CN103590846A - Method of verifying reasonable working resistance of working face hydraulic support - Google Patents

Abstract

A method of verifying reasonable working resistance of a working face hydraulic support includes the steps of measuring and calculating four resistance values p required by verification of working face support reasonable working resistance, and a sum of the values; measuring and calculating working face roof settlement delta hi; dividing working face roof control effects; determining a support reasonable working resistance alternative Ri; counting a ratio A1 of support end resistance ri during working face roof weighting, exceeding the values p and the sum; verifying working face support reasonable working resistance R. The method has the advantages that finished working face support reasonable working resistance and the efficiency of determining the support reasonable working resistance is greatly improved in terms of methodic systemization and parameter quantification.

Description

The ratification method of the reasonable working resistance of a kind of working surface hydraulic support

Technical field

The invention belongs to Roof Control field, coal mining coal wall, especially relate to the ratification method of the reasonable working resistance of working surface hydraulic support.

Background technology

Along with coal face machinery melts the universal of mining method, being extremely widely used of comprehensive mining hydraulic bracket becomes certainty, and the comprehensive mining hydraulic bracket that China newly comes into operation at present reaches 5～60,000/year.The key problem that is selected to restriction fully-mechanized mining working safe and efficient production to support pattern and parameter before exploitation, wherein working resistance of support (supporting intensity) is the important parameter of fundamental sum.Pressed by ore deposit affects, and working resistance of support is on the low side, and the easy large area of support is damaged and is even crushed to death, and can not guarantee safe and efficient coal mining; Working resistance of support is higher, and the weight and volume of support can increase, and causes waste, and manufacture difficulty is strengthened, and brings serious adverse effect to efficiency and the cost that work etc. was installed and withdrawn to support.

Determining of the reasonable working resistance of working surface hydraulic support divides 2 kinds of situations.The one, there is no the theoretical calculation method of conditions of similarity experience with mining reference, the 2nd, there is conditions of similarity mining Practice experience, there are mining face fully mechanized mining supporter working resistance and the effectiveness of roof control measured value as basic analogy method.Analogy method is considered to approach most the method for actual requirement, determines in practice have extremely widely and apply for a long time in countries in the world especially China's working resistance of support.Correspondingly, the rational judge of the working resistance of support of mining face as primary object is become the most prerequisite requirement of analogy method application.

At present main by production scene support result of use and ore deposit are pressed to the fuzzy evaluation manifesting to appraising and deciding of mining face support working resistance, such as extensive pressure rack and the amount of crushing in recovery process are larger etc., be considered to working resistance of support less than normal, the less working resistance of support that is considered to of face roof deflection meets control top requirement etc., lacks the judgment criteria of working resistance of support reasonable value in the method utilization process; Correlative study has proposed to determine support working resistance according to support actual measurement working resistance statistical indicator, but the method lacks Roof Control effect standard; Other researchs are according to rule is pressed in mining face roof condition and actual measurement ore deposit, according to top board structure, calculate roof pressure and contrast with support yield load, qualitative evaluation working resistance of support reasonability, the method is difficult to popularize owing to needing researcher to have compared with the professional knowledge of system, lacks too face roof and controls effect standard.To sum up, also do not propose both at home and abroad to evaluate the rational systems approach of mining face working resistance of support, make the application of analogy method in the experience stage, do not have a kind of rational working resistance of support to appraise and decide and method to set up.

Summary of the invention

For addressing the above problem, the present invention proposes the ratification method of the reasonable working resistance of a kind of working surface hydraulic support, comprises the following steps:

1) the reasonable working resistance of force piece is appraised and decided required Resistance Value calculating

(1) support yield load p

$p=\underset{i=1}{\overset{N}{\mathrm{\Σ}}}\mathrm{\π}{\left(\frac{{\mathrm{\φ}}_i}{2}\right)}^2{P}_i$

In formula: φ _i-bracket upright post internal diameter, mm; N-column radical; P _i-column opening pressure of safety valve, MPa;

(2) support average resistance while pressing

$\stackrel{\‾}{p}=\frac{\underset{i=1}{\overset{n}{\mathrm{\Σ}}}{r}_i}{n}$

In formula: r _ieach coal cutting circulation inner support last resistance that circulates during-roof weighting, kN; Coal cutting circulation sum when n-presses;

(3) the inclined to one side resistance of support average while pressing

First, the support last resistance meansquaredeviationσ that circulates during evaluation work face roof weighting _n

${\mathrm{\σ}}_n=\sqrt{\frac{\underset{i=1}{\overset{n}{\mathrm{\Σ}}}{(r_i-\stackrel{\‾}{p})}^2}{n}}$

In formula: r _ieach coal cutting circulation inner support last resistance that circulates during-roof weighting, kN; Coal cutting circulation sum when n-presses;

-support average resistance while pressing, kN; Then,

${\stackrel{\‾}{p}}_1=\stackrel{\‾}{p}+{\mathrm{\σ}}_n$

In formula,

-support average resistance while pressing, kN; σ _nthe support last resistance mean square deviation that circulates when-face roof is pressed;

(4) resistance in support average while pressing

${\stackrel{\‾}{p}}_2=\stackrel{\‾}{p}+{2\mathrm{\σ}}_n$

In formula:

-support average resistance while pressing, kN; σ _nthe support last resistance mean square deviation that circulates when-face roof is pressed;

P,

with

general designation working resistance of support 4 values;

Wherein, can also use coefficient of the mean deviation B ₁, B ₂adjust the inclined to one side resistance of average with resistance in average

b under normal circumstances ₁=1, B ₁=2, if now

or

the corresponding amount of crushing is larger, can not meet the top not requirement of control, or work plane while pressing support end resistance surpass p,

with

ratio A1 larger, should adjust B ₁, B ₂, now

b wherein ₁=1.1～1.9, B ₂>=2.1;

2) face roof is controlled effect division

3 amount of crushing threshold value Δs that increase are successively set ₁, Δ ₂and Δ ₃(threshold value is determined the requirement of face roof control effect according to mine), controls effect by face roof and is divided into 4 ranks, and face roof deflection is less than Δ ₁for the first order, face roof deflection is in Δ ₁with Δ ₂between be the second level, face roof deflection is in Δ ₂with Δ ₃between be the third level, face roof deflection is greater than Δ ₃for the fourth stage;

3) face roof deflection Δ h _icalculate

(1) face roof largest amount of subsidence Δ h when the free settling of old top is to lowest order state _a

${\mathrm{\Δh}}_A=\frac{h-M_z(K_A-1)}{c}\·L_K$

In formula: h-work plane mining height or extraction coal seam thickness, m; M _z-immediate roof thickness, m; C-work plane actual measurement top board periodic weighting step pitch, m; K _athe broken swollen coefficient of-immediate roof; L _kthe maximum distance of face roof under control of-work plane, m;

(2) face roof deflection Δ h _i

$r={\mathrm{<figure-callout\; id="0"\; label="p"\; filenames="HDA0000402936220000012.png"\; state="\{\{state\}\}">p</figure-callout>}}_0+k\frac{{\mathrm{\&Delta;h}}_A}{{\mathrm{\&Delta;h}}_i}$

In formula: working resistance of support when r-work plane is pressed, kN; p ₀-face roof is pressed front actual measurement working resistance of support, kN; K-top board position state constant, kN; Δ h _a-old top free settling is face roof largest amount of subsidence during to lowest order state; Δ h _i-face roof deflection, mm;

time, actual measurement obtains Δ h _i=Δ h ₂, will

Δ h ₂substitution obtains k;

During r=p, calculate Δ h _i=Δ h ₁;

time, calculate Δ h _i=Δ h ₃;

time, calculate Δ h _i=Δ h ₄;

By Δ h ₁, Δ h ₂, Δ h ₃, Δ h ₄respectively with the amount of crushing threshold value Δ ₁, Δ ₂, Δ ₃compare, the face roof obtaining is separately controlled effect level;

4) support working resistance chosen candidate value R _idetermine

According to Δ h _icorresponding face roof is controlled effect level, and choosing face roof, to control effect level be that one or more values in working resistance of support 4 values corresponding to the first order or the second level are as support working resistance chosen candidate value R _i;

5) support end resistance r when face roof is pressed _isurpass p,

with ratio A ₁statistics

Support end resistance r when statistical work face is pressed respectively _isuper p,

with ratio A ₁;

6) the reasonable working resistance R of force piece appraises and decides result

From chosen candidate value R _iin select A ₁less Ri minimum value is as support working resistance value R.

The present invention compared with prior art has the following advantages:

1) working resistance of support 4 value, can by ore deposit press monitoring instrument automatically record and statistical analysis obtain, the top board position state equation constant of support-Relationship Between Face Supports And Surrounding can be by surveying

with Δ h ₂conveniently calculate accurately, and calculate accordingly all the other 3 amounts of crushing corresponding to working resistance of support value.The authenticity of support resistance 4 values and the amount of crushing and accuracy have guaranteed that the reasonable working resistance R of force piece that " 41 rule " appraised and decided can reflect control top real achievement and requirement.Therefore " 41 rule " underlying parameter (working resistance of support 4 value and the amounts of crushing) is intuitively accurate.

2) according to the amount of crushing Δ h _iroof Control effect has been carried out clearly dividing, made support working resistance chosen candidate value R _idefined basic discrimination standard, for appraising and deciding of support working resistance provides first mandatory basic threshold.

3) the support last resistance r that circulates while having added up work plane and press _ithe ratio A of super working resistance of support 4 values ₁, as the second of appraising and deciding of working resistance of support reasonable value, select eventually threshold.

4) target of dealing with problems is clear; Concept and definition clear-cut; Basic parameter is from the horse's mouth, uses flow process terse, and technical system is complete.

5) the reasonable working resistance of force piece that is applicable to known actual measurement working resistance of support and the amount of crushing is appraised and decided.

In sum, the method described in the application can accurately be appraised and decided mining face support working resistance, has greatly promoted standardization and the science of the definite Analogy of support working resistance from method systematization and parameter quantitative aspect.

Accompanying drawing explanation

Fig. 1 is the spirogram that crushes corresponding to Roof Control effect.

Fig. 2 is that case 22305 face roofs are controlled the spirogram that crushes corresponding to effect.

Fig. 3 is stope Roof Control position state schematic diagram.

Δ h in Fig. 1-2 _i-face roof deflection; The solid-line rectangle region 1 correspondence amount of crushing 0～Δ ₁, characterizing face roof control effect is the first order; The solid-line rectangle region 2 correspondence amount of crushing Δs ₁～Δ ₂, characterizing face roof control effect is the second level; The solid-line rectangle region 3 correspondence amount of crushing Δs ₂～Δ ₃, characterizing face roof control effect is the third level; The open solid line region 4 correspondence amount of crushing>=Δs ₃, characterizing face roof control effect is the fourth stage;

M in Fig. 3 _ethe old top thickness degree of-work plane, M _z-work plane immediate roof thickness, h-work plane mining height or extraction coal are thick, L _kthe maximum distance of face roof under control of-work plane, Δ h _i-face roof deflection, Δ h _a-old top free settling is face roof largest amount of subsidence during to lowest order state, c-work plane actual measurement top board periodic weighting step pitch.

The specific embodiment

Take by reference to the accompanying drawings certain ore deposit 22305 fully-mechanized mining working is example, describes concrete steps of the invention process in detail:

At 22305 fully-mechanized mining workings, normally advance in 177m process 9～10 top board periodic weightings of work plane experience.Totally 5 hydraulic supports are as working resistance monitoring target to choose work plane interior 30#, 60#, 80#, 100#, 120#, and according to ore deposit pressure monitoring parameter, employing " 41 rule " is appraised and decided and adopted 22305 fully-mechanized mining working support working resistances.

1) the reasonable working resistance of force piece is appraised and decided required Resistance Value calculating

(1) support yield load p

22305 fully-mechanized mining working support used is two-pier shielding cribbing, yield load p=18000kN.Bracket upright post internal diameter φ _i=500mm, column opening pressure of safety valve P _i=45.86MPa.

Support end resistance average during (2) 9～10 top board periodic weightings

$\stackrel{\&OverBar;}{p}=\frac{\underset{i=1}{\overset{n}{\mathrm{\&Sigma;}}}{r}_i}{n}=16727\mathrm{kN}$

The inclined to one side resistance of support average during (3) 9～10 top board periodic weightings

First the support last resistance meansquaredeviationσ that circulates during evaluation work face roof weighting _n:

${\mathrm{\&sigma;}}_n=\sqrt{\frac{\underset{i=1}{\overset{n}{\mathrm{\&Sigma;}}}{(r_i-\stackrel{\&OverBar;}{p})}^2}{n}}=992\mathrm{kN}$

The inclined to one side resistance of support average while then calculating top board periodic weighting

${\stackrel{\&OverBar;}{p}}_1=\stackrel{\&OverBar;}{p}+{\mathrm{\&sigma;}}_n=17719\mathrm{kN}$

Resistance in support average during (4) 9～10 top board periodic weightings

${\stackrel{\&OverBar;}{p}}_2=\stackrel{\&OverBar;}{p}+{2\mathrm{\&sigma;}}_n=18711\mathrm{kN}$

2) divide 22305 face roofs and control effect

With face roof deflection Δ h _imain discriminant criterion as work plane the effectiveness of roof control, getting 3 amount of crushing threshold values (determines the requirement of mine working face Roof Control effect according to this ore deposit, in the present embodiment, threshold value is respectively 100mm, 250mm, 400mm) face roof is controlled to effect be divided into 4 grades, be respectively the first order, the second level, the third level and the fourth stage, in Table 1, the corresponding amount of crushing as shown in Figure 2.

Table 122305 roof of coal face control theory standard

3) face roof deflection Δ h _icalculate

Face roof deflection can limit " support-country rock " relational expression under deformation operation state according to support and quantitatively calculate, and stope Roof Control position state as shown in Figure 3.

The amount of crushing corresponding to working resistance of support 4 values is respectively: p-Δ h ₁,

with

According to mining face top board structure calculation of characteristic parameters face roof largest amount of subsidence

(wherein h=6.8m, M _z=15.52m, K _a=1.3, c=16.8m, L _k=5.69m), force piece average resistance

work plane surveys to press fore-stock working resistance p ₀the amount of the crushing Δ h of=11424kN, actual measurement ₂=300mm, according to support-Relationship Between Face Supports And Surrounding formula

obtain the top board position state constant k=2191kN under the specific surrounding rock structure situation of work plane.By p=18000kN, ${\stackrel{\&OverBar;}{p}}_1=17719\mathrm{kN},{\stackrel{\&OverBar;}{p}}_2=18711\mathrm{kN}$ Substitution formula $r={\mathrm{<figure-callout\; id="0"\; label="p"\; filenames="HDA0000402936220000012.png"\; state="\{\{state\}\}">p</figure-callout>}}_0+k\frac{{\mathrm{\&Delta;h}}_A}{{\mathrm{\&Delta;h}}_i},$ Calculate the corresponding amount of crushing Δ h ₁=242mm, Δ h ₃=253mm, Δ h ₄=218mm; According to face roof, control the division of effect, face roof corresponding to working resistance of support 4 values controlled effect level and is respectively: Δ h ₁-the second level, Δ h ₂-the third level, Δ h ₃-the third level, Δ h ₄-the second level.

4) support working resistance chosen candidate value R _idetermine

According to result of calculation, get working resistance of support value that corresponding Roof Control effect level is the first order or the second level as support working resistance chosen candidate value, i.e. R ₁=p,

5) support end resistance r during statistical work face roof weighting _ithe ratio A that surpasses working resistance 4 values ₁

When statistical work face is pressed, support end resistance accounts for over the number of working resistance of support 4 values the ratio A that work plane is pressed total number (n) of time-continuing process medium-height trestle end resistance ₁, in Table 2.

5 support A1 statistical forms of table 222305 fully-mechanized mining working

6) appraise and decide the reasonable working resistance R of force piece

As shown in Table 3, in 2 chosen candidate values, R ₁a during=p ₁=2.1～13.3/7.4%;

time A ₁=0～1.8/0.4%, A ₁all less.Because face roof control effect under 2 kinds of resistance conditions is the second level, meet work plane control top requirement, we get R _iminimum value is support working resistance, i.e. R=p=18000kN.

The above; it is only the preferably specific embodiment of patent of the present invention; but the protection domain of patent of the present invention is not limited to this; anyly be familiar with in technical scope that those skilled in the art disclose in patent of the present invention; the variation that can expect easily or replacement, within all should being encompassed in the protection domain of patent of the present invention.

Claims (1)

1. a ratification method for the reasonable working resistance of working surface hydraulic support, is characterized in that comprising the following steps:

1) the reasonable working resistance of force piece is appraised and decided required Resistance Value calculating

(1) support yield load p

$p=\underset{i=1}{\overset{N}{\mathrm{\&Sigma;}}}\mathrm{\&pi;}{\left(\frac{{\mathrm{\&phi;}}_i}{2}\right)}^2{P}_i$

In formula: φ _i-bracket upright post internal diameter, mm; N-column radical; P _i-column opening pressure of safety valve, MPa;

(2) support average resistance while pressing

$\stackrel{\&OverBar;}{p}=\frac{\underset{i=1}{\overset{n}{\mathrm{\&Sigma;}}}{r}_i}{n}$

In formula: r _ieach coal cutting circulation inner support last resistance that circulates during-roof weighting, kN; Coal cutting circulation sum when n-presses;

(3) the inclined to one side resistance of support average while pressing

First, the support last resistance meansquaredeviationσ that circulates during evaluation work face roof weighting _n

${\mathrm{\&sigma;}}_n=\sqrt{\frac{\underset{i=1}{\overset{n}{\mathrm{\&Sigma;}}}{(r_i-\stackrel{\&OverBar;}{p})}^2}{n}}$

In formula: r _ieach coal cutting circulation inner support last resistance that circulates during-roof weighting, kN; Coal cutting circulation sum when n-presses;

-support average resistance while pressing, kN; Then,

${\stackrel{\&OverBar;}{p}}_1=\stackrel{\&OverBar;}{p}+{\mathrm{\&sigma;}}_n$

In formula:

-support average resistance while pressing, kN; σ _nthe support last resistance mean square deviation that circulates when-face roof is pressed;

(4) resistance in support average while pressing

${\stackrel{\&OverBar;}{p}}_2=\stackrel{\&OverBar;}{p}+{2\mathrm{\&sigma;}}_n$

In formula: -support average resistance while pressing, kN; σ _nthe support last resistance mean square deviation that circulates when-face roof is pressed;

P,

with general designation working resistance of support 4 values;

Wherein, also comprise coefficient of the mean deviation B ₁, B ₂be used for adjusting the inclined to one side resistance of average

with resistance in average

make ${\stackrel{\&OverBar;}{p}}_1=\stackrel{\&OverBar;}{p}+B_1{\mathrm{\&sigma;}}_n,{\stackrel{\&OverBar;}{p}}_2=\stackrel{\&OverBar;}{p}+B_2{\mathrm{\&sigma;}}_n;$

B under normal circumstances ₁=1, B ₁=2; If

or when the corresponding amount of crushing or work plane are pressed support end resistance surpass p,

with

ratio A ₁compared with ambassador, it can not meet the top not requirement of control, should adjust B ₁, B ₂, B wherein ₁=1.1～1.9, B ₂>=2.1;

2) face roof is controlled effect division

3 amount of crushing threshold value Δs that increase are successively set ₁, Δ ₂and Δ ₃, the requirement that described threshold value is controlled effect according to mine to face roof is definite, face roof is controlled to effect and be divided into 4 ranks, and face roof deflection is less than Δ ₁for the first order, face roof deflection is in Δ ₁with Δ ₂between be the second level, face roof deflection is in Δ ₂with Δ ₃between be the third level, face roof deflection is greater than Δ ₃for the fourth stage;

3) face roof deflection Δ h _icalculate

(1) face roof largest amount of subsidence Δ h when the free settling of old top is to lowest order state _a

${\mathrm{\&Delta;h}}_A=\frac{h-M_z(K_A-1)}{c}\&CenterDot;L_K$

In formula: h-work plane mining height or extraction coal seam thickness, m; M _z-immediate roof thickness, m; C-work plane actual measurement top board periodic weighting step pitch, m; K _athe broken swollen coefficient of-immediate roof; L _kthe maximum distance of face roof under control of-work plane, m;

(2) face roof deflection Δ h _i

$r=p_0+k\frac{{\mathrm{\&Delta;h}}_A}{{\mathrm{\&Delta;h}}_i}$

In formula: working resistance of support when r-work plane is pressed, kN; p ₀-face roof is pressed front actual measurement working resistance of support, kN; K-top board position state constant, kN; Δ h _a-old top free settling is face roof largest amount of subsidence during to lowest order state; Δ h _i-face roof deflection, mm;

time, actual measurement obtains Δ h _i=Δ h ₂, will

Δ h ₂substitution obtains k;

During r=p, calculate Δ h _i=Δ h ₁;

time, calculate Δ h _i=Δ h ₃;

time, calculate Δ h _i=Δ h ₄;

By Δ h ₁, Δ h ₂, Δ h ₃, Δ h ₄respectively with the amount of crushing threshold value Δ ₁, Δ ₂, Δ ₃compare, the face roof obtaining is separately controlled effect level;

4) support working resistance chosen candidate value R _idetermine

According to Δ h _icorresponding face roof is controlled effect level, and choosing face roof, to control effect level be that one or more values in working resistance of support 4 values corresponding to the first order or the second level are as support working resistance chosen candidate value R _i;

5) support end resistance r when face roof is pressed _isurpass p,

with

ratio A ₁statistics

Support end resistance r when statistical work face is pressed respectively _isuper p,

with

ratio A ₁;

6) the reasonable working resistance R of force piece appraises and decides result

From chosen candidate value R _iin select A ₁less R _iminimum value is as support working resistance value R.

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