CN104568646A - Underground rapid coal seam gas content measurement method - Google Patents

Abstract

The invention relates to an underground rapid coal seam gas content measurement method which comprises the following steps: drilling a hole with the diameter of 42mm and the depth of 14m in the coal tunnel drilling working face; measuring the total coal powder quantity of bore S of the section while drilling by 1m, measuring the value K1 or Delta h2 once while drilling by 2m, and selecting the maximum value of the actually measured data as the final measured value of each index of the drill hole; measuring the coal seam gas content W by virtue of a direct method while drilling by 14m; determining the association degree among S, K1 or Delta h2 and the coal seam gas content W by using a grey association method; further measuring the index which has the greatest influence on the coal seam gas content W, and simultaneously and synchronously measuring the coal seam gas content W; performing regression analysis on the measured data of the previous two steps, and determining two mathematical models; and carrying out underground rapid coal seam gas content measurement. According to the method disclosed by the invention, zone outburst prediction and zone measure effect detection can be rapidly performed; whether gas extraction on the outburst coal seam working face reaches the standard can be rapidly detected; and moreover, a low-index outburst accident is effectively avoided.

Description

A kind of coal seam gas-bearing capacity down-hole rapid assay methods

Technical field

The present invention relates to a kind of coal seam gas-bearing capacity assay method, especially a kind of down-hole rapid assay methods of coal seam gas-bearing capacity.

Background technology

Coal seam gas-bearing capacity is that mine gas reserves calculate and one of fundamental parameter of Forecast of Gas Emission, also be regional prognosis of coal and gas outburst, region outburst prevention measures validity check (" control coal and gas prominent regulation ", 2009) and one of coal mine gas drainage important indicator whether up to standard (" coal mine gas drainage basic index ", AQ 1026-2006), it is accurate, Fast Measurement is most important.

At present, coal seam gas-bearing capacity assay method has two kinds: direct method, indirect method.Direct method is carried out according to " coal seam gas-bearing capacity down-hole Direct Determination " (GB/T 23250-2009), coal seam gas-bearing capacity is made up of three parts: 1. down-hole nature coal seams gas discharging quantity-in underground site samples of coal pulled, and load coal sample tank fast, utilize desorption of mash gas speed determinator to measure; 2. gas amount-utilize graphical method to calculate is lost; 3. residual gas amount-utilize vacuum degasser experimental determination; Can find out, direct method complex process, equipment requirement is high, generally needs the time of more than 48 hours to obtain result.Indirect method is according to " Direct Determination of coal mine underground coal bed gas pressure " (AQ/T 1047-2007) on-site measurement coal-bed gas pressure, the porosity of experimental determination absorption constant (a, b value), technical analysis index (moisture, ash content, volatile matter), coal and unit weight, draw coal seam gas-bearing capacity by formulae discovery; Indirect method is consuming time longer, generally need the time of more than 20 days, and part mine does not possess the condition that down-hole directly measures coal-bed gas pressure.

In sum, said method cannot meet the demand of Modern Pit gas control, explores a kind of coal seam gas-bearing capacity down-hole rapid assay methods extremely urgent, significant.

Summary of the invention

Object of the present invention: provide a kind of coal seam gas-bearing capacity down-hole rapid assay methods, to address the deficiencies of the prior art.

Technical scheme of the present invention is: a kind of coal seam gas-bearing capacity down-hole rapid assay methods, as shown in Figure 1, comprises the following steps:

1.. in the boring of Driving Face in Coal Tunnel construction diameter 42mm, hole depth 14m.

For coal and gas outburst mine, Driving Face in Coal Tunnel outburst prediction adopts method of drilling index usually, and prediction index comprises drilling cuttings desorption of mash gas index K ₁or Δ h ₂(K ₁for the desorption of mash gas amount of coal sample every gram of coal sample in coal body disengaging exposure in an atmosphere the 1st minute, Δ h ₂for opening a certain sampling section from boring, the desorption of mash gas amount in the time period of 4th ~ 5 minutes after coal sample equalized pressure removal), coal powder quantity of bore S.In outburst prediction process, utilize same boring synchronism detection K ₁, Δ h ₂, S and coal seam gas-bearing capacity W, concrete grammar is as follows:

Nearly level, gently inclined seam workplace should forwards coal body at least construct 3, to tilt or steeply pitching seam is at least constructed the boring of 2 diameter 42mm, hole depth 14m.Boring should be arranged in soft layering as far as possible, and a boring is positioned in the middle part of digging laneway section, and is parallel to tunneling direction, and the whole hole point of other borings should be positioned at the outer 2 ~ 4m place of drift section both sides outline line, as shown in Figure 2.

2.. whole coal powder quantity of bore S that 1m measures this 1m section are often crept in boring, often creep into 2m and measure K ₁with Δ h ₂value, and choose the final measured value of maximal value as this boring indices of measured data.

3.. when borehole drilling proceeds to 14m, adopt Direct Determination coal seam gas-bearing capacity W.

4.. use gray relation analysis method to determine S, K ₁or Δ h ₂with the correlation degree of coal seam gas-bearing capacity W, choose W as female factor, X ₀, S, Δ h ₂, K ₁respectively as sub-factor X ₁, X ₂, X ₃, carry out grey correlation analysis, concrete steps are as follows:

(1) grey absolute correlation degree ε is asked _0i, order

$X_i^0=(x_i\left(1\right)-x_i\left(1\right),x_i\left(2\right)-x_i\left(1\right),x_i\left(3\right)-x_i\left(1\right),x_i\left(4\right)-x_i\left(1\right))=(x_i^0\left(1\right),x_i^0\left(2\right),x_i^0\left(3\right),x_i^0\left(4\right)),$

$\left|s_i\right|=\left|\underset{k=2}{\overset{3}{\mathrm{\Σ}}}{x}_i^0(k+\frac{1}{2}{x}_i^0\left(4\right)\right|,|s_i-s_0|=|\underset{k=2}{\overset{3}{\mathrm{\Σ}}}(x_i^0\left(k\right)-x_0^0\left(k\right))+\frac{1}{2}(x_i^0\left(4\right)-x_0^0\left(4\right))|,$

${\mathrm{\ϵ}}_{0i}=\frac{1+\left|s_0\right|+\left|s_i\right|}{1+\left|s_0\right|+\left|s_i\right|+|s_i-s_0|},(i=0~4)$

(2) grey relative relationship degree r is asked _0i, first obtain X _i( _i=0 ~ 4) initial value picture

${X^{\′}}_i=(\frac{x_i\left(1\right)}{x_i\left(1\right)},\frac{x_i\left(2\right)}{x_i\left(1\right)},\frac{x_i\left(3\right)}{x_i\left(1\right)},\frac{x_i\left(4\right)}{x\left(1\right)}),\left|{s^{\′}}_i\right|=|\underset{k=2}{\overset{3}{\mathrm{\Σ}}}{x}_i^{\′0}\left(k\right)+\frac{1}{2}{x}_i^{\′0}\left(4\right)|$

$|{s^{\′}}_i-{s^{\′}}_0|=|\underset{k=2}{\overset{3}{\mathrm{\Σ}}}(x_i^{\′0}\left(k\right)-x_0^{\′0}\left(k\right))+\frac{1}{2}(x_i^{\′0}\left(4\right)-x_0^{\′0}\left(4\right))|,$

$r_{0i}=\frac{1+\left|{s^{\′}}_0\right|+\left|{s^{\′}}_i\right|}{1+\left|{s^{\′}}_0\right|+\left|{s^{\′}}_i\right|+|{s^{\′}}_i+{s^{\′}}_0|},(i=0~4)$

(3) Synthesis Relational Grade of Grey ρ is asked _0i, get θ=0.5, ρ _0i=θ ε _0i+ (1-θ) r _0i(i=0 ~ 4)

(4) degree of association is formed inteerelated order by the arrangement of descending order, reflect that the influence power of each sub-factor to female factor weakens successively, thus optimize optimal parameter;

According to above-mentioned steps, calculate the Synthesis Relational Grade of each index, determine the index that coal seam gas-bearing capacity W is had the greatest impact.

5.. estimate the index that coal seam gas-bearing capacity W is had the greatest impact further, simultaneously Simultaneous Determination coal seam gas-bearing capacity W;

6.. regretional analysis is carried out to both determination datas above-mentioned, determines both mathematical models;

7.. realize coal seam gas-bearing capacity down-hole Fast Measurement.

Beneficial effect of the present invention: region outburst prediction and the inspection of region measure effect can be carried out fast; Can the projecting coal bed workplace of quick test (comprising crossdrift (pit shaft) exposed coal workplace, Driving Face in Coal Tunnel, coal-face) gas pumping whether up to standard; When carrying out workplace outburst prediction, can, using coal seam gas-bearing capacity as auxiliary characteristics, low index be effectively avoided to give prominence to accident; Compared with the direct method measured with coal seam gas-bearing capacity, indirect method, drilling cuttings desorption of mash gas index K ₁minute only needs 1 hours.

Accompanying drawing explanation

Fig. 1 is coal seam gas-bearing capacity down-hole rapid assay methods process flow diagram;

Fig. 2 is boring layout schematic diagram, and wherein a is nearly level, gently inclined seam Driving Face in Coal Tunnel method of drilling index prediction boring schematic diagram; B is inclination, steeply pitching seam Driving Face in Coal Tunnel method of drilling index prediction boring schematic diagram;

Fig. 3 is W and K ₁relation regretional analysis figure.

Embodiment

Below in conjunction with the concrete condition in accompanying drawing and certain colliery, the invention will be further described:

Fig. 1 is the concrete technology process flow diagram of a kind of coal seam gas-bearing capacity down-hole of the present invention rapid assay methods, the present invention includes following steps:

1.. in the boring of Driving Face in Coal Tunnel construction diameter 42mm, hole depth 14m.

For coal and gas outburst mine, Driving Face in Coal Tunnel outburst prediction adopts method of drilling index usually, and prediction index comprises drilling cuttings desorption of mash gas index K ₁or Δ h ₂(K ₁for the desorption of mash gas amount of coal sample every gram of coal sample in coal body disengaging exposure in an atmosphere the 1st minute, Δ h ₂for opening a certain sampling section from boring, the desorption of mash gas amount in the time period of 4th ~ 5 minutes after coal sample equalized pressure removal), coal powder quantity of bore S.In outburst prediction process, utilize same boring synchronism detection K ₁, Δ h ₂, S and coal seam gas-bearing capacity W, concrete grammar is as follows:

Nearly level, gently inclined seam workplace should forwards coal body at least construct 3, to tilt or steeply pitching seam is at least constructed the boring of 2 diameter 42mm, hole depth 14m.Boring should be arranged in soft layering as far as possible, and a boring is positioned in the middle part of digging laneway section, and is parallel to tunneling direction, and the whole hole point of other borings should be positioned at the outer 2 ~ 4m place of drift section both sides outline line, as shown in Figure 2.

2.. whole coal powder quantity of bore S that 1m measures this 1m section are often crept in boring, often creep into 2m and measure a K ₁or Δ h ₂value, and choose the final measured value of maximal value as this boring indices of measured data.

For certain ore deposit, under certain mine, measurement result is in table 1.It is 14m that length is always crept in each boring, in the process: whole coal powder quantity of bore S that 1m measures this 1m section are often crept in (1) boring, record 14 S altogether, choose the final measured value of maximal value as this boring S of 14 data, if 1# boring S maximal value is 3.5; (2) boring is often crept into 2m and is measured a K ₁and Δ h ₂value, records 7 K altogether ₁value, 7 Δ h ₂value, chooses the maximal value of 7 data respectively as this boring K ₁and Δ h ₂final measured value, as 1# hole K ₁maximal value is 0.48, Δ h ₂maximal value is 200.

3.. when borehole drilling proceeds to 14m, adopt Direct Determination coal seam gas-bearing capacity W.

For certain ore deposit, when borehole drilling proceeds to 14m, adopt Direct Determination coal seam gas-bearing capacity W, each boring only has 1 W measured value, if 1# boring W measured value is 5.26.

Certain ore deposit coal seam gas-bearing capacity of table 1 and outburst prediction index determining result table

4.. use gray relation analysis method to determine the correlation degree of S, K1 or Δ h2 and coal seam gas-bearing capacity W;

Choose W as female factor, X ₀, S, Δ h ₂, K ₁respectively as sub-factor X ₁, X ₂, X ₃, carry out grey correlation analysis, each factor value is in table 2.

Grey correlation analysis concrete steps are as follows:

(1) grey absolute correlation degree is asked

Order

$\begin{array}{c}{X}_i^0=(X_i\left(1\right)-X_i\left(1\right),X_i\left(2\right)-X_i\left(1\right),...,X_i\left(10\right)-X_i\left(1\right))=(X_i^0\left(1\right),X_i^0\left(2\right),...,X_i^0\left(10\right))\\ ,i=\mathrm{0,1,2,3}\end{array}$

Result of calculation is in table 3.

$\left|s_i\right|=\left|\underset{k=2}{\overset{9}{\mathrm{\Σ}}}{x}_i^0\left(k\right)+\frac{1}{2}{x}_i^0\left(10\right)\right|,i=\mathrm{0,1,2,3}$

Result of calculation is in table 4.

$|s_i-s_0|=|\underset{k=2}{\overset{9}{\mathrm{\Σ}}}(x_i^0\left(k\right)-x_0^0\left(k\right))+\frac{1}{2}(x_i^0\left(10\right)-x_0^0\left(10\right))|,i=\mathrm{0,1,2,3}$

Result of calculation is in table 5, table 6.

${\mathrm{\ϵ}}_{0i}=\frac{1+\left|s_0\right|+\left|s_i\right|}{1+\left|s_0\right|+\left|s_i\right|+|s_i-s_0|},i=\mathrm{0,1,2,3}$

Result of calculation is in table 7.

(2) grey relative relationship degree is asked

First obtain X _iinitial value as X _i'

${X_i}^{\′}=(\frac{X_i\left(1\right)}{X_i\left(1\right)},\frac{X_i\left(2\right)}{X_i\left(1\right)},...,\frac{X_i\left(10\right)}{X_i\left(1\right)}),i=\mathrm{0,1,2,3}$

Result of calculation is in table 8.

$\begin{array}{c}{X}_i^{0\′}=({X_i}^{\′}\left(1\right)-{X_i}^{\′}\left(1\right),{X_i}^{\′}\left(2\right)-{X_i}^{\′}\left(1\right),...,{X_i}^{\′}\left(10\right)-{X_i}^{\′}\left(1\right))=(X_i^{0\′}\left(1\right),X_i^{0\′}\left(2\right),...,X_i^{0\′}\left(10\right))\\ ,i=\mathrm{0,1,2,3}\end{array}$

Result of calculation is in table 9.

$\left|{s_i}^{\′}\right|=\left|\underset{k=2}{\overset{9}{\mathrm{\Σ}}}{x}_i^{0\′}\left(k\right)+\frac{1}{2}{x}_i^{0\′}\left(10\right)\right|,i=\mathrm{0,1,2,3}$

Result of calculation is in table 10.

$|{s_i}^{\′}-{s_0}^{\′}|=|\underset{k=2}{\overset{9}{\mathrm{\Σ}}}(x_i^{0\′}\left(k\right)-x_0^{0\′}\left(k\right))+\frac{1}{2}(x_i^{0\′}\left(10\right)-x_0^{0\′}\left(10\right))|;i=\mathrm{0,1,2,3}$

Result of calculation is in table 11, table 12.

$r_{0i}=\frac{1+\left|{s_0}^{\′}\right|+\left|{s_i}^{\′}\right|}{1+\left|{s_0}^{\′}\right|+\left|{s_i}^{\′}\right|+|{s_i}^{\′}-{s_0}^{\′}|},i=\mathrm{0,1,2,3}$

Result of calculation is in table 13.

(3) Synthesis Relational Grade of Grey is asked

Get θ=0.5, ρ _0i=θ ε _oi+ (1-θ) r _0i, i=0,1,2,3

Result of calculation is in table 14.

(4) Synthesis Relational Grade of Grey sequence

The degree of association is formed inteerelated order by the arrangement of descending order, reflects that the influence power of each sub-factor to female factor weakens successively, thus optimize optimal parameter.

Table 2 grey correlation analysis factor X _ivalue table

Table 3 result of calculation

Table 4|s _i| result of calculation

|s i|	|s 0|	|s 1|	|s 2|	|s 3|
					Result of calculation	16.75	8.65	76	0.16

Table 5 $X_i^0\left(k\right)-X_0^0\left(k\right)$ Result of calculation

Table 6|s _i-s ₀| result of calculation

|s i-s 0|	|s 0-s 0|	|s 1-s 0|	|s 2-s 0|	|s 3-s 0|
					Result of calculation	0	25.4	92.75	16.59

Table 7 grey absolute correlation degree ε _0iresult of calculation

ε 0i	ε 00	ε 01	ε 02	ε 03
					Result of calculation	1	0.509653	0.502681	0.51913

Table 8X _i' result of calculation

X i′	X i′(1)	X i′(2)	X i′(3)	X i′(4)	X i′(5)	X i′(6)	X i′(7)	X i′(8)	X i′(9)	X i′(10)
											X 0′	1	1.87	1.71	1.63	1.54	1.30	0.71	1.14	1.42	0.7
X 1′	1	0.86	0.71	0.43	0.71	0.86	0.71	0.86	0.43	0.91
											X 2′	1	1.60	1.50	1.02	1	0.50	0.70	0.50	1	0.6
X 3′	1	1.54	1.23	1.15	1.35	0.92	0.50	1	0.71	0.88

Table 9 result of calculation

Table 10|s _i' | result of calculation

|s i′|	|s 0′|	|s 1′|	|s 2′|	|s 3′|
					Result of calculation	3.184411	2.471429	0.38	0.333333

Table 12|s _i'-s ₀' | result of calculation

|S i′-s 0′|	|S O′-s 0′|	|S1′-s 0′|	|S 2′-S 0′|	|S 3′-s0′|
					Result of calculation	0	5.655839	3.564411	2.851077

Table 13 grey relative relationship degree r _0iresult of calculation

r 0i	r 00	r 01	r 02	r 03
					Result of calculation	1	0.540612	0.56151	0.613089

Table 14 Synthesis Relational Grade of Grey ρ _0iresult of calculation

ρ 0i	ρ 00(W)	ρ 01(S)	ρ 02(Δh 2)	ρ 03(K 1)
					Result of calculation	1	0.525132	0.532095	0.56611

As can be seen from Table 14, the correlation degree of each index and coal seam gas-bearing capacity W sorts and is: K ₁> Δ h ₂> S, for certain ore deposit, K ₁w is had the greatest impact.Therefore, further primary study W and K is needed ₁relation.

5.. estimate the index that coal seam gas-bearing capacity W is had the greatest impact further, simultaneously Simultaneous Determination coal seam gas-bearing capacity W.

For certain ore deposit, K ₁w is had the greatest impact, measures through the continuous synchronization of 30 days, obtain 30 groups of W and K ₁data, in table 15.

Simultaneous Determination tables of data under certain mine of table 15

Boring numbering	K 1(ml/g·min 0.5)	W(m 3/t)
			1#	0.54	7.63
2#	0.48	7.18
			3#	0.48	6.79
4#	0.53	7.76
			5#	0.52	7.66
6#	0.53	7.64
			7#	0.48	7.16
8#	0.47	6.72
			9#	0.46	6.82
10#	0.51	7.51
			11#	0.35	6.4
12#	0.35	5.45
			13#	0.38	5.42
14#	0.42	5.75
			15#	0.38	5.96

16#	0.22	2.47
			17#	0.19	2.96
18#	0.41	5.43
			19#	0.4	5.84
20#	0.33	4.59
			21#	0.64	9.2
22#	0.55	7.74
			23#	0.54	8.08
24#	0.51	7.23
			25#	0.52	7.39
26#	0.61	7.94
			27#	0.58	7.82
28#	0.62	9.12
			29#	0.62	8.89
30#	0.6	7.63

6.. regretional analysis is carried out to both determination datas above-mentioned, determines both mathematical models;

For certain ore deposit, according to table 15, regretional analysis W and K ₁relation, as shown in Figure 3.Can find out, with K ₁increase, W increases gradually, and both degrees of correlation are very high, coefficient R=0.9637.Founding mathematical models is as follows:

y＝8.23411+11.19943ln(x+0.41384) (1)

In formula, y is coal seam gas-bearing capacity W, m ³/ t; X is drilling cuttings desorption of mash gas index K ₁, ml/ (gmin ^0.5).

7.. for certain ore deposit, through type (1), can realize coal seam gas-bearing capacity down-hole Fast Measurement.

In the coal roadway tunneling process of about length 1000m, along with W and K ₁the accumulation of measured data, progressively can revise formula (1).

For other ore deposit, that have the greatest impact to W may be K ₁, also may be Δ h ₂or S.Therefore, need, first according to grey relation analysis method, to determine that the correlation degree of each index and W sorts, draw the index maximum with the W degree of association, then regretional analysis is carried out to the data of this index and W, determine both mathematical models, thus realize the down-hole Fast Measurement of coal seam gas-bearing capacity.

Claims (3)

1. a coal seam gas-bearing capacity down-hole rapid assay methods, its concrete steps are:

1.. in the boring of Driving Face in Coal Tunnel construction diameter 42mm, hole depth 14m;

2.. whole coal powder quantity of bore S that 1m measures this 1m section are often crept in boring, often creep into 2m and measure a K ₁with Δ h ₂value, and choose the final measured value of maximal value as this boring indices of measured data, wherein K ₁it is the desorption of mash gas amount of a coal sample every gram of coal sample in coal body disengaging exposure in an atmosphere the 1st minute; Δ h ₂for opening a certain sampling section from boring, the desorption of mash gas amount in the time period of 4th ~ 5 minutes after coal sample equalized pressure removal;

3.. when borehole drilling proceeds to 14m, adopt Direct Determination coal seam gas-bearing capacity W;

4.. use gray relation analysis method to determine S, K ₁or Δ h ₂with the correlation degree of coal seam gas-bearing capacity W, choose W as female factor, X ₀, S, Δ h ₂, K ₁respectively as sub-factor X ₁, X ₂, X ₃, carry out grey correlation analysis, concrete steps are as follows:

(1) grey absolute correlation degree ε is asked _0i, order

$X_i^0=\left(\begin{array}{ccccc}{x}_i\left(1\right)& x_i\left(1\right),x_i\left(2\right)& x_i\left(1\right),x_i\left(3\right)& x_i\left(1\right),x_i\left(4\right)& x_i\left(1\right))\end{array},=x_i^0\left(1\right),x_i^0\left(2\right),x_i^0\left(3\right),x_i^0\left(4\right)\right),$

$\left|s_i\right|=\left|\begin{array}{c}3\\ k=2\end{array}{x}_i^0(k+\frac{1}{2}{x}_i^0\left(4\right)\right|,$ $\left|\begin{array}{cc}{s}_i& s_0\end{array}\right|={|}_{k=2}^3\left(\begin{array}{cc}{x}_i^0\left(k\right)& x_0^0\left(k\right)\end{array}\right)+\frac{1}{2}\left(\begin{array}{cc}{x}_i^0\left(4\right)& x_0^0\left(4\right)\end{array}\right)|,$

$0i=\frac{1+\left|s_0\right|+\left|s_i\right|}{1+\left|s_0\right|+\left|s_i\right|+\left|\begin{array}{cc}{s}_i& s_0\end{array}\right|}(i=0~4)$

(2) grey relative relationship degree r is asked _0i, first obtain X _i( _i=0 ~ 4) initial value picture

${X^{\′}}_i=\frac{x_i\left(1\right)}{x_i\left(1\right)},\frac{x_i\left(2\right)}{x_i\left(1\right)},\frac{x_i\left(3\right)}{x_i\left(1\right)},\frac{x_i\left(4\right)}{x\left(1\right)}\underset{\÷}{\÷},$ $\left|{s^{\′}}_i\right|=\left|\begin{array}{c}3\\ k=2\end{array}{x}_i^{\′0}(k+\frac{1}{2}{x}_i^{\′0}\left(4\right)\right|$

$\left|\begin{array}{cc}{s^{\′}}_i& {s^{\′}}_0\end{array}\right|={|}_{k=2}^3\left(\begin{array}{cc}{x}_i^{\′0}\left(k\right)& x_0^{\′0}\left(k\right)\end{array}\right)+\frac{1}{2}\left(\begin{array}{cc}{x}_i^{\′0}\left(4\right)& x_0^{\′0}\left(4\right)\end{array}\right)|,$

$r_{0i}=\frac{1+\left|{s^{\′}}_0\right|+\left|{s^{\′}}_i\right|}{1+\left|{s^{\′}}_0\right|+\left|{s^{\′}}_i\right|+\left|\begin{array}{cc}{s^{\′}}_i& {s^{\′}}_0\end{array}\right|}(=_{i}0~4)$

(3) Synthesis Relational Grade of Grey ρ is asked _0i, get θ=0.5, ρ _0i=θ ε _0i+ (1-θ) r _0i(i=0 ~ 4)

(4) degree of association is formed inteerelated order by the arrangement of descending order, reflect that the influence power of each sub-factor to female factor weakens successively, thus optimize optimal parameter;

According to above-mentioned steps, calculate the Synthesis Relational Grade of each index, determine the index that coal seam gas-bearing capacity W is had the greatest impact;

5.. estimate the index that coal seam gas-bearing capacity W is had the greatest impact further, simultaneously Simultaneous Determination

Coal seam gas-bearing capacity W;

6.. regretional analysis is carried out to both determination datas above-mentioned, determines both mathematical models;

7.. realize coal seam gas-bearing capacity down-hole Fast Measurement.

2. a kind of coal seam gas-bearing capacity down-hole as claimed in claim 1 rapid assay methods, is characterized in that: step 1. in, when coal seam, front is nearly level, gently inclined seam workplace, at least should constructs 3 and hole; When coal seam is for inclination or high_dipping face, 2 borings of at least constructing.

3. a kind of coal seam gas-bearing capacity down-hole rapid assay methods as described in claim 1 and 2, it is characterized in that: boring should be arranged in soft layering as far as possible, a boring is positioned in the middle part of digging laneway section, and being parallel to tunneling direction, the whole hole point of other borings should be positioned at the outer 2 ~ 4m place of drift section both sides outline line.