CN103510984A - Method for designing filling mining mass ratio of solid filling and coal mining - Google Patents

Abstract

The invention discloses a method for designing the filling mining mass ratio of solid filling and coal mining. According to the principle that the volume of coal mining space is equal to that of the space of the filled solid filling materials, the designed filling mining mass ratio is equal to the designed density ratio of the solid filling materials to raw coal, the density [rho]c of the raw coal is directly measured through on-site sampling, and the density [rho]t of the solid filling materials under the action of a compaction force [sigma]t is obtained through fitting of laboratory test and data, and is obtained by the following steps: calculating the density [rho]0 of the solid filling materials before compaction; performing a compression test on the solid filling materials; drawing an epsilon-sigma curve; fitting the curve according to a correlation coefficient R2 to obtain an epsilon-stress rho function relationship; obtaining a solid filling material density-stress relationship according to the law of mass conservation; finally obtaining the density [rho]t of the filling body under the pressure of [sigma]t, so that the filling mining mass ratio is obtained through designing. According to the method, the proportional relationship between the filling quantity and the coal mining quantity of solid filling and coal mining is quantitatively determined, and the result can provide a theoretical basis for designing the fullness ratio of the whole filling working surface.

Description

Solid filling is mined to fill and is adopted quality and compare method for designing

Technical field

The present invention relates to filling coal mining technology, particularly solid filling is mined and is filled the method for designing of adopting mass ratio.

Background technology

Solid filling coal-mining technique is as the coal-mining method of a kind of goaf whole fill, when utilizing underground goaf to process the solid waste such as gangue, flyash, coal is pressed in liberation " three times ", both colliery solid waste ground release, liberation mine hoisting ability had been reduced, can alleviate again mining subsidence disaster, improve resource recovery, become a key technology that realizes the green exploitation in colliery.In solid filling coal-mining technique, after coal is plucked out of, solid filling material is delivered to down-hole by the vertical jettison system of solid filling material, then through haulage devices such as down-hole ribbon conveyer, elevating conveyors, be transported to goaf, by crucial stowage units such as porous bottom-dump conveyer, filling coal mining hydraulic support, reinforcement mechanisms, realize the sold stowing in goaf.In stowing operation, the supply of solid filling material is one of key factor determining solid filling coal mining filling effect, if solid filling material supply is insufficient, will have a strong impact on the control effect of obturation to strata movement.If can grasp in time the mass ratio of solid filling material and coal produced quantity, not only contribute to improve filling effect, and can control theoretical foundation is provided for the whole filling operation face rate of enriching.Therefore, studying a kind of solid filling mines to fill and adopts quality and become and implemented research means and the research method that solid filling coal-mining technique could be not scarce than method for designing.

Summary of the invention

The object of the invention is for above-mentioned technical problem, provide a kind of method simple, accurately, solid filling is mined to fill and adopted quality and compare method for designing reliably.

In order to solve above-mentioned technical barrier, solid filling provided by the present invention is mined to fill and is adopted quality and compare method for designing, it is characterized in that the principle of utilizing coal extraction space to equate with the solid filling material spatial volume being filled with, design is filled and is adopted mass ratio equivalence and design the density of solid filling material and the density ratio of raw coal, and its design is as follows:

Fill and adopt mass ratio e at compacting power σ _tsolid filling material density ρ under effect _tdensity p with raw coal _cratio, that is:

$e=\frac{{\mathrm{\ρ}}_t}{{\mathrm{\ρ}}_c}---\left(1\right);$

In formula, the density p of raw coal _cby field sampling, measure; Solid filling material is at compacting power σ _tdensity p under effect _tby laboratory test and data fitting, calculated and obtained, obtaining step is as follows:

A, determine the initial work loading height h of solid filling material in steel cylinder, charging quality m ₀and steel cylinder cross-sectional area A;

Density p before b, the compacting of calculating solid filling material ₀, that is:

${\mathrm{\ρ}}_0=\frac{m_0}{\mathrm{Ah}}---\left(2\right);$

C, employing servo testing machine carry out compression test to solid filling material, record stress σ and strain stress in loading procedure;

D, drafting ε-σ curve, by coefficient R ²curve is carried out to matching and obtain the strain stress-stress sigma function relation in solid filling material compacting process, that is:

ε＝ε(σ) (3)；

E, according to mass conservation law ρ in compacting process ₀ah=ρ (σ) Ah (1-ε (σ)), obtains density p-stress sigma function relation in solid filling material compacting process, that is:

$\mathrm{\ρ}\left(\mathrm{\σ}\right)=\frac{{\mathrm{\ρ}}_0}{(1-\mathrm{\ϵ}\left(\mathrm{\σ}\right))}=\frac{m_0}{\mathrm{Ah}(1-\mathrm{\ϵ}\left(\mathrm{\σ}\right))}---\left(4\right);$

F, when solid filling material is filled into behind goaf, solid filling material is subject to the compacting power σ from reinforcement mechanism _t, form closely knit obturation, according to the relational expression in step e (4), obtain this obturation at compacting power σ _tunder density p _t:

${\mathrm{\ρ}}_t=\frac{m_0}{\mathrm{Ah}(1-\mathrm{\ϵ}\left({\mathrm{\σ}}_t\right))}---\left(5\right).$

Described strain-stress relation matching requires coefficient R ²be not less than 0.95; The compacting power σ of described reinforcement mechanism _tscope is 1.5～2.5MPa.

Beneficial effect: the density of filler, as the important parameter of himself, is the important parameter of analyzing charging quantity and coal mining output proportionate relationship.The present invention carries out field sampling to carrying out the mine of solid filling coal mining, the spoil that sampling is obtained is mixed with solid filling material, solid filling material is carried out to compactingproperties test, can determine more exactly solid filling coal mining stowing ratio, be the filler quality that every extraction 1t coal needs filling, thereby can provide theoretical foundation for whole filling operation face supply solid filling material.The method is simple, and cost is low, and test effect is good, has practicality widely.

Accompanying drawing explanation

Fig. 1 is that solid filling is mined to fill and adopted quality than method for designing schematic diagram;

Fig. 2 is strain-stress matched curve in example solid filling material compacting process;

Fig. 3 is density-stress curve in example solid filling material compacting process.

The specific embodiment

Below in conjunction with accompanying drawing, one embodiment of the present of invention are further described:

Solid filling of the present invention is mined to fill and is adopted quality than method for designing, the principle of utilizing coal extraction space to equate with the solid filling material spatial volume being filled with, and design is filled and is adopted the density ratio that mass ratio equivalence designs solid filling material and raw coal.

Be illustrated in figure 1 solid filling of the present invention and mine to fill and adopt quality than method for designing schematic diagram, in figure, show according to density-stress function relation in solid filling material compacting process, obtain axial stress σ _t(its value is determined by the filling key equipment of concrete mine) corresponding compacted density ρ _t, with the density p of raw coal _ccompare, obtaining mines to fill at certain solid filling enriching under rate condition adopts mass ratio.Fill and adopt mass ratio e by enriching the solid filling material density ρ under rate condition _tdensity p with raw coal _cratio:

$e=\frac{{\mathrm{\ρ}}_t}{{\mathrm{\ρ}}_c}---\left(1\right);$

In formula, the density p of raw coal _cby field sampling, measure; Solid filling material is in the density p of enriching under rate condition _tby laboratory test and data fitting, calculated and obtained, obtaining step is as follows:

A, determine the initial work loading height h of solid filling material in steel cylinder, charging quality m ₀and steel cylinder cross-sectional area A;

Density p before b, the compacting of calculating solid filling material ₀, that is:

${\mathrm{\ρ}}_0=\frac{m_0}{\mathrm{Ah}}---\left(2\right);$

C, employing servo testing machine carry out compression test to solid filling material, record stress σ and strain stress in loading procedure;

D, drafting ε-σ curve, by coefficient R ²curve is carried out to matching and obtain the strain stress-stress sigma function relation in solid filling material compacting process, that is:

ε＝ε(σ) (3)；

Described strain-stress relation matching requires coefficient R ²be not less than 0.95;

E, according to mass conservation law ρ in compacting process ₀ah=ρ (σ) Ah (1-ε (σ)), obtains density p-stress sigma function relation in solid filling material compacting process, that is:

$\mathrm{\ρ}\left(\mathrm{\σ}\right)=\frac{{\mathrm{\ρ}}_0}{(1-\mathrm{\ϵ}\left(\mathrm{\σ}\right))}=\frac{m_0}{\mathrm{Ah}(1-\mathrm{\ϵ}\left(\mathrm{\σ}\right))}---\left(4\right);$

F, when solid filling material is filled into behind goaf, solid filling material is subject to the compacting power σ from reinforcement mechanism _t, become the obturation with substantial rate, according to the relational expression in step e (4), obtain this obturation at compacting power σ _tunder density p _t:

${\mathrm{\ρ}}_t=\frac{m_0}{\mathrm{Ah}(1-\mathrm{\ϵ}\left({\mathrm{\σ}}_t\right))}---\left(5\right).$

The compacting power σ of described reinforcement mechanism _tscope is 1.5～2.5MPa.

It is as follows that embodiment 1 ,Yi Mou ore deposit is that example designs:

Fill and adopt mass ratio e at compacting power σ _tsolid filling material density ρ under effect _tdensity p with raw coal _cratio design, that is:

$e=\frac{{\mathrm{\ρ}}_t}{{\mathrm{\ρ}}_c}=1.37---\left(1\right);$

In formula, the density p of raw coal _cby field sampling, be determined as ρ _c=1425kg/m ³; Solid filling material is at compacting power σ _tdensity p under effect _t=1947kg/m ³by laboratory test and data fitting, calculated and obtained, obtaining step is as follows:

A, determine the initial work loading height h=0.1296m of solid filling material in steel cylinder, charging quality m ₀=8.665kg and steel cylinder cross-sectional area A=π r ²=0.0491m ²;

Density p before b, the compacting of calculating solid filling material ₀, that is:

${\mathrm{\&rho;}}_0=\frac{{\mathrm{<figure-callout\; id="0"\; label="m"\; filenames="HDA0000400672860000011.png,HDA0000400672860000012.png"\; state="\{\{state\}\}">m</figure-callout>}}_0}{\mathrm{Ah}}=1362\mathrm{kg}/m^3---\left(2\right)$

C, employing servo testing machine carry out compression test to solid filling material, record stress σ and strain stress in loading procedure;

D, drafting ε-σ curve, as shown in Figure 2, require coefficient R ²be not less than 0.95 pair of curve and carry out matching and obtain the strain stress-stress sigma function relation in solid filling material compacting process, that is:

ε＝0.04332ln(512.3σ+0.9988) (3)；

E, according to mass conservation law ρ in compacting process ₀ah=ρ (σ) Ah (1-ε (σ)), obtains density p-stress sigma function relation in solid filling material compacting process, that is:

$\mathrm{\&rho;}\left(\mathrm{\&sigma;}\right)=\frac{{\mathrm{\&rho;}}_0}{(1-\mathrm{\&epsiv;}\left(\mathrm{\&sigma;}\right))}=\frac{1362}{(1-0.04332\ln (512.3\mathrm{\&sigma;}+0.9988))}---\left(4\right);$

F, when solid filling material is filled into behind goaf, solid filling material is subject to the compacting power from reinforcement mechanism, forms the compacting power σ of closely knit obturation ，Yang village ore deposit filling hydraulic support reinforcement mechanism ₂=2MPa, according to step e Chinese style (4), obtains the density p of this obturation under 2MPa pressure ₂, as shown in Figure 3, that is:

${\mathrm{\&rho;}}_2=\frac{{\mathrm{<figure-callout\; id="0"\; label="m"\; filenames="HDA0000400672860000011.png,HDA0000400672860000012.png"\; state="\{\{state\}\}">m</figure-callout>}}_0}{\mathrm{Ah}(1-\mathrm{\&epsiv;}\left(2\right))}=1947\mathrm{kg}/m^3---\left(5\right).$

Claims (3)

1. a solid filling is mined to fill and is adopted quality and compare method for designing, it is characterized in that the principle of utilizing coal extraction space to equate with the solid filling material spatial volume being filled with, design is filled and is adopted mass ratio equivalence and design the density of solid filling material and the density ratio of raw coal, and its design is as follows:

Fill and adopt mass ratio e at compacting power σ _tsolid filling material density ρ under effect _tdensity p with raw coal _cratio, that is:

$e=\frac{{\mathrm{\&rho;}}_t}{{\mathrm{\&rho;}}_c}---\left(1\right);$

In formula, the density p of raw coal _cby field sampling, measure; Solid filling material is at compacting power σ _tdensity p under effect _tby laboratory test and data fitting, calculated and obtained, obtaining step is as follows:

A, determine the initial work loading height h of solid filling material in steel cylinder, charging quality m ₀and steel cylinder cross-sectional area A;

Density p before b, the compacting of calculating solid filling material ₀, that is:

${\mathrm{\&rho;}}_0=\frac{m_0}{\mathrm{Ah}}---\left(2\right);$

C, employing servo testing machine carry out compression test to solid filling material, record stress σ and strain stress in loading procedure;

D, drafting ε-σ curve, by coefficient R ²curve is carried out to matching and obtain the strain stress-stress sigma function relation in solid filling material compacting process, that is:

ε＝ε(σ) (3)；

E, according to mass conservation law ρ in compacting process ₀ah=ρ (σ) Ah (1-ε (σ)), obtains density p-stress sigma function relation in solid filling material compacting process, that is:

$\mathrm{\&rho;}\left(\mathrm{\&sigma;}\right)=\frac{{\mathrm{\&rho;}}_0}{(1-\mathrm{\&epsiv;}\left(\mathrm{\&sigma;}\right))}=\frac{m_0}{\mathrm{Ah}(1-\mathrm{\&epsiv;}\left(\mathrm{\&sigma;}\right))}---\left(4\right);$

F, when solid filling material is filled into behind goaf, solid filling material is subject to the compacting power σ from reinforcement mechanism _t, form closely knit obturation, according to the relational expression in step e (4), obtain this obturation at compacting power σ _tunder density p _t:

${\mathrm{\&rho;}}_t=\frac{m_0}{\mathrm{Ah}(1-\mathrm{\&epsiv;}\left({\mathrm{\&sigma;}}_t\right))}---\left(5\right).$

2. a kind of solid filling according to claim 1 is mined to fill and is adopted quality than method for designing, it is characterized in that: described strain-stress relation matching requires coefficient R ²be not less than 0.95.

3. a kind of solid filling according to claim 1 is mined to fill and is adopted quality than method for designing, it is characterized in that: the compacting power σ of described reinforcement mechanism _tscope is 1.5～2.5MPa.

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