CN103510984B - 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, while utilizing underground goaf to process the solid waste such as gangue, flyash, liberation " three times " pressure coal, both colliery solid waste ground release, liberation mine hoisting ability had been reduced, mining subsidence disaster can be alleviated again, improve resource recovery, become the key technology realizing colliery lasting exploit.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 be transported to goaf through haulage devices such as down-hole ribbon conveyer, elevating conveyors, realize the sold stowing in goaf by crucial stowage units such as porous bottom-dump conveyer, filling coal mining hydraulic support, reinforcement mechanisms.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 effects of obturation to strata movement.If the mass ratio of solid filling material and coal produced quantity can be grasped in time, not only contribute to improving filling effect, and can control to provide theoretical foundation for whole filling operation face Full Ratio.Therefore, study a kind of solid filling to mine to fill and adopt quality and become than method for designing and implement research means that solid filling coal-mining technique could not lack and research method.

Summary of the invention

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

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 utilizing coal extraction space equal with the solid filling material spatial volume be filled with, design fill adopt mass ratio equivalence design the density of solid filling material and the density ratio of raw coal, its design is as follows:

Fill and adopt mass ratio e for tamping power σ _tsolid filling material density ρ under effect _twith the density p of raw coal _cratio, that is:

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

In formula, the density p of raw coal _cmeasured by field sampling; Solid filling material is at compacting power σ _tdensity p under effect _tcalculated by laboratory test and data fitting and obtain, 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, the stress σ in record loading procedure and strain stress;

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

ε＝ε(σ) (3)；

E, according to mass conservation law ρ in compacting process ₀ah=ρ (σ) Ah (1-ε (σ)), obtains solid filling material compacting process Midst density ρ-stress sigma function relation, 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, after solid filling material is filled into goaf, solid filling material is subject to the compacting power σ from reinforcement mechanism _t, form closely knit obturation, according to the relational expression (4) in step e, namely 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 analyzing charging quantity and coal mining output proportionate relationship.The present invention carries out field sampling to the mine carrying out solid filling coal mining, solid filling material is mixed with by sampling the spoil obtained, compactingproperties test is carried out to solid filling material, solid filling coal mining stowing ratio can be determined more exactly, namely every extraction 1t coal needs the filler quality of filling, thus 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 and filled and adopt quality than method for designing schematic diagram;

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

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

Detailed description of the invention

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, utilizes the principle that coal extraction space is equal with the solid filling material spatial volume be filled with, and design is filled and 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 to mine and fill and adopt quality than method for designing schematic diagram, show in figure according to solid filling material compacting process Midst density-stress function relation, obtain axial stress σ _tcompacted density ρ corresponding to (its value is determined by the filling key equipment of concrete mine) _t, with the density p of raw coal _ccompare, the solid filling obtained under certain Full Ratio condition is mined to fill and is adopted mass ratio.Fill and adopt mass ratio e by the solid filling material density ρ under Full Ratio condition _twith the density p of raw coal _cratio:

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

In formula, the density p of raw coal _cmeasured by field sampling; The density p of solid filling material under Full Ratio condition _tcalculated by laboratory test and data fitting and obtain, 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, the stress σ in record loading procedure and strain stress;

D, drafting ε-σ curve, by coefficient R ²strain stress-stress sigma function relation that matching obtains in solid filling material compacting process is carried out to curve, 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 solid filling material compacting process Midst density ρ-stress sigma function relation, 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, after solid filling material is filled into goaf, solid filling material is subject to the compacting power σ from reinforcement mechanism _t, become the obturation with Full Ratio, according to the relational expression (4) in step e, namely 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.

Embodiment 1, to carry out design for certain ore deposit as follows:

Fill and adopt mass ratio e for tamping power σ _tsolid filling material density ρ under effect _twith the density p of 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 _cρ is determined as by field sampling _c=1425kg/m ³; Solid filling material is at compacting power σ _tdensity p under effect _t=1947kg/m ³calculated by laboratory test and data fitting and obtain, 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:

${\mathrm{\ρ}}_0=\frac{m_0}{\mathrm{Ah}}=1362\mathrm{kg}/m^3---\left(2\right)$

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

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 strain stress-stress sigma function relation that matching obtains 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 solid filling material compacting process Midst density ρ-stress sigma function relation, that is:

$\mathrm{\ρ}\left(\mathrm{\σ}\right)=\frac{{\mathrm{\ρ}}_0}{(1-\mathrm{\ϵ}\left(\mathrm{\σ}\right))}=\frac{1362}{(1-0.04332\ln (512.3\mathrm{\σ}+0.9988))}---\left(4\right);$

F, after solid filling material is filled into goaf, solid filling material is subject to the compacting power from reinforcement mechanism, forms closely knit obturation, the compacting power σ of Yang Zhuan 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:

${\mathrm{\ρ}}_2=\frac{m_0}{\mathrm{Ah}(1-\mathrm{\ϵ}\left(2\right))}=1947\mathrm{kg}/m^3---\left(5\right).$

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 utilizing coal extraction space equal with the solid filling material spatial volume be filled with, design fill adopt mass ratio be equivalent to design be filled with the density of solid filling material and the density ratio of raw coal, its design is as follows:

Fill and adopt mass ratio e for tamping power σ _tsolid filling material density ρ under effect _twith the density p of raw coal _cratio, that is:

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

In formula, the density p of raw coal _cmeasured by field sampling; Solid filling material is at compacting power σ _tdensity p under effect _tcalculated by laboratory test and data fitting and obtain, 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, the stress σ in record loading procedure and strain stress;

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

ε＝ε(σ) (3)；

E, according to mass conservation law ρ in compacting process ₀ah=ρ (σ) Ah (1-ε (σ)), obtains solid filling material compacting process Midst density ρ-stress sigma function relation, 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, after solid filling material is filled into goaf, solid filling material is subject to the compacting power σ from reinforcement mechanism _t, form closely knit obturation, according to the relational expression (4) in step e, namely obtain this obturation at compacting power σ _tunder density p _t:

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

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.