CN103590846B - The ratification method of the reasonable working resistance of a kind of working surface hydraulic support - Google Patents

Abstract

A ratification method for the reasonable working resistance of working surface hydraulic support, comprises the following steps: the reasonable working resistance of force piece appraise and decide required resistance 4 be worth p, with actual measurement and calculating; Face roof deflection Δ h _iactual measurement and calculating; Face roof control effects divides; The determination of support working resistance chosen candidate value Ri; When face roof is pressed support end resistance ri more than p, with ratio A ₁statistics; The reasonable working resistance R of force piece appraises and decides.The present invention accurately can appraise and decide mining face support working resistance, greatly improves from method system and parameter quantitative aspect the efficiency that support working resistance determines.

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, extremely widely using of comprehensive mining hydraulic bracket becomes inevitable, and the comprehensive mining hydraulic bracket that current China newly comes into operation reaches 5 ~ 60,000/year.To the key problem being selected to the safe and efficient production of restriction fully-mechanized mining working of support pattern and parameter before exploitation, wherein working resistance of support (supporting intensity) is the important parameter of most fundamental sum.Affect by ore deposit pressure, 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 ensure 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 with the efficiency and cost withdrawing work etc. to support installing.

The determination of the reasonable working resistance of working surface hydraulic support divides 2 kinds of situations.One is the theoretical calculation method not having the reference of conditions of similarity experience with mining, and two is have conditions of similarity mining Practice experience, namely has the analogy method based on mining face fully mechanized mining supporter working resistance and the effectiveness of roof control measured value.Analogy method is considered to the method closest to actual requirement, determines to have in practice for a long time to apply extremely widely 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 to the most prerequisite of analogy method application.

At present main by pressing to production scene support result of use and ore deposit the fuzzy evaluation manifested to appraising and deciding of mining face support working resistance, in such as recovery process, larger etc. to be considered to working resistance of support less than normal for extensive pressure rack and the amount of crushing, 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 proposes according to support actual measurement working resistance statistical indicator determination support working resistance, but the method lacks Roof Control effect standard; Other research bases are mining face roof condition and actual measurement strata pressure laws, calculate roof pressure according to top board structure 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 the professional knowledge compared with system, lacks face roof control effects standard too.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 be in the experience stage, do not have a kind of reasonably working resistance of support to appraise and decide and method to set up.

Summary of the invention

For solving the 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 appraises and decides the calculating of required Resistance Value

(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 when pressing

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

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

(3) support average inclined resistance when pressing

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

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

In formula: r _iduring-roof weighting, each coal cutting circulation inner support circulates last resistance, kN; Coal cutting circulation sum when n-presses; -support average resistance when pressing, kN; Then,

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

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

(4) resistance in support average when pressing

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

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

P, with be referred to as working resistance of support 4 to be worth;

Wherein, coefficient of the mean deviation B can also be used ₁, B ₂the inclined resistance of adjustment average with resistance in average b under normal circumstances ₁=1, B ₁=2, if now or the corresponding amount of crushing is comparatively large, can not meet control top levels necessitate, or when work plane is pressed support end resistance more than p, with ratio A1 comparatively large, should B be adjusted ₁, B ₂, now wherein B ₁=1.1 ~ 1.9, B ₂>=2.1;

2) face roof control effects divides

3 amount of crushing increased successively threshold value Δs are set ₁, Δ ₂and Δ ₃(threshold value is determined according to the requirement of mine to face roof control effects), face roof control effects is divided into 4 ranks, 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) old top free settling is to face roof largest amount of subsidence Δ h during 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 roof periodic water component, 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

$r=p_0+k\frac{{\mathrm{\Δh}}_A}{{\mathrm{\Δh}}_i}$

In formula: working resistance of support when r-work plane is pressed, kN; p ₀-face roof surveys working resistance of support, kN before pressing; K-top board position state constant, kN; Δ h _a-old top free settling is to face roof largest amount of subsidence during 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, obtain respective face roof control effects rank;

4) support working resistance chosen candidate value R _idetermination

According to Δ h _icorresponding face roof control effects rank, choosing face roof control effects rank is that one or more values in working resistance of support 4 value 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 _imore than 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 is worth, and automatically can be recorded obtain with statistical analysis by ore pressure monitor instrument, and the top board position state equation constant of support-Relationship Between Face Supports And Surrounding can by surveying with Δ h ₂conveniently calculate accurately, and calculate the amount of crushing corresponding to all the other 3 working resistance of support values accordingly.Support resistance 4 is worth and the authenticity of the amount of crushing and accuracy ensure that the reasonable working resistance R of force piece that " 41 rule " is appraised and decided can reflect control top real achievement and requirement.Therefore " 41 rule " underlying parameter (working resistance of support 4 is worth and the amount of crushing) is intuitively accurate.

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

3) when having added up work plane to press, support circulates last resistance r _ithe ratio A that super working resistance of support 4 is worth ₁, select threshold eventually as the second appraised and decided of working resistance of support reasonable value.

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

5) the reasonable working resistance of force piece being 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 accurately can appraise and decide mining face support working resistance, greatly improves normalization and the science of the Analogy that support working resistance is determined from method system and parameter quantitative aspect.

Accompanying drawing explanation

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

Fig. 2 is the spirogram that crushes that case 22305 face roof control effects is corresponding.

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 effects is the first order; The solid-line rectangle region 2 correspondence amount of crushing Δ ₁~ Δ ₂, characterizing face roof control effects is the second level; The solid-line rectangle region 3 correspondence amount of crushing Δ ₂~ Δ ₃, characterizing face roof control effects is the third level; The open solid line region 4 correspondence amount of crushing>=Δ ₃, characterizing face roof control effects 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 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 to face roof largest amount of subsidence during lowest order state, and c-work plane surveys roof periodic water component.

Detailed description of the invention

By reference to the accompanying drawings for certain ore deposit 22305 fully-mechanized mining working, describe concrete steps of the invention process in detail:

Normally advance in 177m process at 22305 fully-mechanized mining workings, work plane experience 9 ~ 10 roof periodic are pressed.Totally 5 hydraulic supports are as working resistance monitoring target to choose 30#, 60#, 80#, 100#, 120# in work plane, and according to ore pressure monitor 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 appraises and decides the calculating of required Resistance Value

(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 when (2) 9 ~ 10 roof periodic are pressed

$\stackrel{\‾}{p}=\frac{\underset{i=1}{\overset{n}{\mathrm{\Σ}}}{r}_i}{n}=16727\mathrm{kN}$

Support average inclined resistance when (3) 9 ~ 10 roof periodic are pressed

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

${\mathrm{\σ}}_n=\sqrt{\frac{\underset{i=1}{\overset{n}{\mathrm{\Σ}}}{(r_i-\stackrel{\‾}{p})}^2}{n}}=992\mathrm{kN}$

Then support average inclined resistance when roof periodic is pressed is calculated

${\stackrel{\‾}{p}}_1=\stackrel{\‾}{p}+{\mathrm{\σ}}_n=17719\mathrm{kN}$

Resistance in support average when (4) 9 ~ 10 roof periodic are pressed

${\stackrel{\‾}{p}}_2=\stackrel{\‾}{p}+{2\mathrm{\σ}}_n=18711\mathrm{kN}$

2) 22305 face roof control effects are divided

With face roof deflection Δ h _ias the main discriminant criterion of work plane the effectiveness of roof control, get 3 amount of crushing threshold values (to determine according to the requirement of this ore deposit to mine working face Roof Control effect, in the present embodiment, threshold value is respectively 100mm, 250mm, 400mm) face roof control effects is 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

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

Working resistance of support 4 is worth the corresponding amount of crushing and 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 fore-stock working resistance p is pressed in work plane actual measurement 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, ${\stackrel{\‾}{p}}_1=17719\mathrm{kN},{\stackrel{\‾}{p}}_2=18711\mathrm{kN}$ Substitute into formula $r=p_0+k\frac{{\mathrm{\Δh}}_A}{{\mathrm{\Δh}}_i},$ Calculate the corresponding amount of crushing Δ h ₁=242mm, Δ h ₃=253mm, Δ h ₄=218mm; According to the division of face roof control effects, working resistance of support 4 is worth corresponding face roof control effects rank 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 _idetermination

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

5) support end resistance r during the roof weighting of statistical work face _iexceed the ratio A of working resistance 4 value ₁

The number that when statistical work face is pressed, the last resistance of support exceedes working resistance of support 4 value accounts for work plane to press the ratio A of total number (n) of time-continuing process medium-height trestle end resistance ₁, in table 2.

Table 222305 fully-mechanized mining working 5 support A1 statistical forms

6) the reasonable working resistance R of force piece is appraised and decided

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 under 2 kinds of resistance conditions, face roof control effects 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; be only patent of the present invention preferably detailed description of the invention; but the protection domain of patent of the present invention is not limited thereto; anyly be familiar with those skilled in the art in the technical scope of patent diselosesll of the present invention; the change that can expect easily or replacement, within the protection domain that all should be encompassed in 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 appraises and decides the calculating of required Resistance Value

(1) support yield load p

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

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 when pressing

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

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

(3) support average inclined resistance when pressing

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

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

In formula: r _iduring-roof weighting, each coal cutting circulation inner support circulates last resistance, kN; Coal cutting circulation sum when n-presses; -support average resistance when pressing, kN; Then,

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

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

(4) resistance in support average when pressing

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

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

P, with be referred to as working resistance of support 4 to be worth;

Wherein, coefficient of the mean deviation B is also comprised ₁, B ₂be used for adjusting the inclined resistance of average with resistance in average make ${\stackrel{\‾}{p}}_1=\stackrel{\‾}{p}+B_1{\mathrm{\σ}}_n,{\stackrel{\‾}{p}}_2=\stackrel{\‾}{p}+B_2{\mathrm{\σ}}_n;$

B under normal circumstances ₁=1, B ₂=2; If or when corresponding face roof deflection or work plane are pressed support end resistance more than p, with ratio A ₁comparatively ambassador its can not meet control top levels necessitate, should B be adjusted ₁, B ₂, wherein B ₁=1.1 ~ 1.9, B ₂>=2.1;

2) face roof control effects divides

3 face roof deflection threshold value Δs increased successively are set ₁, Δ ₂and Δ ₃, described threshold value is determined according to the requirement of mine to face roof control effects, and face roof control effects is divided into 4 ranks, 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) old top free settling is to face roof largest amount of subsidence Δ h during 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 roof periodic water component, 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

$r=p_0+k\frac{{\mathrm{\Δh}}_A}{{\mathrm{\Δh}}_i}$

In formula: working resistance of support when r-work plane is pressed, kN; p ₀-face roof surveys working resistance of support, kN before pressing; K-top board position state constant, kN; Δ h _a-old top free settling is to face roof largest amount of subsidence during 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 face roof deflection threshold value Δ ₁, Δ ₂, Δ ₃compare, obtain respective face roof control effects rank;

4) support working resistance chosen candidate value R _idetermination

According to Δ h _icorresponding face roof control effects rank, choosing face roof control effects rank is that one or more values in working resistance of support 4 value 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 _imore than p, with ratio A ₁statistics

Support end resistance r when statistical work face is pressed respectively _isuper p, with ratio A ₁;

Wherein, A ₁the number exceeding working resistance of support 4 value for support end resistance when work plane is pressed accounts for work plane to press the ratio of total number of time-continuing process medium-height trestle end resistance;

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.