CN103500528B - A kind of Simulation Model demonstrating the dynamic change of seam mining top board - Google Patents

Abstract

The invention discloses a kind of Simulation Model demonstrating the dynamic change of seam mining top board, comprising: masonry beam module, be made up of the first masonry beam module (2), masonry beam main body (1) and the second masonry beam module (3); Immediate roof module, comprises the first immediate roof module (4) for supporting described first masonry beam module (2) and at least 4 the second immediate roof modules (5); For supporting the first false roof module (6) and the coal seam module (7) of described first immediate roof module (4); For supporting the baffle plate (8) of the second immediate roof module (5) described in rear portion, its height is lower than described coal seam module (7); Air bag (9), in the accommodation cavity be placed in described baffle plate (8), forming between described second immediate roof module (5) and coal seam module (7).System model dynamic demonstration seam mining of the present invention and top board structure change, make simple, workable, can also circulate demonstration.

Description

A kind of Simulation Model demonstrating the dynamic change of seam mining top board

Technical field

The present invention relates to a kind of coal mining visual ore deposit pressure and manifest comprehensive simulating model, be especially applicable to the teaching demonstration of roof structure dynamics change procedure in coal mining.

Background technology

In coal industry teaching, production and scientific research activity, ore deposit pressure manifests the core that activity is research, and the change of roof structure is the important content of all research, in order to make down-hole complexity again the change of invisible top board structure allow everyone understand, method main is at present the static schematic diagram of structure and the Structural Static states model that make top board.But these class methods cannot be illustrated ore deposit and press the process manifested; Few electric automatization model is not only difficult to reappear the concrete change procedure of top board, involves great expense simultaneously, is easy to damage.

Summary of the invention

The technical problem to be solved in the present invention overcomes existing ore deposit pressure of illustrating to manifest the shortcoming with top board structure variation model, provides that a kind of structure is simple, easy and simple to handle, illustrate top board structure change and the ore deposit of circulation demonstrating press the comprehensive simulating model that state manifests.

Demonstrate a Simulation Model for seam mining top board dynamic change, comprise and comprise coal seam module, false roof module, immediate roof module and masonry beam module from bottom to up successively;

Described masonry beam module is made up of the first masonry beam module, masonry beam main body and the second masonry beam module, wherein, the bottom-hinged of described masonry beam main body and described first masonry beam module, hinged with the top of described second masonry beam module;

Described immediate roof module comprises the first immediate roof module and at least 4 the second immediate roof modules, wherein, the bottom-hinged of first described second immediate roof module and the first immediate roof module, the bottom-hinged of the previous described second immediate roof module with it of the second immediate roof module described in front portion, the top of the previous described second immediate roof module with it of the second immediate roof module described in rear portion is hinged;

Described false roof module comprises the first false roof module and two described second false roof modules;

Described in rear portion, the bottom of the second immediate roof module is provided with baffle plate, and its height is lower than described coal seam module;

Air bag, be placed in described baffle plate, the accommodation cavity that formed between described second immediate roof module and coal seam module, the height after described airbag aeration equals described false roof module and described coal seam module sum.

The Simulation Model of demonstration seam mining top board of the present invention dynamic change, wherein said coal seam module, described first false roof module, is fixed by cementing agent between described first immediate roof module and described first masonry beam module;

In described spatial accommodation, be also provided with hydraulic module near module place, described coal seam, be also provided with spoil module in the bottom of described second masonry beam module; Described masonry beam module is made up of PVC material, described immediate roof module is made up of plastic foam, described first false roof module is made up of timber or PVC material, two described second false roof modules are made by having flexible deformable material, one of them is fixed on described coal seam module top, be positioned at the bottom of the 1st described second immediate roof module, described in another, the second false roof module is fixed on described hydraulic module.

The Simulation Model of demonstration seam mining top board of the present invention dynamic change, wherein said first immediate roof module, length be less than described first masonry beam module, and be greater than the length of described first false roof module, the length of described coal seam module is greater than described first masonry beam module, the length sum of multiple described second immediate roof module is greater than the length of described masonry beam main body, and the height of described hydraulic module is with the height of described coal seam module.

The Simulation Model of demonstration seam mining top board of the present invention dynamic change, wherein said second immediate roof module is 7, wherein, the bottom-hinged of the 1st described second immediate roof module and described first immediate roof module from left to right, the bottom-hinged of 2nd ~ 5 described second immediate roof modules previous described second immediate roof module with it, the 6th and the top of 7 described second immediate roof modules previous described second immediate roof module with it hinged; Described baffle plate is arranged at the bottom of the 7th described second immediate roof module.

The Simulation Model of demonstration seam mining top board of the present invention dynamic change, wherein said air bag comprises utricule and snorkel, described snorkel place near described utricule is provided with inflation/deflation switch, when described air bag is in inflated condition, support described multiple described second immediate roof module and the first immediate roof module draws a straight line and is horizontal; Described air bag is two, and the venting of two air bags represents the exploitation to coal seam.

The Simulation Model of demonstration seam mining top board of the present invention dynamic change, the difference of the length of wherein said coal seam module and described first false roof module is L ₁, the difference of the length of described first false roof module and described first immediate roof module is L ₂, the difference of the length of described first immediate roof module and described first masonry beam module is L ₃;

Described L1 is drawn by following formulae discovery:

$L_1=\mathrm{\ω}\sqrt{\frac{\mathrm{SCA}\underset{i}{\overset{n}{\mathrm{\Σ}}}{m}_i}{(S+C)\mathrm{kH}}}$

L ₁for the difference of the length of coal seam module and described first false roof module, m;

S is face length, m;

ω is contrast factor, i.e. the scale down of model;

H is dark for adopting, m;

N is main roof number;

K is factor of stress concentration;

M _ifor main roof thickness, m;

C is main roof First Weighting Interval of Main, m;

A is abutment pressure peak positional distance rib distance, m;

The distance A of described abutment pressure peak positional distance rib is drawn by following formulae discovery:

$A=\frac{{\mathrm{HL}}_b+\mathrm{SH}-2\mathrm{St}+(S-2C)(\frac{S}{2}-t-p)}{4H(0.5k+0.35)-2H}$

T is immediate roof rock stratum height, m;

P is main roof strata height, m;

Wherein, L _b=2L ₁+ S+2B

B＝H·cotθ

θ is strike angle of critical deformation.

The Simulation Model of demonstration seam mining top board of the present invention dynamic change, wherein said first false roof module near the minimum point A1 of the sidewall of side, goaf, described first immediate roof module near the minimum point B1 of the sidewall of side, goaf and described first masonry beam module near minimum point C1 tri-points of the sidewall of side, goaf all on same ellipse, elliptic equation is as follows:

$\frac{x^2}{{260}^2}+\frac{y^2}{{130}^2}=1$

Place, the bottom surface straight line of described first false roof module is x-axis, and initial point is 260cm apart from the distance of described A1,

L2 and L3 calculates by the following method:

Bring the height value of described first false roof module into described elliptic equation, the absolute value of the x coordinate value difference at the x coordinate figure obtained and A1 point place is L2;

The height of described first false roof module and described first immediate roof is added the value obtained and brings described elliptic equation into, the absolute value of the x coordinate value difference at the x coordinate figure obtained and B1 point place is L3.

The Simulation Model of demonstration seam mining top board of the present invention dynamic change, the height of wherein said spoil module and described baffle plate adopts following formulae discovery to obtain:

H _cash=k* (η h+h ₁+ h ₂)

H _gear=k* (η h+h ₁)

H _cashfor the accumulative height of spoil, cm;

H _gearfor height of baffle plate, cm;

K is broken expansion factor, generally gets 1.3;

η is coal residual coefficients, generally gets 0.2;

H is thickness of coal seam, cm;

H ₁be the first false roof module height, cm;

H ₂for immediate roof module height, cm.

The Simulation Model of demonstration seam mining top board of the present invention dynamic change, wherein also comprise the model casing holding described model, it is made up of transparent material; Described hinged finger is connected by hinge.

The Simulation Model of demonstration seam mining top board of the present invention dynamic change, wherein, ω is 0.024, and described model casing is of a size of 110cm × 20cm × 60cm; Described coal seam module is of a size of 35cm × 18cm × 12cm; Described first false roof module size is 20cm × 18cm × 5cm, described immediate roof module height is 8cm, the the first immediate roof module being of a size of 20.2cm × 18cm × 8cm by 1 and 7 the second immediate roof modules being of a size of 8cm × 18cm × 8cm form, described first masonry beam module is of a size of 21.3cm × 18cm × 22cm, and described masonry beam size of main body is 54cm × 18cm × 22cm; Described second masonry beam module is of a size of 18cm × 18cm × 22cm; The long 18cm of described air bag, diameter 17cm; Described baffle dimensions is 4cm × 18cm × 9.6cm; The height of described spoil module is 9.6cm.

The Simulation Model difference from prior art that the present invention demonstrates the dynamic change of seam mining top board is: the present invention is by the change to top board structure in reality production, provide the teaching demonstration of Simulation Model for roof structure dynamics change procedure in coal mining of a set of demonstration seam mining top board dynamic change, tool has the following advantages:

One, dynamic demonstration seam mining and top board structure change;

Two, simply affected, workable;

Three, circulation demonstrating.

Be described further below in conjunction with the Simulation Model of accompanying drawing to demonstration seam mining top board of the present invention dynamic change.

Accompanying drawing explanation

Top board structure change schematic diagram when Fig. 1 is working face mining during reality is produced;

Top board structure change schematic diagram when Fig. 2 is the Simulation Model demonstration working face mining of demonstration seam mining top board of the present invention dynamic change;

Fig. 3 is that the Simulation Model of demonstration seam mining top board of the present invention dynamic change demonstrates top board structure change schematic diagram when workplace is unminded;

Fig. 4 is the structural representation of air bag of the present invention;

Fig. 5 is the schematic diagram of the ellipse at each breakaway poing place in reality exploitation;

Fig. 6 is the schematic diagram of the ellipse at each breakaway poing place in model of the present invention.

Embodiment

Embodiment 1

As top board structure change schematic diagram when Fig. 1 is working face mining during reality is produced, the present invention, by the change to top board structure in reality production, provides the teaching demonstration of Simulation Model for roof structure dynamics change procedure in coal mining of a set of demonstration seam mining top board dynamic change.

As shown in Figures 2 and 3, a kind of Simulation Model demonstrating the dynamic change of seam mining top board of the present invention, comprises and comprises coal seam module 7, false roof module, immediate roof module and masonry beam module from bottom to up successively;

Described masonry beam module is made up of the first masonry beam module 2, masonry beam main body 1 and the second masonry beam module 3, wherein, the bottom-hinged of described masonry beam main body 1 and described first masonry beam module 2, hinged with the top of described second masonry beam module 3;

Described backform block comprises the first immediate roof module 4 and at least 4 the second immediate roof modules 5 for supporting described first masonry beam module 2, described in the present embodiment, the second immediate roof module 5 is 7, concrete quantity can adjust according to demand, wherein, the bottom-hinged of the 1st described second immediate roof module 5 and described first immediate roof module 4, the bottom-hinged of 2nd ~ 5 described second immediate roof modules 5 previous described second immediate roof module 5 with it, the 6th and the top of 7 described second immediate roof modules 5 previous described second immediate roof module 5 with it hinged;

Described false roof module comprises the first false roof module 6 and two described second false roof modules 13;

For supporting the baffle plate 8 of the second immediate roof module 5 described in rear portion, its height is lower than described coal seam module 7;

Air bag 9, in the accommodation cavity be placed in described baffle plate 8, forming between described second immediate roof module 5 and coal seam module 7, described accommodation cavity is used for representing the goaf in production.

The hinged hinged effect that can be any device and be formed of the present invention, as hinge 14.

Described coal seam module 7, described first false roof module 6, to be fixed by cementing agent between described first immediate roof module 4 and described first masonry beam module 2; Hydraulic module 12 is also provided with near module 7 place, described coal seam in described spatial accommodation, the hydraulic support be used in simulating reality production, spoil module 10 is also provided with in the bottom of described second masonry beam module 3, the spoil bag of filling after simulation mining, demonstration is made more to press close to production practices, vividly vivider.

The length of described first immediate roof module 4 is less than described first masonry beam module 2, and be greater than the length of described first false roof module 6, the length of described coal seam module 7 is greater than described first masonry beam module 2, the length sum of multiple described second immediate roof module 5 is greater than the length of described masonry beam main body 1, and the height of described hydraulic module 12 is with the height of described coal seam module 7.

Described masonry beam module is made by heavier material, as PVC material, by self gravitation effect, when not having supporting power below described air bag 9 deflation status, forms " masonry beam " structure, when described air bag 9 is inflated and restored, restores by below supporting power effect; Described immediate roof module is made by lighter material, as plastic foam, be made up of multiple second immediate roof module 5, connected by hinge 14 each other, except latter two link position, up, hinge 14 link position described in all the other between the second immediate roof module 5 is in below, can bend at interlude, latter two the second immediate roof module 5 plays a supportive role, contacts, can control immediate roof module largest amount of subsidence with broken swollen coefficient baffle plate 8.Described first false roof module 6 is made by harder material, such as timber or PVC material, need bear all module weight in top; Described second false roof module is made up of deformable resilient material, as sponge, one of them is fixed on described coal seam module top, and be positioned at the bottom of the 1st described second immediate roof module 5, described in another, the second false roof module 13 is fixed on described hydraulic module 12.In the present embodiment, described baffle plate 8 is arranged at the bottom of the 7th described second immediate roof module 5.Described system model also comprises the model casing 11 holding described model, and it is made up of transparent material, plays the effect of protection model, simultaneously also convenient transport.

Described air bag 9 is two, as shown in Figure 4, described air bag 9 comprises utricule and snorkel 13, described snorkel 13 place near described utricule is provided with inflation/deflation switch 14, when described air bag is in inflated condition, support described multiple described second immediate roof module 5 and the first immediate roof module 4 is linked to be a rectangular structure and is horizontal, now the first masonry beam module 1 of described masonry beam module, masonry beam main body 2 and the second masonry beam module 3 are also linked to be a large rectangular structure and are in horizontality, represent in teaching demonstration coal seam unmind situation under top board structure.After described air bag 9 is exitted, described masonry beam module and multiple described second immediate roof module 5 are without support, cave in downwards under gravity, described in latter two, the second immediate roof module 5 drops on described baffle plate 8, described second masonry beam module 3 drops in described spoil module 10, in teaching demonstration, be used for simulating the situation of change of top board after seam mining, simulation be the situation of Fig. 1 during reality is produced.In the present invention, coal seam module 7 represents coal seam to be exploited, and what described air bag 9 represented is the coal seam of exploiting, and represent after venting that coal seam herein was exploited, two described air bag 9 deflation sequences illustrate seam mining direction.

Described air bag 9 inflation/deflation is all completed by inflation/deflation switch 14, and be in when being full of gaseity when air bag 9 represents coal seam, inflation/deflation switch 14 is in closure state; When air bag 9 represents that coal seam represents exploitation state, air bag starts venting, and inflation/deflation switch 14 starts to open; When needs inflation recovers original state, inflation/deflation switch 14 is first in open mode, utilizes inflator to inflate from snorkel 13 toward air bag 9, first Closing Switch when having inflated, then takes inflator away.

Following account form is all that the concrete condition in producing with reality calculates actual numerical value and scaled, obtains the specification of model various piece:

Described coal seam module 7 is L with the difference of the length of described first false roof module 6 ₁, described first false roof module 6 is L with the difference of the length of described first immediate roof module 4 ₂, the difference of the length of described first immediate roof module 4 and described first masonry beam module 2 is L ₃;

Described L1 is drawn by following formulae discovery:

$L_1=\mathrm{\ω}\sqrt{\frac{\mathrm{SCA}\underset{i}{\overset{n}{\mathrm{\Σ}}}{m}_i}{(S+C)\mathrm{kH}}}$

L ₁for coal seam module 7 and the difference of the length of described first false roof module 6, cm; S is face length, m; ω is contrast factor, i.e. the scale down of model; H is dark for adopting, m; N is main roof number; K is factor of stress concentration; m _ifor main roof thickness, m; C is main roof First Weighting Interval of Main, m; A is abutment pressure peak positional distance rib distance, m; The distance A of described abutment pressure peak positional distance rib is drawn by following formulae discovery:

$A=\frac{{\mathrm{HL}}_b+\mathrm{SH}-2\mathrm{St}+(S-2C)(\frac{S}{2}-t-p)}{4H(0.5k+0.35)-2H}$

T is immediate roof rock stratum height, m; P is main roof strata height, m;

Wherein, L _b=2L ₁+ S+2B

B＝H·cotθ

θ is strike angle of critical deformation.

As shown in Figure 5, in reality exploitation, first breakaway poing in the close goaf of false roof, immediate roof, masonry beam is all on same ellipse.Show it model of the present invention is also consistent, as shown in Figure 6, described first false roof module 6 near the minimum point A1 of the sidewall of side, goaf, described first immediate roof module 4 near the minimum point B1 of the sidewall of side, goaf and described first masonry beam module 2 near minimum point C1 tri-points of the sidewall of side, goaf all on same ellipse, elliptic equation is as follows:

$\frac{x^2}{{260}^2}+\frac{y^2}{{130}^2}=1$

Place, the bottom surface straight line of described first false roof module 6 is x-axis, and initial point is 260cm apart from the distance of described A1,

L2 and L3 calculates by the following method:

Bring the height value of described first false roof module 6 into described elliptic equation, the absolute value of the x coordinate value difference at the x coordinate figure obtained and A1 point place is L2;

The height of described first false roof module 6 and described first immediate roof 4 is added the value obtained and brings described elliptic equation into, the absolute value of the x coordinate value difference at the x coordinate figure obtained and B1 point place is L3.

The height of described spoil module 10 and described baffle plate 8 adopts following formulae discovery to obtain:

H _cash=k* (η h+h ₁+ h ₂)

H _gear=k* (η h+h ₁)

H _cashfor the accumulative height of spoil, m; H _gearfor height of baffle plate, m; K is broken expansion factor; η is coal residual coefficients; H is thickness of coal seam, m; h ₁be the first false roof module height, m; h ₂for immediate roof module height, m;

General thickness of coal seam is actual is 5m, in the present embodiment, in model, corresponding ratio (model scale down) is 0.024, calculate 12cm, the height ratio of modules is for summing up according to engineering experience, for making modelling effect image, consider the suitable size of model, do correction to a certain degree and idealized hypothesis, and calculate and be defined as: described coal seam module 7 highly for 12cm, described first false roof module 6 is highly 5cm, described immediate roof module height is 8cm, described masonry beam module height is 22cm.

The wide representative of modules be the length of workplace, when considering the suitable size of model and do not affect practical manifestation effect, model width narrows down to 20cm, modules reduced width is to 18cm, the safe distance of 1cm is respectively left in front and back, prevent from module and model casing 11 inwall from producing to rub, affect result of use.

In the present embodiment, S is 160m; ω is 0.024; H is 300m; N is 1; K is 3; m _ifor 9.1m; C is 32m; A is 35m; T is 4m; P is 9m; θ is 75 °, and the length calculating L1 is thus 0.2cm;

As shown in Figure 5, place, the bottom surface straight line of described first false roof module 6 is x-axis, initial point is 260cm apart from the distance of described A1, namely A1 coordinate is (-260,0), immediate roof breaking part base point height value is brought into, what namely bring into is the height value of false roof module, draws B1 coordinate for (-259.8,5), then illustrate that the difference between the first false roof module 6 and immediate roof is 0.2cm, in like manner, show that C1 coordinate is for (-258.7,13), then illustrate that the difference between immediate roof and false roof is 260-258.7=1.3cm

So show that the first false roof module 6 length is for being 20cm(reference value), the first immediate roof module 4 length is 20.2cm, and the first masonry beam module 2 length is 21.3cm.

And calculate H _gearfor 9.6m; K is broken expansion factor, gets 1.3; η is coal residual coefficients, gets 0.2; H is thickness of coal seam, 12cm; h ₁be the first false roof module 6 height, 5cm; h ₂for immediate roof module height, 8cm;

Calculate, H _cash=1.3*(12*0.2+5+8)=20cm.

The following specification of the various piece of the present embodiment model is finally obtained: described model casing 11 is of a size of 110cm × 20cm × 60cm by said method; Described coal seam module 7 is of a size of 35cm × 18cm × 12cm; Described first false roof module 6 is of a size of 20cm × 18cm × 5cm, described immediate roof module height is 8cm, the the first immediate roof module 4 being of a size of 20.2cm × 18cm × 8cm by 1 and 7 the second immediate roof modules 5 being of a size of 8cm × 18cm × 8cm form, described first masonry beam module 2 is of a size of 21.3cm × 18cm × 22cm, and described masonry beam main body 1 is of a size of 54cm × 18cm × 22cm; Described second masonry beam module 3 is of a size of 18cm × 18cm × 22cm; The long 18cm of described air bag 9, diameter 17cm; Described baffle plate 8 is of a size of 4cm × 18cm × 9.6cm; The height of described spoil module 10 is 9.6cm.

System model dynamic demonstration seam mining of the present invention and top board structure change, make simple, workable, can also circulate demonstration, vivid, is highly suitable for applying in teaching demonstration, has wide market outlook.

Above-described embodiment is only be described the preferred embodiment of the present invention; not scope of the present invention is limited; under not departing from the present invention and designing the prerequisite of spirit; the various distortion that those of ordinary skill in the art make technical scheme of the present invention and improvement, all should fall in protection domain that claims of the present invention determines.

Claims (5)

1. demonstrate a Simulation Model for seam mining top board dynamic change, it is characterized in that: comprise and comprise coal seam module (7), false roof module, immediate roof module and masonry beam module from bottom to up successively;

Described masonry beam module is made up of the first masonry beam module (2), masonry beam main body (1) and the second masonry beam module (3), wherein, the bottom-hinged of described masonry beam main body (1) and described first masonry beam module (2), hinged with the top of described second masonry beam module (3);

Described immediate roof module comprises the first immediate roof module (4) and 7 the second immediate roof modules (5), wherein, the bottom-hinged of the 1st described second immediate roof module (5) and described first immediate roof module (4) from left to right, the bottom-hinged of 2nd ~ 5 described second immediate roof modules (5) previous described second immediate roof module (5) with it, the 6th and the top of 7 described second immediate roof modules (5) previous described second immediate roof module (5) with it hinged; Described false roof module comprises the first false roof module (6) and two the second false roof modules (13);

Described in rear portion, the bottom of the second immediate roof module (5) is provided with baffle plate (8), and its height is lower than described coal seam module (7); Described baffle plate (8) is arranged at the bottom of the 7th described second immediate roof module (5);

Air bag (9), in the accommodation cavity be placed in described baffle plate (8), forming between described second immediate roof module (5) and coal seam module (7), the height after described air bag (9) inflation equals described false roof module and described coal seam module (7) sum;

Described coal seam module (7), described first false roof module (6), to be fixed by cementing agent between described first immediate roof module (4) and described first masonry beam module (2);

In described accommodation cavity, be also provided with hydraulic module (12) near module (7) place, described coal seam, be also provided with spoil module (10) in the bottom of described second masonry beam module (3); Described masonry beam module is made up of PVC material, described immediate roof module is made up of plastic foam, described first false roof module (6) is made up of timber or PVC material, two described second false roof modules (13) are made by having flexible deformable material, one of them is fixed on described coal seam module top, be positioned at the bottom of the 1st described second immediate roof module (5), described in another, the second false roof module (13) is fixed on described hydraulic module (12);

The length of described first immediate roof module (4) is less than described first masonry beam module (2), and be greater than the length of described first false roof module (6), the length in described coal seam module (7) is greater than described first masonry beam module (2), the length sum of multiple described second immediate roof module (5) is greater than the length of described masonry beam main body (1), and the height of described hydraulic module (12) is with the height in described coal seam module (7);

Described coal seam module (7) is L with the difference of the length of described first false roof module (6) ₁, described first false roof module (6) is L with the difference of the length of described first immediate roof module (4) ₂, the difference of the length of described first immediate roof module (4) and described first masonry beam module (2) is L ₃;

Described L ₁drawn by following formulae discovery:

$L_1=\mathrm{\ω}\sqrt{\frac{SCA\underset{i}{\overset{n}{\Σ}}{m}_i}{(S+C)kH}}$

L ₁for coal seam module (7) and the difference of the length of described first false roof module (6), unit: m;

S is face length, unit: m;

ω is contrast factor, i.e. the scale down of model;

H is dark for adopting, unit: m;

N is main roof number;

K is factor of stress concentration;

M _ifor main roof thickness, unit: m;

C is main roof First Weighting Interval of Main, unit: m;

A is abutment pressure peak positional distance rib distance, unit: m;

The distance A of described abutment pressure peak positional distance rib is drawn by following formulae discovery:

$A=\frac{{\mathrm{HL}}_b+SH-2St+(S-2C)(\frac{S}{2}-t-p)}{4H(0.5k+0.35)-2H}$

T is immediate roof rock stratum height, unit: m;

P is main roof strata height, unit: m;

Wherein, L _b=2L ₁+ S+2B

B＝H·cotθ

θ is strike angle of critical deformation.

2. the Simulation Model of demonstration seam mining top board according to claim 1 dynamic change, is characterized in that:

Minimum point C1 tri-points of the minimum point B1 of the sidewall of the minimum point A1 of the sidewall of the close side, goaf of described first false roof module (6), the close side, goaf of described first immediate roof module (4) and the sidewall of the close side, goaf of described first masonry beam module (2) are all on same ellipse, and elliptic equation is as follows:

$\frac{x^2}{{260}^2}+\frac{y^2}{{130}^2}=1$

Place, the bottom surface straight line of described first false roof module (6) is x-axis, and initial point is 260cm apart from the distance of described A1,

L ₂and L ₃calculate by the following method:

Bring the height value of described first false roof module (6) into described elliptic equation, the absolute value of the x coordinate value difference at the x coordinate figure obtained and A1 point place is L ₂;

The height of described first false roof module (6) and described first immediate roof module (4) is added the value obtained and brings described elliptic equation into, the absolute value of the x coordinate value difference at the x coordinate figure obtained and B1 point place is L ₃.

3. the Simulation Model of demonstration seam mining top board according to claim 2 dynamic change, is characterized in that:

The height of described spoil module (10) and described baffle plate (8) adopts following formulae discovery to obtain:

H _cash=k* (η h+h ₁+ h ₂)

H _gear=k* (η h+h ₁)

H _cashfor the accumulative height of spoil, unit: cm;

H _gearfor height of baffle plate, unit: cm;

K is broken expansion factor, generally gets 1.3;

η is coal residual coefficients, generally gets 0.2;

H is thickness of coal seam, unit: cm;

H ₁be the first false roof module height, unit: cm;

H ₂for immediate roof module height, unit: cm.

4. the Simulation Model of demonstration seam mining top board according to claim 3 dynamic change, is characterized in that: also comprise the model casing (11) holding described model, it is made up of transparent material; Described hinged finger is connected by hinge (14).

5. the Simulation Model of demonstration seam mining top board according to claim 4 dynamic change, is characterized in that:

ω is 0.024, and described model casing (11) is of a size of 110cm × 20cm × 60cm; Described coal seam module (7) is of a size of 35cm × 18cm × 12cm; Described first false roof module (6) is of a size of 20cm × 18cm × 5cm, described immediate roof module height is 8cm, the the first immediate roof module (4) being of a size of 20.2cm × 18cm × 8cm by 1 and 7 the second immediate roof modules (5) being of a size of 8cm × 18cm × 8cm form, described first masonry beam module (2) is of a size of 21.3cm × 18cm × 22cm, and described masonry beam main body (1) is of a size of 54cm × 18cm × 22cm; Described second masonry beam module (3) is of a size of 18cm × 18cm × 22cm; Described air bag (9) long 18cm, diameter 17cm; Described baffle plate (8) is of a size of 4cm × 18cm × 9.6cm; The height of described spoil module (10) is 9.6cm.