CN114924055B - Two-way angle adjustable three-dimensional physical similarity simulation experiment platform and experiment method thereof - Google Patents

Abstract

A two-way angle-adjustable three-dimensional physical analog simulation experiment platform and an experiment method thereof comprise a base, a supporting frame, a vertical bracket and an experiment frame, wherein a rotary driving mechanism drives the experiment frame to rotate on the supporting frame, so that the rotation angle of the experiment frame on the supporting frame is changed to simulate the pseudo-inclined angle of a coal face; the base is provided with a horizontal sliding guide device, the vertical support is provided with a vertical sliding guide device, and the lifting driving mechanism is in transmission connection with the supporting frame to drive the supporting frame to move under the guidance of the horizontal sliding guide device and the vertical sliding guide device, so that the inclination angle of the experimental frame on the base is changed to simulate the true inclination angle of the coal face; a plurality of stress sensor mechanisms are arranged in the direction frame body, and the simulation of the coal seam is realized by adjusting the heights of the stress sensor mechanisms. The invention can simulate an inclination angle of 0-60 degrees, can simulate a pseudo-dip working surface, and solves the problem of establishing the pseudo-dip working surface on a common experimental platform.

Description

Two-way Angle Adjustable Three-Dimensional Physical Similarity Simulation Experiment Platform and Its Experimental Method

technical field

The invention relates to the field of experimental testing of mining engineering and geotechnical engineering technology, in particular to a two-way angle-adjustable three-dimensional physical similarity simulation experiment platform and an experiment method thereof.

Background technique

In the underground construction site of mining engineering and geotechnical engineering, due to the complex site environment and many uncertain factors, it is difficult to conduct technical analysis on the construction site as a whole to achieve the purpose of safe and efficient production. The physical similarity simulation experiment can effectively simulate the overall situation of the site, and draw conclusions through the method of factor evolution. However, most of the physical similarity simulation experimental platforms in the prior art can only simulate horizontal or near-horizontal coal seams (rock formations). Due to the limitations of simulation materials and monitoring methods, the research on internal deformation of materials, stress parameters, and surrounding rock structure in stope space is difficult. There is a problem.

In particular, when the coal seam has a certain inclination angle and pseudo-inclined mining, the simulation of surrounding rock deformation and failure laws is mostly simulated by simplified models: or simplified to near-horizontal coal seam mining, or pseudo-inclined mining into real inclination, etc. The above methods cannot be realistic. Restore the actual production conditions, which has a certain impact on the pertinence and accuracy of the research conclusions on the migration laws of surrounding rocks.

Contents of the invention

Based on this, the present invention provides a two-way angle-adjustable three-dimensional physical similarity simulation experiment platform and its experimental method to solve the problem that the physical similarity simulation experiment platform in the prior art cannot truly restore the actual production conditions, thereby affecting the migration laws of surrounding rocks. The pertinence and accuracy of the research conclusions have a certain impact on technical issues.

In order to achieve the above object, the present invention provides a two-way angle-adjustable three-dimensional physical similar simulation experiment platform, which includes a base, a support frame, a vertical support and an experiment frame, wherein:

The experimental frame includes a chassis and a direction frame fixedly arranged on the chassis, the chassis is arranged on the support frame and is in transmission connection with the rotary drive mechanism provided on the support frame, and the rotary drive mechanism is used for Driving the test frame to rotate on the support frame, thereby changing the rotation angle of the test frame on the support frame to simulate the pseudo-inclination angle of the coal mining face;

The vertical support is erected on one side of the base, the base is provided with a horizontal slide guide, the vertical support is provided with a vertical slide guide, the front side of the support frame is in contact with the horizontal The sliding guide device is slidably matched, and the rear side of the support frame is slidably matched with the vertical sliding guide device. The vertical support is provided with a lifting drive mechanism, and the lifting drive mechanism is connected to the support frame for transmission. To drive the supporting frame to move under the guidance of the horizontal sliding guide and the vertical sliding guide, so as to change the inclination of the experimental frame on the base to simulate the true inclination of the coal mining face;

The direction frame of the experimental frame is provided with a number of stress sensor mechanisms densely distributed on the chassis, and the height of the top surface of each stress sensor mechanism can be adjusted, and the simulated coal seam can be realized by adjusting the height of the stress sensor mechanism. , the bottom of the stress sensor mechanism is provided with an upward observation hole, and the observation hole is used to observe the state of the simulated coal seam in the experiment.

As a further preferred technical solution of the present invention, the vertical support is a gantry structure, the vertical support is erected on one side of the base through two columns, and the tops of the two columns are connected with cross beams; The vertical sliding guiding device includes two parallel cylindrical guide rods, each of which is vertically arranged close to one of the upright posts, the flat sliding guiding device includes two parallel sliding rails, and the supporting frame The front side of the support frame slides with the slide rails through rollers, the rear side of the support frame slides with the cylindrical guide rods through pulleys, and the two cylindrical guide rods and the two slide rails are located on the Support the left and right sides of the frame.

As a further preferred technical solution of the present invention, the lifting drive mechanism includes a motor and two lead screws connected with the motor transmission, the two lead screws are vertically arranged on the vertical support, and the lead screws The nut is connected with the support frame, and when the motor drives the lead screw of the lead screw to rotate, it drives the support frame to move under the guidance of the horizontal slide guide device and the vertical slide guide device.

As a further preferred technical solution of the present invention, the chassis is provided with round holes corresponding to the observation holes of the stress sensor mechanism one by one, through which the round holes and observation holes are used to observe the simulated coal seam in the experiment. state.

As a further preferred technical solution of the present invention, the stress sensor mechanism includes a bottom plate, a top plate, a wireless stress sensor, a load plate, a height adjustment screw and a locking screw, and the bottom plate and the top plate are respectively connected to the height adjustment screw. bottom and top, the wireless stress sensor is stacked on the top surface of the top plate, the bearing plate is stacked on the top surface of the wireless stress sensor, the observation hole is set on the bottom plate, and the locking The screw rod passes through the observation hole and the round hole on the chassis to realize the fixed connection of the stress sensor mechanism with the chassis, and can be used to observe the state of the simulated coal seam in the experiment after removing the locking screw rod.

As a further preferred technical solution of the present invention, a set of guide assemblies are provided on both sides of the height adjustment screw, the guide assemblies include a guide sleeve and a guide rod that are sleeved and matched, and the guide sleeve is connected to the bottom plate. The guide rod is connected with the top plate.

As a further preferred technical solution of the present invention, a locking mechanism is also provided between the supporting frame and the experimental frame, and the locking mechanism is used to lock and fix the experimental frame on the supporting frame after the adjustment of the rotation angle is completed. .

According to another aspect of the present invention, the present invention also provides an experimental method of a two-way adjustable three-dimensional physical similar simulation experiment platform, which includes the following steps:

1) The stress sensor mechanism is fixedly installed in the direction frame and fixedly connected with the chassis, and the inclination angle of the experimental frame is adjusted under the drive of the lifting drive mechanism to make the experimental frame reach the required true inclination angle, and driven by the rotating drive mechanism Next, adjust the rotation angle of the experimental frame on the support frame so that the experimental frame can achieve the desired pseudo-slope angle;

2) On the top surface of the stress sensor mechanism, according to the experimental requirements, the model material above the simulated coal seam is laid layer by layer to form a model, and the model is naturally air-dried after the laying is completed;

3) After the model is completely air-dried, carry out the simulation of coal seam mining, leave at least 20cm of protective coal pillars at the four boundaries of the model, determine the position of the cutting hole in the working face, the position of the roadway and the range of the mining area, and use the simulation cutting tool to simulate In coal mining, the height of the stress sensor mechanism is adjusted according to the preset advancing speed along the advancing direction from the cut hole to simulate the advancement of the coal seam. The observation hole in the mechanism is used to observe the roof collapse law in this area.

As a further preferred technical solution of the present invention, after step 2) is completed and before step 3) is performed, the following steps are also included:

Before the start of the experiment, calculate the static load that the model needs to simulate, and calculate the stress of the overlying rock layer. After the surface of the model is naturally air-dried, place a backing plate with the same size as the top surface of the model on the top of the model, and then according to the calculated stress. A counterweight of corresponding weight is placed on the backing plate to simulate the pressure of the overlying rock formation, and the formula for calculating the self-weight stress is as follows:

σ=γH

In the formula, σ is the self-gravity stress of the overlying rock, γ is the bulk density of the rock mass, and H is the thickness of the overlying rock.

Compared with the prior art, the two-way angle-adjustable three-dimensional physical similarity simulation experiment platform and the experiment method thereof of the present invention can easily complete the simulation experiments of near-horizontal, gently inclined coal seams and large dip angles and partly extremely inclined coal seams. The simulated inclination angle is 0-60 degrees, and it can also simulate the pseudo-inclined working surface, which solves the problem of establishing a pseudo-inclined working surface on a common experimental platform, and designs a liftable stress relief that fits the experimental platform. The sensor mechanism, through the preset observation hole in the stress sensor mechanism, facilitates the observation of the effect of the collapsed roof on the support, the size of the broken space of the roof in the goaf, and the shape of the collapse accumulation, etc., and effectively simplifies the process of physical similarity simulation experiments, and effectively The safety factor is improved, the scientificity and reliability of the experiment are improved, and it can be used repeatedly; in addition, the present invention satisfies the principle of similarity to the simulation experiment, greatly improves the accuracy of the experimental results, and can especially solve the problem of traditional It is difficult to adjust the inclination angle of the simulation test bench.

Description of drawings

The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

Fig. 1 is the three-dimensional schematic diagram of a perspective provided by the two-way angle-adjustable three-dimensional physical similarity simulation experiment platform of the present invention;

Fig. 2 is a three-dimensional schematic diagram of another viewing angle provided by the three-dimensional physical similarity simulation experiment platform with adjustable bidirectional angles of the present invention;

Fig. 3 is the side schematic diagram that the two-way angle adjustable three-dimensional physical similarity simulation experiment platform of the present invention provides;

Fig. 4 is the schematic front view provided by the two-way angle-adjustable three-dimensional physical similarity simulation experiment platform of the present invention;

Fig. 5 is a top view schematic diagram provided by the two-way adjustable three-dimensional physical similarity simulation experiment platform of the present invention;

Fig. 6 is a schematic diagram of the array distribution of the stress sensor mechanism in the experimental framework;

Fig. 7 is a schematic diagram of 45 degree true inclination adjustment;

Fig. 8 is a schematic diagram of a 10-degree pseudo bevel adjustment;

Fig. 9 is a schematic diagram of a pseudo-inclined working face;

Fig. 10 is a structural schematic diagram of the stress sensor mechanism.

In the figure: 1. Base, 2. Vertical support, 21. Motor, 22. Lead screw, 23. Vertical sliding guide device, 3. Support frame, 31. Horizontal sliding guide device, 4. Experimental frame, 41. Chassis , 42, direction frame, 5, stress sensor mechanism, 51, bottom plate, 52, height adjustment screw, 53, top plate, 54, wireless stress sensor, 55, bearing plate, 56, guide rod, 57, guide sleeve, 58, Observation hole, 59, locking screw rod.

The realization of the purpose, function and advantages of the present invention will be further described in conjunction with the embodiments and with reference to the accompanying drawings.

Detailed ways

The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments. Terms such as "upper", "lower", "left", "right", "middle" and "one" quoted in the preferred embodiment are only for convenience of description, and are not used to limit the scope of the present invention. The scope of implementation and the change or adjustment of its relative relationship shall also be regarded as the scope of implementation of the present invention without substantive changes in technical content.

As shown in Figures 1-10, the present invention provides a two-way angle-adjustable three-dimensional physical similarity simulation experiment platform, including a base 1, a support frame 3, a vertical support 2 and an experiment frame 4, wherein:

Described experimental frame 4 comprises chassis 41 and the direction frame body 42 that is fixedly arranged on described chassis 41, and this direction frame body 42 is enclosed and formed on chassis 41 by four baffle plates, and the size in this example is length * width × height (2000mm×2000mm×1000mm), the chassis 41 is rotatably arranged on the support frame 3 and is in transmission connection with the rotary drive mechanism provided on the support frame 3, and the rotary drive mechanism is used to drive the The test frame 4 rotates on the support frame 3, thereby changing the rotation angle of the test frame 4 on the support frame 3 to simulate the pseudo-inclination angle of the coal mining face. The distance between the support frame 3 and the test frame 4 A locking mechanism is also provided between them, and the locking mechanism is used to lock and fix the experimental frame 4 on the support frame 3 after the rotation angle adjustment is completed;

The vertical support 2 is erected on one side of the base 1, and the vertical support 2 is a gantry structure, and the vertical support 2 is erected on one side of the base 1 by two columns, and the two columns The top of the column is connected with a beam; the base 1 is provided with a horizontal slide guide 31, the vertical support 2 is provided with a vertical slide guide 23, and the front side of the support frame 3 is in contact with the horizontal slide The guide device 31 is slidably matched, and the rear side of the support frame 3 is slidably matched with the vertical sliding guide device 23. The vertical support 2 is provided with a lifting drive mechanism, and the lifting drive mechanism is connected to the support frame 3. The transmission connection is used to drive the support frame 3 to move under the guidance of the horizontal sliding guide device 31 and the vertical sliding guide device 23, thereby changing the inclination angle of the experimental frame 4 on the base 1 to simulate the coal mining face true inclination;

The directional frame body 42 of the experimental frame 4 is provided with a stress sensor mechanism 5 densely distributed in a row on the chassis 41 and the number is 20*20, and the height of the top surface of each stress sensor mechanism 5 is adjustable. Realize the simulated coal seam by adjusting the height of the stress sensor mechanism 5, the bottom of the stress sensor mechanism 5 is provided with an upward observation hole 58, and the observation hole 58 is used to observe the state of the simulated coal seam in the experiment, wherein the stress sensor mechanism The adjustable range of 5 is 100mm-150mm, and the stress sensor mechanism 5 is raised to a corresponding height to simulate a coal seam, and the thickness of the simulated coal seam is 0-50mm.

In a specific implementation, the vertical sliding guide device 23 includes two parallel cylindrical guide rods, and each of the cylindrical guide rods is vertically arranged close to one of the upright posts, and the horizontal sliding guide device includes two Parallel slide rails, the front side of the support frame 3 slides with the slide rails through rollers, the rear side of the support frame 3 slides with the cylindrical guide rods through pulleys, and the two cylindrical guide rods and the two slide rails are located on the left and right sides of the support frame 3 .

The lifting drive mechanism includes a motor 21 and two lead screws 22 that are transmission-connected to the motor 21. The two lead screws 22 are vertically arranged on the vertical support 2. The nuts of the lead screws 22 are connected with the The support frame 3 is connected, and the motor 21 drives the guide of the support frame 3 in the horizontal sliding guide device 31 and the vertical slide guide device 23 when the screw rod of the screw screw 22 is driven to rotate. down exercise. It should be noted here that the screw 22 includes a screw and a nut.

Preferably, circular holes corresponding to the observation holes 58 of the stress sensor mechanism 5 are penetrated through the chassis 41, through which the circular holes and the observation holes 58 are used to observe the state of the simulated coal seam in the experiment, In specific implementation, the observation can be realized by penetrating into the observation hole 58 with the help of an endoscope. The stress sensor mechanism 5 includes a bottom plate 51, a top plate 53, a wireless stress sensor 54, a load plate 55, a height adjustment screw 52 and a locking screw 59, and the bottom plate 51 and the top plate 53 are respectively connected to the height adjustment screw 52 The bottom and top of the wireless stress sensor 54 are stacked on the top surface of the top plate 53, the bearing plate 55 is stacked on the top surface of the wireless stress sensor 54, and the observation hole 58 is arranged on the bottom plate 51, the locking screw 59 passes through the observation hole 58 and the round hole on the chassis 41 to realize the fixed connection of the stress sensor mechanism 5 with the chassis 41, after removing the locking screw 59 It can be used to observe the state of the simulated coal seam in the experiment.

In another specific implementation, a set of guide assemblies are respectively provided on both sides of the height adjustment screw 52, and the guide assemblies include a guide sleeve 57 and a guide rod 56 that are sleeved and matched, and the guide sleeve 57 and the bottom plate 51 Connected, the guide rod 56 is connected with the top plate 53 .

The present invention also provides an experimental method for a two-way angle-adjustable three-dimensional physical similarity simulation experiment platform, comprising the following steps:

Step 1), the stress sensor mechanism 5 is fixedly installed in the direction frame body 42 and fixedly connected with the chassis 41, and the inclination angle of the experimental frame 4 is adjusted under the drive of the lifting drive mechanism so that the experimental frame 4 reaches the required true inclination angle , and the rotation angle of the experimental frame 4 on the support frame 3 is adjusted under the drive of the rotary drive mechanism so that the experimental frame 4 can reach the desired pseudo-inclination angle;

In the specific implementation, 20*20 stress sensor mechanisms 5 are used to arrange the entire bottom surface of the experimental frame 4 according to the array distribution, and the purpose of simulating the coal seam is achieved by adjusting the height of each stress sensor mechanism 5; then the inclination angle of the working face of the simulated coal seam is simulated is 45°, and the false pitch angle is 10°. Adjust the experimental frame 4 to 45° to complete the adjustment of the true inclination angle of the working surface, as shown in Figure 4, and then adjust the rotation angle of the experimental frame 4 on the support frame 3 10 degrees to complete the adjustment of the pseudo-inclined angle of the working face, as shown in Figure 5. At this time, the preparatory work before the experiment is completed. Figure 6 is the schematic diagram of the pseudo-inclined working face.

Step 2), on the top surface of the stress sensor mechanism 5, according to the experimental requirements, the model material above the simulated coal seam is laid layer by layer to form a model. After the model is laid, it is naturally air-dried, and the experiment can be carried out according to the experimental requirements;

Preferably, in order to further improve the scientificity and reliability of the experiment, in step 2) before laying the model, it is necessary to determine the angle of the coal rock layer, the thickness of each layer and the arrangement of the working face according to the corresponding geological data, and Determine the corresponding proportional relationship, and calculate the material ratio and thickness required for each layer, and use this as a basis for model laying.

Step 3), due to the limitation of the size of the model, it is difficult to simulate the laying of the model to the surface, and it is necessary to make up for the weight of the unsimulated overlying strata, as follows;

Before the start of the experiment, calculate the static load that the model needs to simulate, and calculate the stress of the overlying rock layer. After the surface of the model is naturally air-dried, place a backing plate with the same size as the top surface of the model on the top of the model, and then according to the calculated stress. A counterweight of corresponding weight is placed on the backing plate to simulate the pressure of the overlying rock formation, and the formula for calculating the self-weight stress is as follows:

σ=γH

In the formula, σ is the self-gravity stress of the overlying rock, γ is the bulk density of the rock mass, and H is the thickness of the overlying rock.

Step 4), after the model is completely air-dried and step 3) is completed, the simulation of coal seam mining is carried out, and at least 20cm of protective coal pillars are reserved at the four boundaries of the model to determine the position of the working face, the position of the roadway and the mining area range, use the simulated cutting tool to simulate coal mining, adjust the height of the stress sensor mechanism 5 according to the preset advancing speed from the cutting hole along the advancing direction to simulate the advancing of the coal seam, the height of the stress sensor mechanism 5 is lowered and the top There is a movement law on the surface, so that the collapse law of the top plate 53 in this area can be observed through the observation hole 58 in the stress sensor mechanism 5 . It should be noted here that the preset propulsion speed in this application can be specifically set according to actual needs, and no specific introduction will be made here.

In an embodiment of the three-dimensional physical similarity simulation experiment platform with adjustable bidirectional angles of the present invention, the length, width and height of the experimental area of the experimental frame 4 used are respectively 2000mm, 2000mm and 1000mm, and the maximum inclination angle that the experimental model can reach is 60° . In this example, the inclination angle of the coal seam is 45°, the false inclination angle is 10°, the length of the working face with the true inclination angle is _Ltrue , the length of the pseudo-inclined working face is _Lfalse , and the height difference of the coal seam is H, and it is calculated according to the following method:

The actual inclination angle ∠1 of the pseudo-sloping working face:

_Ltrue =H/sin45°;

_Lfalse = _Ltrue /cos10°=H/(sin45°×cos10°);

∠1＝H/L _pseudo ＝arcsin(sin45°×cos10°)＜45°

It can be seen that the actual inclination angle of the working face is less than 45°, and with the increase of the false inclination angle, the actual inclination angle of the coal seam will continue to decrease, which can effectively reduce the inclination effect of the working face.

The invention satisfies the principle of similarity in simulation experiments, greatly improves the accuracy of experimental results, and can especially solve the problems that the inclination angle of the traditional simulation test bench and the pseudo-inclination angle of the working face are difficult to adjust. In practical applications, there is no need to use the crane suspension, which saves labor, improves the safety factor, reduces the use of space, and takes a short time for the experiment. Not only can the physical similarity simulation experiment of the horizontal coal seam be carried out, but also the physical simulation of different coal seam inclination angles and pseudo-inclined working faces can be built The similar simulation experiment makes it easier to realize the coal seam dip angle and pseudo-inclined working face layout in the physical similar simulation experiment.

Although the specific embodiments of the present invention have been described above, those skilled in the art should understand that these are only examples, and various changes or modifications can be made to the embodiments without departing from the principle and essence of the present invention. The scope of protection is limited only by the appended claims.

Claims (9)

1. Two-way angularly adjustable three-dimensional physical analog simulation experiment platform, its characterized in that includes base, braced frame, vertical support and experimental frame, wherein:

the experimental frame comprises a chassis and a direction frame body fixedly arranged on the chassis, the chassis is arranged on the supporting frame and is in transmission connection with a rotary driving mechanism arranged on the supporting frame, and the rotary driving mechanism is used for driving the experimental frame to rotate on the supporting frame, so that the rotation angle of the experimental frame on the supporting frame is changed to simulate the pseudo-inclined angle of a coal face;

the vertical support is vertically arranged on one side of the base, a horizontal sliding guide device is arranged on the base, a vertical sliding guide device is arranged on the vertical support, the front side of the supporting frame is in sliding fit with the horizontal sliding guide device, the rear side of the supporting frame is in sliding fit with the vertical sliding guide device, a lifting driving mechanism is arranged on the vertical support, and is in transmission connection with the supporting frame and used for driving the supporting frame to move under the guidance of the horizontal sliding guide device and the vertical sliding guide device, so that the inclination angle of the experimental frame on the base is changed to simulate the true inclination angle of a coal face;

the experiment frame comprises an experiment frame body and is characterized in that a plurality of stress sensor mechanisms which are densely distributed on the chassis in a whole row are arranged in the direction frame body of the experiment frame body, the height of the top surface of each stress sensor mechanism is adjustable, a simulated coal bed is realized by adjusting the height of the stress sensor mechanism, and an upward observation hole is formed in the bottom of the stress sensor mechanism and used for observing the state of the simulated coal bed in an experiment.

2. The two-way angle-adjustable three-dimensional physical simulation experiment platform is characterized in that the vertical support is of a portal frame structure, the vertical support is erected on one side of the base through two upright posts, and the tops of the two upright posts are connected with a cross beam; the vertical sliding guide device comprises two parallel cylindrical guide rods, each cylindrical guide rod is close to one upright column, the smooth moving guide device comprises two parallel sliding rails, the front side of the supporting frame is in sliding fit with the sliding rails through rollers, the rear side of the supporting frame is in sliding fit with the cylindrical guide rods through pulleys, and the two cylindrical guide rods and the two sliding rails are located on the left side and the right side of the supporting frame.

3. The two-way angle-adjustable three-dimensional physical simulation experiment platform according to claim 1, wherein the lifting driving mechanism comprises a motor and two lead screws in transmission connection with the motor, the two lead screws are vertically arranged on the vertical support, nuts of the lead screws are connected with the supporting frame, and when the lead screws of the lead screws are driven to rotate by the motor, the supporting frame is driven to move under the guidance of the horizontal sliding guide device and the vertical sliding guide device.

4. The two-way angle-adjustable three-dimensional physical simulation experiment platform according to claim 1, wherein round holes corresponding to the observation holes of the stress sensor mechanism are penetrated through the chassis, and the state of the simulated coal bed is observed in the experiment through the round holes and the observation holes.

5. The two-way angle-adjustable three-dimensional physical analog simulation experiment platform according to claim 4, wherein the stress sensor mechanism comprises a bottom plate, a top plate, a wireless stress sensor, a bearing plate, a height adjusting screw and a locking screw, wherein the bottom plate and the top plate are respectively connected to the bottom and the top of the height adjusting screw, the wireless stress sensor is stacked on the top surface of the top plate, the bearing plate is stacked on the top surface of the wireless stress sensor, the observation hole is formed in the bottom plate, the locking screw penetrates through round holes in the observation hole and the chassis to fixedly connect the stress sensor mechanism with the chassis, and the locking screw is detached to be used for observing the state of the simulated coal seam in the experiment.

6. The two-way angle-adjustable three-dimensional physical simulation experiment platform according to claim 5, wherein a set of guide assemblies are respectively arranged on two sides of the height-adjusting screw, each guide assembly comprises a guide sleeve and a guide rod which are in sleeve connection and matched, the guide sleeve is connected with the bottom plate, and the guide rod is connected with the top plate.

7. The two-way angle-adjustable three-dimensional physical simulation experiment platform according to claim 1, wherein a locking mechanism is further arranged between the supporting frame and the experiment frame, and the locking mechanism is used for locking and fixing the experiment frame on the supporting frame after the rotation angle adjustment is completed.

8. An experimental method of a two-way angle-adjustable three-dimensional physical analogue simulation experiment platform according to any one of claims 1-7, comprising the following steps:

1) The stress sensor mechanism is fixedly arranged in the direction frame body and is fixedly connected with the chassis, the inclination angle of the experimental frame is adjusted under the drive of the lifting driving mechanism so as to enable the experimental frame to reach a required true inclination angle, and the rotation angle of the experimental frame on the supporting frame is adjusted under the drive of the rotation driving mechanism so as to enable the experimental frame to reach a required false inclination angle;

2) Paving model materials above the simulated coal bed layer by layer on the top surface of the stress sensor mechanism according to experimental requirements to form a model, and naturally airing after the model is paved;

3) After the model is completely air-dried, simulating coal seam exploitation, leaving at least 20cm of protection coal pillars at four boundaries of the model, determining the position of a working face open-cut hole, the position of a roadway and the mining area range, simulating coal mining by using a simulated cutting tool, performing height adjustment on a force sensor mechanism according to preset propelling speed along the propelling direction from the open-cut hole to simulate the propelling of the coal seam, and observing the roof collapse rule of the area through an observation hole in the force sensor mechanism after the height of the force sensor mechanism is reduced.

9. The method of claim 8, further comprising the steps of:

calculating static load to be simulated of the model before the experiment starts, calculating stress of the overlying strata, placing a pad plate with the size equivalent to the top surface of the model above the model after naturally air-drying the surface of the model, and placing a counterweight with the corresponding weight on the pad plate according to the calculated stress to simulate the pressure of the overlying strata, wherein the adopted dead weight stress has the following calculation formula:

σ＝γH

wherein sigma is the dead weight stress of the overlying strata, gamma is the volume weight of the rock mass, and H is the thickness of the overlying strata.

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