal mine fully-mechanized mining support according to claim 3 and country rock concern experiment porch, it is characterized in that, the upright groove of described experiment table casing vertically equidistantly is distributed with horizontal through hole, and the two ends that load back timber are provided with horizontal through hole, and bolt passes horizontal through hole the two is fixed.
5. a kind of coal mine fully-mechanized mining support according to claim 4 and country rock concern experiment porch, it is characterized in that, described hydraulic loaded cylinder is at least two.
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